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  • 1
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    Body-weight variations in four week old Clarias gariepinus (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23371 | 19325 | 2018-04-10 16:06:58 | 23371 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: The variation in size and weight of fry and fingerlings of Clarias gariepinus has been a major factor affecting the success of hatchery production of the species. It encourages cannibalism, thus reducing the overall survival. The disparity in weight and population was assessed to determine the necessity of sorting as a reliable method of controlling size disparity and mortality in hatchery production. Two-week-old fry with average weight of 15mg and length range of 0.8-0.9cm were randomly sampled and stocked at 200 fry/litre in 30 litre circular tanks. The fish were fed for four weeks on 45% crude protein diet, ad libitum. At the end of four weeks, there were three groups; large, medium and small with mean weight of 4.02g, 1.24g and 0.17g, respectively. The cumulative mean weight was 1.8g, population ratio was 1:8:10 for large, medium and small, respectively.
    Description: Includes:- 1 fig.;10 refs.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; freshwater environment ; Fingerlings ; Fry ; Weight ; Survival ; Induced breeding
    Repository Name: AquaDocs
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  • 2
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    Microbial load on smoked fish sold in Ibadan, Oyo State (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24208 | 19325 | 2018-05-19 06:39:34 | 24208 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The microbial load of four different fish species from five different market locations in Ibadan metropolis were determined using standard microbiological procedures. The bacteria count of fish sampled from Ojo market was the highest while the bacteria count of the fish sample from Bodija market was the lowest. There was no significant difference (p〈0.05) in the microbial load of the fish sampled from various market locations in Ibadan metropolis. Similarly, there was no significant difference (p〉0.05) in the microbial load on various fish species sold in Ibadan metropolis. The isolated bacteria from the study were: E. coli, Salmonella spp, Klebsiella spp, Staphylococcus aureus, Aerosomonas spp, Pseudomonas spp, Vibrio spp, Serratia spp, Chromobacterium spp, Enterobacteria spp and Shigella spp. The fungi count of fish sampled from Omi markets was the highest while the fungi count of the fish sampled from Ojo market was the lowest. The following fungi were however isolated from the study: Aspergillus flavus, Penicillium spp, Fusarium oxysporum, Trrichoderma spp and Ceotrichium albidium. The study shows that reheating may be necessary to destroy or inactivate micro-organisms in smoked fish before consumption.
    Description: Includes: 2 tables and 2 figures.;Also includes: 17 refernces.
    Keywords: Fisheries ; Nigeria ; Ibadan ; Bacteria ; Fungi ; Market ; Fish species ; freshwater environment ; Microbial contamination ; Microorganisms ; Bacteria ; Freshwater fish ; Cured products ; Sample contamination ; Fungi ; Public health ; Quality assurance ; Disinfection
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  • 3
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    Toxicity of unripe Ackee apple (Blighiasapida) fruit extract on Clarias gariepinus fingerlings (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24201 | 19325 | 2018-05-16 15:24:45 | 24201 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The study was conducted to determine the toxicity of unripe Ackee apple (Blighiasapida) fruit extract on catfish, Clarias gariepinus fingerlings using the 96-hour bioassay under laboratory condition. The LC50 was determined graphically as 3.00ppt. Mean mortality was 0, 40, 50, 70 and 80% in the concentrations of 0, 3.33, 3.47,3.60 and 3.73ppt. Statistical analysis of the results showed that there were significant differences (P〈0.05) on the effect of concentration. Mortality increased with increase in concentration of toxicant and duration of exposure. Clarias gariepinus showed erratic swimming pattern, loss of reflex which increased with increase in concentration. Histopathological changes were revealed in the gills, skin and heart of the fish. The gill structure was altered and there were moderate mucosal erosion. There were several lymphoid aggregations with fibrous connective tissue at the dermal and epidermal areas in the skin. The heart myofibre were diffusely disintegrated with edema between bundles.
    Description: Includes: 1 table and 7 plates.;Also includes: 8 references.
    Keywords: Health ; Aquaculture ; Clarias gariepinus ; Nigeria ; Ado-Ekiti ; Fruit Extract ; freshwater environment ; Toxicity ; Artificial feeding ; Food composition ; Chemical composition ; Histopathology ; Freshwater fish ; Fingerlings ; Toxicants ; Mortality ; Fish culture ; Controlled conditions ; Lethal limits
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  • 4
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    Growth performance of Clarias gariepinus fingerlings fed diets with graded levels of yeast (Saccharomyces cerevisiae) used as a floater additive in concrete tanks (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24159 | 19325 | 2018-05-13 13:04:38 | 24159 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Completely randomized design with duplicate groups were used to study the growth performance of 400 fingerlings of Clarias gariepinus in 2m x 2m x 1m concrete tanks in an out-door hatchery complex of National Institute for Freshwater Fisheries Research (NIFFR), New Bussa, Niger State, Nigeria. Graded levels (0, 1,2,3 or 4) % of yeast (Saccharomyces cerevisiae) was included into a 40% crude protein (C.P) NIFFR floating basal diet and fed to Clarias gariepinus in tanks for 16 weeks and 35% in the last 4 weeks. This was to determine the optimum level of supplemental yeast inclusion as a floater additive into diets of C. gariepinus and to quantify feed and its cost for raising a kilogram of the fish fed diets. The experiment was geared towards development of cost effective standard floating feed for Clarias gariepinus. There was no significant difference in weight gain (WG), feed consumed (FC), specific growth rate (SGR), survival, cost of feed consumed (CFC) and palatability test of flesh (P〉0.05) except FCR (P〈0.05) and feed cost per kilogram of fish (P〈0.05) at the end of 8 and 20 weeks. There was no histopathological defect observed on the fish and fish carcass. It was concluded that 2% or 1 % level of yeast can be included in NIFFR floating feed with the assurance of producing a kilogram of C. gariepinus with a feed of N300.00 under good management practices based on ingredient ruling price at the time of this study and this might be capable of increasing farmer's income in fish production.
    Description: Includes: 1 table and 2 figures.;Also includes: 21 references.
