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  • 1
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    Functional roles of mangroves of the Niger Delta to the coastal communities and national economy (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23434 | 19325 | 2018-05-02 08:11:31 | 23434 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Mangrove swamps supply various goods and provide invaluable ecological services, especially as critical habitats for fish breeding. These functions are discussed in the context of rural livelihoods of coastal dwellers in the Niger Delta in particular, and the contribution to national economies in general. The decline in capture fisheries production in Nigeria is partly linked to massive mangrove loss in the Niger Delta. This provides basis for urgent evolution of effective mangrove conservation schemes in the Niger Delta and for focused research on the interaction between the delta mangroves and inland/coastal fish recruitment and production dynamics.
    Description: Includes:- 23 refs.
    Keywords: Ecology ; Fisheries ; Nigeria ; Mangroves ; brackishwater environment ; Mangroves ; Fishery economics
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 119-123
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  • 2
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    Impact of calcium carbonate on the juveniles of brackish river prawn, Macrobrachium marobrachion under laboratory conditions (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24674 | 19325 | 2018-05-23 07:49:22 | 24674 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The acute toxicity and the effect of sub-lethal concentrations of calcium carbonate on the morphology of M. macrobrachion were investigated under laboratory conditions. The prawns were exposed at 0, 160, 320, 640, 1280, 2560 and 5120 mg/l of CaCO3 using static renewal bioassay for 96 hours for the acute toxicity test. The prawns were also exposed for the chronic test at 0, 20.0, 40.0, and 80.0 mg/1 for a period of two weeks. Mortality occurred in the bioassay tanks at random and the bioassays were monitored throughout the exposure period. Results showed that exposed prawns were not significantly impacted when compared with the control group and correlations were significant at P〈0.05. There were no mortalities in the tanks with the highest concentrations while one death was recorded in the control tank and in the tank with the 160 and 320mg/1 of CaCO3 respectively. The gills of exposed prawns were analyzed using photomicrography and the results showed that the organs had their normal morphological status after the exposure time, implying that CaCO3 is non-toxic to M. macrobrachion. The applications of the result to prawn culture and water quality management were discussed in details.
    Description: Includes: 12 references.
    Keywords: Pollution ; Aquaculture ; Macrobrachium macrobrachion ; Nigeria ; Acute toxicity ; Sub-lethal concentration ; Static renewal bioassay ; Histology ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 439-441
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  • 3
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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
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 149-163
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  • 4
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    Some ecological factors of the tropical floodplain influencing the breeding and conservation of Gymnarchus niloticus (Cuvier 1829): a review (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24096 | 19325 | 2018-05-16 14:04:57 | 24096 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Gymnarchus niloticus is the only species of the family Gymnarchidae. It is a popular food fish in most parts of Africa where it is greatly esteemed. In some culture, it is offered as a special gift to leaders during festive seasons, while in some others it is an important part of items presented by a suitor to the parents of a girl at the time of betrothal. It can therefore be inferred that G. niloticus is not only important as food fish with economic significance, but also plays vital roles in the socio-cultural life of some African tribes. The supply of this important species still depends largely on the catch from the wild. However, based on the method of catch, it has been classified as endangered. A close examination of the ecological factors in the floodplain (where it migrates to breed), revealed strong influence on the breeding and survival of the fish. The level of rainfall determines the extent of floodplain inundation, and the abundance and survival of the flora and fauna in the area. These in turn determine the availability of breeding substrates and natural food sources for the various stages of G. niloticus. Therefore, rainfall, the flora and the fauna of the floodplain play vital roles in the breeding and survival of G. niloticus in nature. To ensure the conservation of this important species, controlled propagation strategies that draws on the influence of prevailing ecological factors in the floodplain is recommended. This will ensure conservation, and protect the economic and socio-cultural significance of G. niloticus.
    Description: Includes: 4 figures;Also includes: 36 refs.