    Keywords: Aquaculture ; Ecology ; Clarias gariepinus ; Nigeria ; Niger ; Yeast ; Floating additives ; Performance ; Clarias gariepinus ; freshwater environment ; Growth rate ; Freshwater fish ; Fingerlings ; Artificial feeding ; Feeding experiments ; Feed ; Yeasts ; Additives ; Culture tanks ; Cost analysis ; Performance assessment ; Fish culture
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  • 5
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    Growth performance and nutrient utilization of post fingerlings Clarias gariepinus fed varied levels of biscuit waste (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24162 | 19325 | 2018-05-13 13:15:18 | 24162 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A feeding trial was conducted to determine the effect of biscuit waste meal on the growth performance and utilization of Clarias gariepinus juveniles. A total of 300 juveniles of average weight 8.85g were randomly divided into 5 Treatments, each with three replicates. Twenty juveniles were distributed into fifteen happas (0.7m3) and each happa was suspended to 3/4 of its volume using kuralon ropes carefully tied round the bamboo poles across the concrete tanks. Five diets containing 40% crude protein were formulated in which maize was replaced with biscuit waste meal at Treatment diet 1 (TD1) 0%, 25% (TD2), 50% (TD3), 75% (TD4), 100% (TD5) levels.The juveniles were fed at 3% body weight per day for 10 weeks. It was recorded at the end of the experiment that biscuit waste was most suitable as an energy supplement when incorporated at 25% replacement (TD2) with maize. TD1 had the highest weight gain followed by TD2, TD3, TD4 and TD5 respectively. There were no significant differences (P〉0.05) in the growth response in TD1 (0%), T0D (25%) and TD3 (50%). It is therefore concluded that biscuit waste meal is a cheap source of non conventional energy source which can be used favorably to replace maize (25% inclusion level) as an energy source in the diets of Clarias gariepinus.
    Description: Includes: 7 tables.;Also includes: 15 references.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Abeokuta ; Treatment ; Biscuit waste ; Net hapa ; Juvenile ; Crude protein ; freshwater environment ; Growth rate ; Nutrition ; Freshwater fish ; Fingerlings ; Diets ; Wastes ; Feed ; Feeding experiments ; Fish culture
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  • 6
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    The effects of dichlorvos (2, 2 - dichlorovinyl phosphate (DDVP)) induced stress on the growth of fingerlings of Clarias gariepinus (Burchell, 1822) (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24165 | 19325 | 2018-05-13 13:30:18 | 24165 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: This study was conducted to determine the effects of dichlorvos ~9 2, 2 - dichlorovinyl dimethyl phosphate (DDVP)~0 on the growth of Clarias gariepinus fingerlings. The experiment was conducted in two phases: the first phase involved the exposure of the fish to different concentrations ~9 0.00 (control), 0.4ppm, 0.5ppm, 0.6ppm, 0.7ppm, 0.8ppm, 0.9ppm, 1.0ppm, 1.1 ppm and 1.2ppm~0 of dichlorvos for four days. The second phase was a recovery process in which the fish that survived from the first phase were introduced into clean, dechlorinated, toxicant-free water and were fed at 3% of their body weight for 12 weeks. The change in weight was measured every fortnight and the feed fed was adjusted to accommodate the change in weight. The highest values for weight gain, percentage weight gain, specific growth rate and average daily weight gain occurred in the control and these values were significantly (p〈0.05) higher than the values of these parameters recorded in the other treatments. The range of values of weight gain, percentage weight gain, specific growth rate and average daily weight gain are 6.76 ~c 3.01-18.45 ~c 8.90g, 69.45 ~c 18.52 - 105.52 ~c 33.67%, 1.54 ~c 0.33 - 2.08 ~c 0.46%/day and 0.48 ~c 0.21 - 1.21 ~c 0.65g respectively. Based on the results of this study, the exposure of fingerlings of Clarias gariepinus to dichlorvos ~9 2, 2- dichlorovinyl dimethyl phosphate (DDVP)~0 affected the growth of the fish. Therefore, the use of dichlorvos on stored grains should be regulated because uncontrolled usage could cause mortality and impairment of growth in fish if the pesticide gets washed into water bodies inhabited by fish.
    Description: Includes: 1 table.;Also includes: 9 references.
    Keywords: Aquaculture ; Ecology ; Pollution ; Clarias gariepinus ; Nigeria ; Lagos State ; Toxicity ; Pesticide ; Clarias gariepinus ; Growth performance ; freshwater environment ; Freshwater fish ; Fingerlings ; Toxicants ; Pesticides ; Toxicity ; Bioaccumulation ; Feeding ; Growth rate ; Pollution effects
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  • 7
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    Vitamin A requirements of Heterobranchus longifilis fingerlings (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24090 | 19325 | 2018-05-12 14:35:57 | 24090 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The growth response of Heterobranchus longifilis fingerlings (0.86~c0.07g) to supplementation of graded levels of vitamin A (0, 500, 1000, 1500 or 2000 mg/kg; Bio-Organics Nutrient System Limited, Lagos) into a 42.5% crude protein basal diet was investigated. Completely randomized design with triplicates was used in a mini flow through system after 2 weeks acclimatization for 20 weeks in New Bussa, Niger State, Nigeria. There was significant difference (P〉0.05) in feed intake, weight gain and survival between fish fed control diet (Omg vitamin A kg-1 diet) and the supplemented groups. The significantly (P〈0. 05) poorest feed conversion ratio, protein conversion ratio and specific growth rate were recorded in the group fed 2000 mg vitamin A kg-1 diet. However, whole body vitamin A concentration was significantly (P〈0.05) higher in the supplemented groups than the control but no significant different (P〉0.05) between supplemented groups. It was concluded that a diet containing adequate amount of macro and micro-nutrients with good lipid source will be able to provide vitamin A that can favour good growth in H. longifilis fingerlings. There is need to determine the response of the fish to vitamin A supplementation in an outdoor environment as vitamin A is required for the regeneration of light-sensitive compound rhodopsin.
    Description: Includes: 3 tables and 1 figure;Also includes: 13 refs.
    Keywords: Aquaculture ; Heterobranchus longifilis ; Nigeria ; Heterobranchus longifilis ; Vitamin A ; Growth response ; freshwater environment ; Vitamins ; Growth ; Nutrients (mineral) ; Feed composition ; Fish ; Fingerlings ; Feeding experiments ; Aquaculture
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  • 8
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    Incidence of parasitic infestation on the skin and gills of Clarias gariepinus (Burchell) reared under different culture systems (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24091 | 19325 | 2018-05-12 14:38:25 | 24091 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A total of 140 fish samples of Clarias gariepinus comprising of 20 fry from two hatcheries, 60 fingerlings and 60 adults reared under the water recirculating, water flow-through and the earthen pond culture systems, were clinically examined for presence of ecto-parasites on the skin and the gills. The ectoparasitic fauna observed comprises of 3 protozoans including Trichodina sp, Costia sp and Epistilis sp, and 4 metazoans of which 3 are monogenetic trematodes including Gyrodactylus sp, Dactylogyrus sp and Cleidodiscus sp. The fourth metazoan is a leech; Piscicola sp. Infestation due to Trichodina sp and the monogenetic trematodes were observed in all developmental stages of C. gariepinus and under all the culture systems studied. The highest incidence rate of 100% Trichodina sp infestation was observed on both the skin and the gills of the fingerling stage. The highest parasitic load of 10 organisms per field was also observed on the skin of the fingerlings reared in the earthen pond. Infestation due to monogenetic trematodes was observed to be highest (70%) on the skin of fingerlings reared under the water flow through system, while in the earthen pond system, the incidence rate of 60% was observed for both the fingerlings and the adult fish. Costia sp was observed in all the 3 culture, s;ystems, with the highest incidence of 50% and parasitic load of 2. 5 organisms per field recorded on both the fry and the skin of the fingerlings reared in earthen pond. The incidence of Epistilis sp infestation on the gills of catfish fingerlings reared in the water recirculating system was observed to be low (5%), while Piscicola sp infestation was observed only on the skin of adult C. gariepinus at an incidence rate of 35%, but with a high worm burden of 15 organisms per fish. The fingerlings seem to be more susceptible to Trichodina sp and the monogenetic trematodes, especially under the earthen pond culture system. Catfish hatcheries, especially those producing fingerlings in the earthen ponds must ensure adequate and efficient hygiene practices. They may also need to disinfect their stock appropriately at harvest, prior to distribution to farmers to avoid spread of para sites.
    Description: Includes: 6 tables and 6 figures;Also includes: 45 refs.
    Keywords: Aquaculture ; Clarias gariepinus ; Heterobranchus longifilis ; Heterobranchus bidorsalis ; Nigeria ; freshwater environment ; Fish ; Parasites ; Infestation ; Skin ; Gills ; Fish culture ; Recirculating systems ; Fish ponds ; Fingerlings
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  • 9
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    Microbial occurrence on differently preserved tilapia fish in Abeokuta North Local Government, Nigeria (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24094 | 19325 | 2018-05-16 13:01:01 | 24094 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: This study reports the microbial flora of differently processed tilapia fish obtained from Olomoore market, Abeokuta, Nigeria. Samples were purchased, differently processed (using smoking, salting, freezing) and analyzed for the presence of bacteria. Microbial loads and characterisation were examined on the gills and the skin using standard microbiological procedures. The progression of growth was also monitored within I0-day storage period for the differently processed fish. 〈i〉Proteus vulgaris, Leuconostoc meseritiroides, Klebsiella planticola〈/i〉, Pseudomonas spp, 〈i〉Staphylococcus aureus, Bacillus subtitles〈/i〉, Enterobacter spp, 〈i〉Proteus vulgaris〈/i〉, Lactobacillus spp. were the bacteria isolated from the differently processed fish. There was no significant difference (P~B 0. 05) in the bacteria load of the gill during the first day of processing. However, significant variation (P~B 0. 05) existed in the bacteria load of the skin of the fish during the first day of processing. Although no significant difference (P~B 0. 05) was recorded in the bacteria load of the gill and the skin of the fish during the first day of processing in nutrient agar medium. In the tenth day frozen fish gill had the highest bacteria load while smoked fish gill had the lowest bacteria load there was significant difference (P~B 0. 05) in the bacteria load on the gill of differently processed fish gill. Similarly, there was significant variation (P~0.05) in the bacteria load of the skin of the fish during the tenth day processing.
    Description: Includes: 3 tables;Also includes: 29 refs.
    Keywords: Fisheries ; Proteus vulgaris ; Leuconostoc meseritiroides ; Klebsiella planticola ; Staphylocoooccus aureus ; Bacillus subtilis ; Nigeria ; Bacteria ; Microbial ; Occurrence ; Tilapia ; Smoking ; Salting ; Boiling ; freshwater environment ; Microorganisms ; Fishery products ; Processing fishery products ; Fish ; Gills ; Fish diseases ; Skin ; Bacterial diseases ; Pathogens
    Repository Name: AquaDocs
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    Format: 179-185
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  • 10
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    The effects of light and dark exposure on growth response of Clarias gariepinus fingerlings reared in glass aquaria (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24101 | 19325 | 2018-05-16 13:24:18 | 24101 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The study was carried out to determine the effect of light and dark exposures on the growth response of Clarias gariepinus fingerlings. A total of 120 four-week old Clarias gariepinus fingerlings (mean weight 0.52g~c0.02) were stocked into 20 litres of bore-hole water in glass aquarium (60x30x30) cm. Complete light, dark and normal photo periods were the experimental conditions evaluated. Growth indices such as mean weight gain and mean increase in standard lengths were significantly (p〈0. 05) highest in the dark exposure with the following values respectively: (4.19 ~c 0.02g) and (4.11 ~c 0.19cm). Also, percentage survival (82.5%) in the dark exposure was higher than light and control (45% and 70% respectively). Light exposure had higher cannibalism rate (42.5%) than the dark and control (0% and 5 % respectively). Deep shiny black skin colouration was observed among the fingerlings in the dark exposure, while those in the light and control experimental conditions exhibited lighter and normal skin colourations respectively. The experimental conditions were not influenced by the water quality parameters (mean pH: 8~c 0.1 and temp: 28.1 ~c 0.60 ~'C) since their values were within the tolerable limit for fish culture throughout the 42 days experimental period.
    Description: Includes: 4 tables;Also includes: 10 refs.