    Keywords: Aquaculture ; Ecology ; Fisheries ; Gymnarchus niloticus ; Nigeria ; Ecological factor ; Tropical floodplains ; Breeding ; Conservation ; Gymnarchus ; Tropical floodplains ; freshwater environment ; Flood plains ; Ecology ; Breeding ; Conservation ; Fish ; Food fish ; Commercial species ; Rare species ; Catch/effort ; Ecological distribution
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 193-200
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  • 5
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    Food habits, sexual dimorphism and sex ratio of three Palaemonid prawns of the Nun River, Niger Delta, Nigeria (2021)
    Fisheries Society of Nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23463 | 19325 | 2018-05-05 12:36:20 | 23463 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: The food habits, sex ratio and differences of three freshwater prawns ? Macrobrachium vollenhovenii, M. macrobrachion and M. felicinum from Nun River, Niger Delta were studied. It was found that although the prawns had an omnivorous diet feeding on a wide range of organisms including plants, detritus, insect parts, phytoplankton and zooplankton the food habits indicate a tendency towards a plant-based (herbivorous) diet. The adult prawns exhibit sexual dimorphism with males being larger than females; however the males were fewer in number than the females with mean ratios of 1:2.79, 1:1.58 and 1:9.12 for M. vollenhovenii, M. macrobrachion and M. felicinum. Sexual dimorphism exists in the species and brood-stock are available in the Nun River system of the Niger Delta region.
    Description: Includes:- 3 tables.;12 refs.
    Keywords: Ecology ; Macrobrachium vollenhovenii ; Macrobrachium macrobrachium ; Macrobrachium felicinum ; Nigeria ; Nun ; R. ; freshwater environment ; Feeding behaviour ; Feeding experiments ; Aquaculture ; Sexual dimorphism ; Prawn culture
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 290-294
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  • 6
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    Comparative quality assessment of two-smoked dried fish species (Clarias gariepinus and Tilapia guineensis) using oil bean seed and rubber trees as firewood (2021)
    In:  http://aquaticcommons.org/id/eprint/24190 | 19325 | 2018-05-16 15:01:44 | 24190 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The quality of two processed fish products (Clarias gariepinus and Tilapia guineensis) using oil bean and rubber trees as firewood were assessed. The weight and size of the fishes were weighed and measured as well as the weight and size of the fire wood before the start of the experiment. Clarias gariepinus weighed 0.72kg while tilapia weighed 0.4kg with total and standard lengths of 35cm and 3 for C. gariepinus while the total and standard lengths for tilapia were 20cm and I7cm respectively. Two metal smoking kilns were used to provide chamber for the different fire wood and platform for the fish smoking. The fish used were procured from Africa Regional and Aquaculture Centre (ARAC) Aluu, Port Harcourt, Rivers State, Nigeria. The fish were washed, gilled, and salted to improve the taste quality of the fish product. The fire was made and the fish were smoked for 48hrs at 79~'C average heat. The heat was measured using distant reading thermometer and readings taken. The fishes were reweighed and measured after smoking for 48hrs. The results showed a decrease in weight and size due to reduction in moisture content. Organoleptic assessment of the two different fish spp from the two fire woods revealed that oil bean tree was more preferable for fish smoking because it gives the fish good taste, smell, appearance hence attract fish acceptability and market value compared to the rubber tree fire wood. The results also revealed that the cat fish C. gariepinus was more acceptable and appealing after smoking because of its good smell, texture, and appearance compared to the tilapia. In view of the outstanding and economic qualities of the oil bean tree fire wood in fish smoking and since fish smoking still remains a major form of fish processing in Nigeria and Africa at large, it is therefore imperative to recommend it as fuel for fish smoking. Moreover, its availability, production of good smoke enhances wholesomeness and longer shelf life of fish products.
    Description: Includes: 3 tables.;Also includes: 12 references.