    Keywords: Aquaculture ; Ecology ; Clarias gariepinus ; Nigeria ; Maiduguri ; freshwater environment ; Fish ; Growth ; Photoperiodicity ; Experimental culture ; Fingerlings ; Cannibalism ; Survival ; Light attenuation ; Fish culture
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  • 11
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    The effect of feeding regime and rate on the growth of Clarias gariepinus (Burchell, 1822) fingerlings fed with artificial feed (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24163 | 19325 | 2018-05-26 12:00:29 | 24163 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Fish growth is a function of adequate supply of feed in the right quantity and time. The effect of feeding rate on the growth of Clarias gariepinus (Burchell, 1822) was studied for a period of 22 weeks. The fish were fed at the same percentage body weight throughout the study period and a bi-weekly weight gain was measured. Water quality parameters were also monitored. There was a significant increase in weight gain in daily feeding regime than in the ones in two days feeding regime. The increase in weight for the daily feeding regime was visible as from the 8th week while that for the ones in two days feeding was only significantly different in 22nd week at 0.05 level of significance. The relationship between the two feeding regime types also revealed that the daily feeding performed better than the ones in two days feeding regime.
    Description: Includes: 2 tables.;Also includes: 10 references.
    Keywords: Aquaculture ; Pollution ; Ecology ; Clarias gariepinus ; Nigeria ; Niger ; Feed ; Fish growth ; Feeding regime and weight gain ; freshwater environment ; Feeding ; Growth rate ; Freshwater fish ; Fingerlings ; Length-weight relationships ; Water quality ; Fish culture
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  • 12
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    Isolation, identification and characterization of Lactobacillus species from fermented locust bean (Parkia biglobosa) for use as probiotics in the aquaculture industry (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24166 | 19325 | 2018-05-13 18:40:22 | 24166 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Probiotics are a promising feed additive to stimulate animal growth and secure a low disease response in aquaculture industry where there are high stocking densities in shrimp and fish production. Fermented locust beans (Parkia biglobosa) are known to be rich in protein and used as food condiment. Probiotic bacteria were isolated from this locally available food material. Culture and characterizations of isolates were carried out. Sugar fermentation patterns were determined by using an API 50 CHL system and incubation were performed anaerobically at 37~'C. MRS broth culture grown at 37~'C overnight was added to 9ml of MRS Agar and the bacteria were incubated at 37~'C for 24 and 48 hrs. Discrete and single colony of lactobacillus was isolated using colony morphology and biochemical tests. The most significant viable taxa isolated was Lactobacillus fermentum at a pH range of (3.0-8.0), while the least viable taxa isolated was Leuconostoc mesenteroides ssp. Microscopically they were Grampositive, rod shaped, non- motile, catalase negative and absence of Endospore.
    Description: Includes: 2 tables and 2 plates.;Also includes: 15 references.
    Keywords: Aquaculture ; Nigeria ; Lagos ; Locust bean ; Probiotics ; Lactobacillus ; Probiotics ; freshwater environment ; Feed ; Additives ; Aquaculture ; Microorganisms ; Bacteria ; Disease resistance ; Fermented products ; Fish culture ; Shrimp culture
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  • 13
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    Food borne bacterial pathogens in smoke-dried fish in Lagos markets (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23395 | 19325 | 2018-04-12 07:17:16 | 23395 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Fifty samples of smoked fish were obtained from some markets in Lagos and these were analyzed for the presence of Staphylococcus aureus, Vibrio sp. and Listeria monocytogenes. All the samples tested positive for Staphylococcus aureus, 27 samples for Vibrio sp. and none for Listeria monocytogenes. This study reveals that the smoked fish sold in Lagos, could be a potential source of food borne bacterial pathogens and thus the need for improvement in processing and handling are required.
    Description: Includes:- 1 table.;17 refs.
    Keywords: Fisheries ; Health ; Nigeria ; Lagos ; freshwater environment ; Bacteria ; Pathogenic bacteria ; Cured products ; Processing fishery products
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  • 14
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    Bacteria organisms in grow out Clarias gariepinus mortality in Jos Area (2021)
    FISON | Akure (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23402 | 19325 | 2018-04-12 08:52:38 | 23402 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: The investigation of bacteria in grow-out catfish was carried out from February to June, 2008. 100 dead Clarias gariepinus were collected from ten ponds (A-J) distributed in Jos and its environs. Results from the various ponds showed that Escherichia coli were present in all the location found, while 87.0% of the total samples obtained were positive with bacteria isolates. The isolates were shown to include Aeromonas species (11.5%), Escherichia coli (35.6%), Pseudomonas aeruginosa (15.0%), Streptococcus faecalis (13.8%) and Klebsiella aerogenes (18.4%) of which pond F had 16.1 % of bacteria organisms while ponds B, G and H were both 9.2%, respectively.
    Description: Includes:- 4 tables.;9 refs.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Jos ; freshwater environment ; Bacteria ; Pathogenic bacteria ; Mortality
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  • 15
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    Classification of the pelagic and benthic compartments of Kainji ecosystem using types and loads of the bacterial flora (2021)
    FISON | Badagry, Lagos, Nigeria
    In:  http://aquaticcommons.org/id/eprint/23413 | 19325 | 2018-04-09 17:32:43 | 23413 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Pathogens in aquatic environment constitute health hazards to the aquatic lives (e.g. fish) and by extension man that drinks the water and also eat fish that is caught from such polluted aquatic environment. In this study, pelagic and benthic compartments of Kainji Lake were classified using types and loads of bacterial flora. Quantitative analysis of total heterotrophic count (THC) in pelagic samples showed that THC ranges from 2.0 x 101CFU/ml at Mataki to 3.6 x 106 CFU/ml at Musawa. Pelagic sample from Yauri market showed high bacterial count (3.5 x 106 CFU/ml). Total coliform count (TCC) at Yauri market and Musawa were also very high (3.0 x 104 CFU/ml and 2.1 x 105 CFU/ml respectively. Total heterotrophic count from benthic samples ranges from 4.2 x 102 CFU/g at Kasabo to 3.3 x 107 CFU/g at Yauri market and total coliform count ranges from 1.2 x 101 CFU/g at Garafini island to 3.3 x 103 CFU/g at Yauri market. Total coliform count from the benthic sample was generally lower than that from pelagic samples. Qualitative analysis revealed the presence of Salmonella typhi, Escherichia coli, Aeromonas hydrophila, Vibrio cholera from pelagic samples.
    Description: Includes:- 2 tables.;9 refs.
    Keywords: Biology ; Ecology ; Nigeria ; Kainji L. ; freshwater environment ; Benthos ; Pelagic fisheries ; Bacteria ; Microbiology
    Repository Name: AquaDocs
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  • 16
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    The anaesthetic effects of clove seed in selected species of grey mullets, Liza falcipinnis and Liza grandisquamis (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24225 | 19325 | 2018-05-19 07:13:31 | 24225 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The anaesthetic effects of Clove Seed extract in two species of grey mullets Liza falcipinnis and Liza grandisquamis were assessed. A total of 120 of these species comprising 60 L. falcipinnis with 30 each of fingerlings (mean length 9.86cm ~c l.ll SD: mean weight 21.20g ~c 2.10 SD) and juveniles (mean length 17.24cm ~c l.88 SD; mean weight 66.24g ~c 4.24SD) and 60 L. grandisquamis also consists of 30 each of fingerlings (mean length 10.24cm ~c 1.92 SD; mean weight 23.41 ~c 2.21 SD) and juveniles (mean length 18.21cm ~c SD; mean weight 71.21g ~c 4.12 SD) were Sampled from the recruitment ponds at African Regional Aquaculture Center, (ARAC), Buguma, Rivers State and were exposed to clove seed extracts at different concentrations of 0.0mglL (control), 5.0, 10.0, 15.0, 20.0 and 25.0mglL. The results obtained indicated a size related response to Clove seed extracts. The induction time in both species were found to decreased significantly (P〈0.05) as the concentrations of the clove extracts increased with the shortest induction time 55.61(s) observed in fingerlings of L. grandisquamis, while the longest 210.61(s) was recorded in juveniles of L. falcipinnis. However, the recovery time increased significantly with increasing concentration of the clove seed, with the highest recovery time 350.11(s) observed in L. falcipinnis at 25.0mglL concentration and the lowest 246.91(s) in L. grandisquamis at 5.0mglL concentration of the clove extracts, with the optimum dosage of 10.0mg/l and 15.0mg/l of fingerlings and juvenile sizes respectively. Interestingly, the survival of the exposed fish during the trial was 100% in both sizes of the two species. No mortality was recorded in all concentrations of the plant extracts. The findings of this trials indicated that clove seed extracts was effective, producing minimum stress and zero mortalities and therefore can be recommended as an effective anaesthetic for use in aquaculture.
    Description: Includes: 27 references.
    Keywords: Aquaculture ; Liza falcipinnis ; Liza grandisquamis ; Nigeria ; Rivers State ; Anaesthetic ; Clove ; Seed mullets ; aquaculture ; brackishwater environment ; Anaesthetics ; Seeds ; Brackishwater fish ; Juveniles ; Fish ponds ; Recruitment ; Size ; Comparative studies ; Aquaculture techniques ; Fish ; Biological stress ; Fingerlings ; Fish culture
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  • 17
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    Toxicity of oil-based drilling mud (OBM) on the survival of the fingerlings of Niger Delta mudskipper, Periophthalmus papilio (Boch and Schneider, 1801) (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24221 | 19325 | 2018-05-19 07:04:22 | 24221 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The toxicity of oil - based drilling mud on the survival of the fingerlings of Niger Delta mudskipper, Periophthalmus papilio were studied using static plastic tanks. The exposure period lasted for 96 hours. Lethal concentration (LC50) and lethal time (LT50) were determined. The control tanks contained no oil- based drilling mud. Results revealed increased in mortality values of the fish to all lethal concentrations. There was no mortality observed in the control tank. The oil- based drilling mud were toxic on Periopthalmus papilio.
    Description: Includes: 13 references.
    Keywords: Fisheries ; Pollution ; Periophthalmus papilio ; Nigeria ; Rumuche River ; Drilling fluid ; Mortality ; Lethal concentration (LCsub50/sub) ; Bioassay ; freshwater environment ; Toxicity ; Drilling platforms ; Drilling ; Mud ; Fingerlings ; Freshwater fish ; Survival ; Pollution effects ; Mortality ; Lethal effects ; Drilling fluids ; Experimental research ; Toxicity tests
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  • 18
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    Microbiological status of water and fish samples from Jabi Lake, Abuja (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24224 | 19325 | 2018-05-19 07:11:26 | 24224 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Jabi Lake is a natural water body in Abuja Federal Capital Territory (FCT). It was expanded for commercial fishing following relocation of Nigeria's headquarters to Abuja in 1993. Quantitative analysis of microbiological status of water and fish from the Lake was carried out. Samples were collected from the dam site, open water, middle lake and inlet. Result reveal that total coliform count which are indicators of pollution are high (2.0 x 103 cfu/ml, 1.1 x 103 cfu/ml, 1.0 x 103 cfu/ml and 1.1 x 103 cfu/ml for dam site, open water, middle lake, and inlet respectively). Total viable count too is high (9.2 x 103 cfu/ml, 4.9 x 103 cfu/ml, 4.6 x 103 cfu/ml and 4.9 x 103 cfu/ml for dam site, open water, middle lake and inlet respectively). There are no coliform bacteria in the muscle of the fish. High bacterial load is an indication of biological pollution and these calls for restraint on the side of those who are using the lake as site for refuse dump.
    Description: Includes: 10 references.
    Keywords: Fisheries ; Pollution ; Nigeria ; Jabi Lake ; Jabi lake ; Water ; Fish ; Bacteria ; freshwater environment ; Microbiology ; Fish ; Pollution ; Water pollution ; Lake fisheries ; Fishery surveys ; Bacteria ; Baseline studies ; Water sampling ; Microbial contamination ; Muscles ; Freshwater fish ; Pollution surveys ; Water analysis ; Freshwater pollution
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  • 19
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    Association of Aeromonas hydrophila with mortality of catfish (Clarias gariepinus) (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24245 | 19325 | 2018-05-20 05:42:58 | 24245 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Aeromonas hydrophila was the predominant bacteria isolated from moribund fingerlings, post fingerlings, juveniles and table size of Catfish (Clarias gariepinus) cultured in concrete tanks. A. hydrophila was recovered from the internal organs of the fish showing varying degrees of clinical signs of dropsy, ulcers, fin rot and tail rot. The study considers the role of A.hydrophila, a pathogen of emerging importance and its presence in fish as a cause for concern for culturists, processors, consumers and exporters.