    Keywords: Fisheries ; Health ; Clarias gariepinus ; Tilapia guineensis ; Nigeria ; Port Harcourt ; Quality assurance ; Smoked and dried fish ; Shelf life ; Oil bean seed and Rubber seed trees ; freshwater environment ; Cured products ; Dried products ; Freshwater fish ; Organoleptic properties ; Taste ; Storage life ; Comparative studies ; Fuels ; Acceptability ; Market research ; Processing fishery products
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 158-160
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  • 7
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    Aspects of the reproductive biology of Mugil cephalus (Linnaeus, 1857) in Bonny Estuary (2021)
    In:  http://aquaticcommons.org/id/eprint/3662 | 424 | 2011-09-29 17:00:30 | 3662 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-06-28
    Description: Aspects of the reproductive biology of Mugil cephalus in the Bonny estuary (Nigeria) were studied between January and December 1996. Males were observed to be more slender than females while the females have deeper bodies. The male:female ratio (1:0:95) was not significantly different. The minimum size at maturity was 16.6cm (0.5 yr). Fish matured at 24.3cm TL(1.76 yr) with median maturity size of 19.5cm TL(0.71 yr). Median maturity for male and female fish were 16.4cm TL(0.41 yr) and 18.2cm TL(0.60 yr) respectively. Breeding occurred once a year between September and December, from late rainy season to early dry season. Mean absolute fecundity was 1,403, 808 eggs (range 107, 729-4,445, 423 eggs) for fish of 17.0.29.5cm TL (mean 22.5cm TL). Fecundity correlated positively with fish total weight, length, ovary weight and age
    Keywords: Fisheries ; Biology ; Nigeria ; Rivers ; Bonny Estuary ; brackishwater environment ; estuarine organisms ; fecundity ; reproductive cycle ; sex ratio ; sexual maturity ; Mugil cephalus
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 82-88
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  • 8
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    Age and growth of Mugil cephalus (Linnaeus, 1758) (Perciformes: Mugilidae) in Bonny Estuary (2021)
    In:  http://aquaticcommons.org/id/eprint/3698 | 424 | 2011-09-29 16:53:29 | 3698 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-06-29
    Description: The age and growth of Mugil cephalus was investigated in Bonny Estuary, Nigeria, from January, 1995 to December, 1996. Length-weight relationships were isometric with length exponents of 2.84 (males), 2.90 (females) and 2.88 (overall). Modal length at age were 12.0cm, 20.9cm, 25.0cm, 28.4cm and 30.2cm TL for ages 0+, 1+, 2+, 3+ and 4+ respectively. Corresponding total weights were 20.01g, 78.93g, 173.12g, 217.61g and 247.50g, respectively. Asymptotic length (Lo) was estimated 33.2cm TL, asymptotic weight (W sub(o)) was 484g, growth coefficient K=0.55847 super(-1) and hypothetical age at zero length To = 0.152yr. Longevity, Tmax, was 5.0yr, length and weight growth performance indices were Q super(1)=2.79 and Q = 1.44, respectively. Total mortality, natural mortality and fishing mortality were z = 1.02yr super(-1), M=0.607yr super(-1) and F=O. 3129yr super(-1), respectively. The exploitation ratio E was 0.4048 and exploitation rate U = 0.2302yr super(-1)
    Keywords: Fisheries ; Biology ; Nigeria ; Rivers ; Bonny Estuary ; age ; growth ; length-weight relationships ; Mugil cephalus
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 119-129
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  • 9
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    Market survey of the periwinkle Tympanotonus fuscatus in Rivers State: Sizes, prices, trade routes and exploitation levels (2021)
    In:  http://aquaticcommons.org/id/eprint/3370 | 424 | 2011-09-29 17:31:42 | 3370 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-06-25
    Description: Tympanotonus fuscatus was collected from 23 markets through Rivers State (Nigeria), a few in neighbouring states, and from an unexploited population at Buguma. The size distribution of shells was determined,and information on prices and trade routes was also obtained. The mean shell length of specimens from the unexploited Buguma population was 46.4 mm, compared to 30.4 mm for the Buguma market samples. Mean sizes in other markets showed a geographic pattern: the smallest were from the Adoni-Ogoni-Opobo sector (28.1-30.9); the largest were from the Nembe-Brass sector (37.7-44.2) and Bendel State (35.7-45.6); The results suggest the population structure of Tympanotonus in much of Rivers State has been strongly impacted by overharvesting. They show that local market as well as some in Cross River State, are increasingly being supplied by road with specimens from the Benin River area of Bendel State. Differences between shell types; and relations between shell size, selling price and market distance from source, are also discussed
    Keywords: Fisheries ; Nigeria ; River State ; fishery industry ; gastropod fisheries ; market research ; overfishing ; shells ; size distribution ; Tympanotonus fuscatus
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 55-61
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  • 10
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    Identification of West African estuarine shrimp and crab larvae (2021)
    In:  http://aquaticcommons.org/id/eprint/3411 | 424 | 2010-12-14 18:10:41 | 3411 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-06-25
    Description: The paper deals with the decapod crustacean larvae likely to be found in fresh and brackish waters in tropical west Africa. It summarizes results from an ongoing program of describing larvae hatched directly from adults of known species, to provide the identification keys necessary for applied research on nursery grounds, plankton ecology and pollution effects. A preliminary key to stage - 1 larvae is given for approximately 40 species. In includes all the genera, and nearly all the species, known to produce larvae in fresh and low-salinity waters. The common species of higher salinity waters are also included
    Keywords: Biology ; Aquaculture ; Nigeria ; check lists ; crustacean larvae ; developmental stages ; identification keys
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 197-206
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