    Description: Includes: 17 references.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Port Harcourt ; brackishwater environment ; freshwater environment ; Pathogens ; Pathogenic bacteria ; Freshwater fish ; Fingerlings ; Fish culture ; Fish diseases ; Atmospheric physics
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  • 20
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    Effects of chicken manure to fingerlings of Nile tilapia (Oreochromis niloticus) (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24210 | 19325 | 2018-05-19 06:43:04 | 24210 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The effect of acute toxicity of chicken droppings to fingerlings of Oreochromis niloticus was determined under laboratory conditions using static bioassay for a period of 96 hours. The 96-hrs LC50 was estimated to be 2.19 with upper and lower confident limits of 3.24 and 1.48g/l. Water quality examination revealed a reduction in the level of dissolved oxygen, increase in alkalinity and free carbon dioxide with increase in concentrations of the fertilizer while there were no significant different (P〉0.05) in the ievels of pH and temperature when compared with the control. Fish exposed to higher concentrations of the organic fertilizer became darker in colour with mucous secretion, exhibited erratic swimming and showed signs of respiratory distress before death. Methods and standard doses for subsequent organic fertilizer application in fish ponds for survival and growth are discussed.
    Description: Includes: 2 tables.;Also includes: 24 references.
    Keywords: Pollution ; Aquaculture ; Oreochromis niloticus ; Nigeria ; Abuja ; Organic fertilizer ; Acute toxicity ; Oreochromis niloticus ; Water quality ; freshwater environment ; Manure ; Organic fertilizers ; Fingerlings ; Freshwater fish ; Toxicity ; Water quality ; Inspection ; Dissolved oxygen ; Alkalinity ; Carbon dioxide ; Fish ponds ; Survival ; Growth ; Pollution effects ; Bioassays ; Controlled conditions ; Lethal limits ; Fish culture
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  • 21
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    Bacteriological assessment of smoked fish (Clarias Sp.) around Shiroro Lake area of Niger State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24185 | 19325 | 2018-05-16 14:41:02 | 24185 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Bacteria has been implicated in food poisoning, and smoked fish is not an exception.Generally, fish is highly susceptible to spoilage; therefore this study evaluated the bacteria load in smoked fish from three major locations in Shiroro area of Niger State namely; Gwada, Kuta and Zumba.The smoked fish samples collected from these locations were smeared at both the gills and head regions of the fishes. The bacteria samples identified were Escherichia coli, Bacillus subtilis, Staphylococcus aureus, Staphylococcus epidermis, Pseudomonas aeruginosa, and Samonella typhi, which were common to all the three locations sampled, while only Streptococcus feacaliswas only was found to be present in both Kuta and Zumba location.The frequency of occurrence of these 68 bacteria samples isolated ranges from 8 - 20%, with Bacillius subtilis having the highest occurrence and Pseudomonas aeruginosa have the least occurrence. Out of the total 68 samples, 14 skin samples (20.6%) and 5 gills samples (7.4%) exceeded the acceptable limits of total mesophilic aerobic counts which were 10〈sup〉6〈/sup〉 - 10〈sup〉7〈/sup〉 cfu/g. In the case of total coliform counts, 12 skin samples (17.6%) and 7 gills samples (10.3%) exceeded the acceptable limit which is 4.0 x 102, while in the case of Staphylococcus aureus, 4 skin samples (5.9%) and 2 gills samples (2.9%) exceeded the acceptable limit which is 103 cfu/g. Similarly 3 skin samples (4.4%) and 1 gill sample (1.5%) exceeded the acceptable limit of Salmonella typhi which is 104 cfu/g.
    Description: Includes: 4 tables.;Also includes: 21 references.
    Keywords: Fisheries ; Health ; Escherichia coli ; Bacillus subtilis ; Staphylococcus aureus ; Staphylococcus epidermis ; Pseeudomonas aeruginosa ; Nigeria ; Shiroro L. ; Bacteria ; Smoked (Clarias spp) fish ; Location and recommended values ; brackishwater environment ; freshwater environment ; marine environment ; Bacteria ; Food poisoning ; Cured products ; Fish ; Fish spoilage ; Acceptability ; Lake fisheries ; Gills ; Brain ; Evaluation
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  • 22
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    Growth enhancement potential of Mucuna pruriens utilis on the Nile tilapia, Oreochromis niloticus (L.) (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24238 | 19325 | 2018-05-20 05:25:21 | 24238 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The growth enhancement potential of Mucuna pruriens utilis on the Nile Tilapia, Oreochromis niloticus (L.), was investigated in eight weeks feeding trials in concrete tanks at the African Regional Aquaculture Centre, Aluu. Three isonitrogenous diets were fed to three sets of fingerlings of the fish with full fat soya bean diet(D1) serving as the Control. The initial average fish weight was 1.45 ~c 0.12 and the final average fish weight was 5.67 ~c 1.46. Crude protein, ash and nitrogen free extract of the carcasses were significantly different (P〉0.05) from the control specimens. The average weight gains were 3.85g, 3.54g and 3.42g for fish fed 'full fat' Soya bean based diet(Control), fermented Mucuna seed diet(D2) and unfermented Mucuna seed diets (D3) respectively. Average apparent food consumed was in the order D2 〉D1 〉 D3. Fish fed fermented Mucuna seed diet (D2) had the highest food conversion ratio of 1.51 followed by fish fed with the control diet (D1) 1.22 and fish fed unfermented Mucuna seed diets (D3) 1.19. Unfermented Mucuna seed diet had the highest food conversion efficiency (0.84) followed by full fat Soya bean based diet(Control) 0.82 and the least was the fermented Mucuna seed diet (0.66). The results of this study indicate that unfermented Mucuna diet can conveniently replace Soya bean based diet without significantly affecting growth.
    Keywords: Aquaculture ; Ecology ; Oreochromis niloticus ; Nigeria ; Port Harcourt ; Feeding potentials ; Processing ; Concrete tanks ; Weight gained ; freshwater environment ; Freshwater fish ; Growth ; Feeding experiments ; Food conversion ; Fish culture ; Fingerlings ; Culture tanks ; Diets ; Body weight
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  • 23
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    Acute toxicity of industrial effluents from Agbara environs of Ologe Lagoon on early life stages of African catfish Clarias gariepinus (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24217 | 19325 | 2018-05-19 06:56:50 | 24217 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The acute toxic effect of industrial effluents from Agbara Industrial environs of Ologe lagoon was investigated in a static renewable lethal bioassay using fingerlings and Juveniles of African catfish (Clarias gariepinus). Twenty (20) pieces of the fingerlings were stocked per tank and each treatment was in triplicate. Physico-chemical parameters: temperature, pH, Dissolved Oxygen, DO and conductivity in treatment tanks were monitored for 96 hours. Behavioural responses were studied; mortality data recorded, and histopathological analysis was also done. Except for dissolved oxygen, other physico-chemical parameters monitored did not show significant differences (p〉0.05). The lethal bioassay showed that as the concentration of effluent increased, more mortality was recorded; but as the time of exposure increased, mortality reduced. The LC50 obtained at all the different time intervals for C. gariepinus fingerlings in 24,48, 72 and 96 hrs were: 69.45,46.39, 40.81 and 34.03(%). While in juveniles, the values were: 64.52,49.21, 32.50, and 19.63(%) respectively. Abnormal behaviour was observed; they showed repeated darting movement within an hour of introduction, darkening in the eye and on the skin, haemorrhage in the gills, spiral swimming and death. Histopathological examination of the gills and liver of the fishes showed lesions which increased progressively with increasing level of toxicants. Observed changes in the gills were mainly: epithelial lifting, swollen lamellae, necrosis and mass degeneration, fatty and vacuolar degeneration, loss of lamellae and marked disorganization in gill structure and arrangement. In the liver, there were vacoulation, portal congestions, pancreatic necrosis, fatty degeneration and severe disruption of the hepatic cord. Fishes in the control treatments showed no visible lesions throughout the experiments. This information confirms that histopathological alterations are good biomarkers for toxic impact assessment of industrial effluent on fish. Therefore, an indiscriminate discharge of this effluent to surrounding water should be discouraged.
    Description: Includes: 33 references.
    Keywords: Fisheries ; Pollution ; Clarias gariepinus ; Nigeria ; Ologe Lagoon ; Acute ; Toxicity ; Industrial effluence ; Ologe lagoon ; brackishwater environment ; Toxicity ; Industrial wastes ; Lagoons ; Brackishwater fish ; Juveniles ; Fingerlings ; Physicochemical properties ; Histopathology ; Pollution effects ; Mortality ; Brackishwater pollution
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  • 24
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    Microbiological quality of fresh tilapia raised in ponds fertilized with raw and sterilized cow dung manures (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24222 | 19325 | 2018-05-19 07:06:04 | 24222 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A total of 2,800 tilapia (Oreochromis niloticus) were stocked in seven duplicates 5 by 4 m2 earthen ponds in NIFFR Integrated Farm, New-Bussa, Niger-State. Raw and sterilized poultry manure of 0.13 to 0.52 kg/m3 concentrations were used to fertilize the ponds with the unfertilized ponds serving as control. The following bacteria were isolated from the cow dung manure; Escherichia coli, E. co1iOl57:H7, Aeromonas hydrophila,Salmonella typhi, Shigella dysenteriae and Staphylococcus aureus. The fish samples from the 0.13 and 0.26 kg/m3 sterilized manure fertilized ponds had zero count in the muscles while samples from other ponds had pathogens in their fish muscles. The study revealed that fish samples from sterilized manures were better in terms of microbial safety for fish productions hence sterilized manure are recommended for use in fish production to ensure the microbial safety of the fish, handlers and that of the consumers.
    Description: includes: 13 references.
    Keywords: Aquaculture ; Oreochromis niloticus ; Escherichia coli ; Aeromonas hydrophila ; Samonela typhi ; Shigella dysenteriae ; Staphylococcus aureus ; Nigeria ; Niger State ; Catfish ; Pathogens ; Microbial quality ; Raw and sterilized manue ; freshwater environment ; Bacteria ; Freshwater fish ; Fish culture ; Fish ponds ; Manure ; Microorganisms ; Freshwater aquaculture ; Aquaculture products ; Food fish ; Quality assurance ; Muscles ; Microbial contamination
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  • 25
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    Detection of Listeria monocytogenes in frozen fish in Lagos, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24229 | 19325 | 2018-05-19 07:20:47 | 24229 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The objective of this study was to detect Listeria monocytogenes in frozen fish in Lagos, Nigeria. A total of 55 frozen fish from two markets (Iyana-Ipaja and Mushin) were analyzed for the presence of L. monocytogenes using Oxoid Listeria Precis method. Out of the 55 samples analyzed, only 15 were positive for L. monocytogenes. The study showed that L. monocytogenes is a contaminant of frozen fish and may pose serious health implications on consumption of the contaminated fish.
    Description: Includes: 20 references.
    Keywords: Fisheries ; Health ; Listeria monocytogenes ; Nigeria ; Lagos ; Listeria monocytogenes ; Frozen fish ; Oxoid Listeria Precis ; freshwater environment ; Frozen products ; Fish ; Public health ; Bacteria ; Samples ; Fishery products ; Microbial contamination ; Quality assurance
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  • 26
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    Comparative study of bacterial isolates associated with the skin of catfish (Clarias anguillaris and Heterobranchus bidorsalis) in Kainji Lake area (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24596 | 19325 | 2018-05-20 16:13:09 | 24596 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Sixty apparently healthy Heterobranchus bidorsalis and Clarias anguillaris from NIFFR were cultured and 30 each from Monai and wara villages as wild environments were obtained for the studies. The total bacterial load varied from 2.2 x l05 to 1.08 x l08 and 2.27 x 105 to 6.3 x l08 CFU/g of the skin of C. anguillaris and H.bidorsalis in the culture respectively, while the load varied from 1.77 x 105 to 1.17 x l08 and 2.27 x 105 to 9.0 x l07 CFU/g in the wild respectively. Eleven bacterial general species were identified which include: Bacillus species B.firmus, Pseudomonas species, P. aeruginosa, Escherichia coli, Klebsiella aerogenes, K. ozaenae, Staphylococcus aureus, Streptococcus species, S.faecalis, and Aeromonas species. The aims of this investigation is to compare the type and the load of bacteria isolates on the skin of catfish in both culture and wild environment.
    Description: Includes: 7 references.
    Keywords: Aquaculture ; Fisheries ; Clarias anguillaris ; Heterobranchus bidorsalis ; Nigeria ; Kainji L. ; Comparative study ; Bacteria ; Skin ; Clarias ; Heterobranchus ; Kainji Lake ; freshwater environment ; automation
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  • 27
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    Comparative growth response of African catfish, Clarias gariepinus fingerlings fed with imported and local feeds (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24153 | 19325 | 2018-05-12 14:51:36 | 24153 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The comparative growth response of African catfish fingerlings (Clarias gariepinus) fed with three (3) local and three (3) imported feeds was studied in the Department of Biological Sciences, Ahmadu Bello University, Zaria between September and October, 2009 with the aim of establishing the best quality feed in terms of specific growth rate, total weight and percentage survival rate for a period of 8 weeks (56 days). One hundred and twenty (120) fingerlings of Clarias gariepinus and six commercial feeds with varying crude proteins namely Chivita, Aquaplus, Vital, Skrettings, Multifeeds and Coppens were used for the experiment. Some water quality parameters analyzed indicated temperature varied from 25.50 ~'C to 28.0 ~'C while pH and dissolved oxygen ranged from 6.6 to 7.2 and 6.3mg/l to 8.2mg/l respectively. The treatment shows significant difference in terms of mean weight gain, specific growth rates and survival rate. The lowest SGR was 0.31 and 0.89 the highest. Fish fed with Chivita and Coppens showed the best growth compared to other treatments.
    Description: Includes: 3 tables.;Also includes: 14 references.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Katsina State ; African catfish ; Local feeds ; Imported feeds. ; freshwater environment ; Freshwater fish ; Feeding experiments ; Growth rate ; Fingerlings ; Feed ; Survival ; Fish culture ; Proteins ; Water quality ; Comparative studies
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  • 28
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    Comparative studies of the growth performance of Clarias gariepinus fingerlings fed commercial feedstuff and live zooplankton (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24154 | 19325 | 2018-05-12 14:54:51 | 24154 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: This study on the growth performance of Clarias gariepinus fingerlings fed separately on zooplankton, coppens, aquaculture feed and a combination of Coppens and zooplankton lasted for 8 weeks. Ninety (90) three-week old Hatchery bred fingerlings of Clarias gariepinus used for the study were acclimated for three (3) days in a concrete tank measuring 1m x 1m and fed with fish meal, before commencement of the experiment. The fingerlings were grouped in tens into 9 concrete tanks measuring 1m x 1m x 1m. These tanks were further grouped into threes to give three treatments labelled A〈sub〉1〈/sub〉 - A〈sub〉3〈/sub〉, B〈sub〉1〈/sub〉 - B〈sub〉3〈/sub〉 and C〈sub〉1〈/sub〉 - C〈sub〉3〈/sub〉. Treatment I (A〈sub〉1〈/sub〉 - A〈sub〉3〈/sub〉) were fed with zooplankton, Treatment II (B〈sub〉1〈/sub〉 - B〈sub〉3〈/sub〉) were fed zooplankton and 3% body weight of coppens, while Treatment III (C〈sub〉1〈/sub〉 - C〈sub〉3〈/sub〉) was fed with 5% body weight of coppens only. Zooplanktons used were mainly rotifers, branchionus and Cyclops. Total length and weight of fish were measured weekly and used as growth indices. Data collected were analyzed using one way Analysis of variance and means separated by Duncan's Multiple Range Test. Results from the study revealed that Treatments II and III were not significantly different from each other (P〉0.05) for both length and weight, but were different from Treatment I (P〈0.05). Based on the result, Treatment II is preferred and is recommended, for use, as zooplankton feed supplement helps to reduce cost of production and still ensure optimal production.
    Description: Includes: 5 tables.;Also includes: 7 references.
    Keywords: Aquaculture ; Ecology ; Clarias gariepinus ; Nigeria ; Delta State ; Zooplankton ; Coopens ; Clarias gariepinus ; freshwater environment ; Growth rate ; Freshwater fish ; Feeding ; Artificial feeding ; Fingerlings ; Zooplankton ; Fish culture ; Food organisms
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  • 29
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    Production of two highly abundant 2-methyl-branched fatty acids by blooms of the globally significant marine cyanobacteria Trichodesmium erythraeum (2021)
    American Chemical Society
    Details
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Gosselin, K. M., Nelson, R. K., Spivak, A. C., Sylva, S. P., Van Mooy, B. A. S., Aeppli, C., Sharpless, C. M., O’Neil, G. W., Arrington, E. C., Reddy, C. M., & Valentine, D. L. Production of two highly abundant 2-methyl-branched fatty acids by blooms of the globally significant marine cyanobacteria Trichodesmium erythraeum. ACS Omega, 6(35), (2021): 22803–22810, https://doi.org/10.1021/acsomega.1c03196.
    Description: The bloom-forming cyanobacteria Trichodesmium contribute up to 30% to the total fixed nitrogen in the global oceans and thereby drive substantial productivity. On an expedition in the Gulf of Mexico, we observed and sampled surface slicks, some of which included dense blooms of Trichodesmium erythraeum. These bloom samples contained abundant and atypical free fatty acids, identified here as 2-methyldecanoic acid and 2-methyldodecanoic acid. The high abundance and unusual branching pattern of these compounds suggest that they may play a specific role in this globally important organism.
    Description: This work was funded with grants from the National Science Foundation grants OCE-1333148, OCE-1333162, and OCE-1756254 and the Woods Hole Oceanographic Institution (IR&D). GCxGC analysis made possible by WHOI’s Investment in Science Fund.
    Keywords: Lipids ; Alkyls ; Bacteria ; Genetics ; Chromatography
    Repository Name: Woods Hole Open Access Server
    Type: Article
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