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  • 1
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    Effects of salinity on larval dimension of Tilapia guineensis (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23422 | 19325 | 2018-04-25 19:24:46 | 23422 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Tilapia guineensis eggs were spawned and hatched in different salinities (17, 12, 7, 5, 2 and 0) ppt. The study was conducted in eight replicates. The aim of the investigation was to ascertain disparity in hatching size of Tilapia guineensis attributable to salinity. Immediately hatching was observed, body weight of five hatchlings in each replicate was individually weighed in milligramme. The individual total length of the five hatchlings was also measured in millimeter. The height of the yolk sac larva was determined with micro-metre screw gauge graduated in millimeter from the top of the yolk sac to the dorsal region of the larva. Data obtained were used to calculate yolk sac volume. Significant differences (P〈0.01) were observed in body weight and total length of larvae hatched in different salinities. The heaviest and longest larvae were hatched in 12 ppt saline water. The yolk sac volume of larvae hatched in lower salinities were significantly higher (P〈0.01) than the yolk sac volume of larvae hatched in higher salinities. The smallest yolk sac volume was recorded in 12ppt saline water. Our findings show that salinity could be manipulated for economic production of heavier seeds of Tilapia.
    Description: Includes:- 5 tables.;6 refs.
    Keywords: Aquaculture ; Chemistry ; Tilapia guineensis ; Nigeria ; brackishwater environment ; Salinity effects ; Larvae
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 51-55
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  • 2
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    Design and construction of electronic security system for aquaculture water-recirculatory system (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23414 | 19325 | 2018-04-12 09:08:55 | 23414 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Electronic play a vital role in providing security. A security alarm system was designed and constructed to safeguard aquaculture water recirculatory system against illegal entry. The system involved a laser touch which is easily available and it is used for the operation of the device. The laser beam is directed across the entrance to the water recirculatory system, falling on a light dependent resistor (L.D.R). Any unwanted interruption of the laser beam would result into energization of the alarm and indicating security danger. A prototype water recirculatory system was constructed and interfaced with the devices and the device was found efficient and reliable.
    Description: Includes:- 2 tables;1 fig.;4 refs.
    Keywords: Aquaculture ; Nigeria ; freshwater environment ; Electronic equipment ; Security ; Defence craft ; Fish culture
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 6-9
    Format: 701
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  • 3
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    Appraising three (3) decades of aquacultural development in Imo state (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23420 | 19325 | 2018-04-25 19:21:06 | 23420 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: A survey was carried out to appraise the level of aquacultural development in the last 30 years in Imo State, South eastern, Nigeria. The study was conducted by the use of questionnaires and visits to fish farms in all the three senatorial zones of the State namely; Okigwe, Orlu and Owerri. Data collected revealed that 79.49% of the farms were owned by individuals while values of 12.82%, 5.13% and 2.56% represents government, community and cooperative ownership respectively. However, 17.95% of ponds were established between 1978-1988 while 46.15% represents fish ponds established between years 1998-2008 . Earthen ponds were commonest with pond areas varying between 400-10,000m2.
    Description: includes:- 8 tables.;6 refs.
    Keywords: Aquaculture ; Nigeria ; Imo state ; freshwater environment ; Aquaculture development ; Fish culture
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 41-44
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  • 4
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    Economics of trickling biological periwinkle shell filter for closed recirculating system (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23417 | 19325 | 2018-04-25 19:14:49 | 23417 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Studies on the economics of trickling biological periwinkle shells filter for closed recirculating catfish system was carried out at the University of Science and Technology, Port Harcourt, Nigeria for 12 weeks. The periwinkle shells biofilter and other recirculating aquaculture system (RAS) components were designed and set up for a pilot catfish production using Clarias gariepinus juveniles at the stocking density of 400 fish/m3. Using fish holding tank volume of 0.21m3, biofilter volume of 1m3, sedimentation tank volume and flow rate of 4.20m3 and 0.78m3/hr respectively, lift pump flow rate of 2.10m3/hr, and an annual production of 3 tons of catfish, a record of all financial expenditures was kept. The financial analyses of the system with periwinkle shells filter and that of imported plastic filter block of same size were prepared. The discounted cash flow projections for the two systems were also prepared. From the discounted cash flows, the economic viability indices for the two systems were computed. The economic analysis compared the profitability index of 1.45 and the payback period of 2.50 years for the system with periwinkle shells filter to the profitability index of 0.60 and payback period of 5.90 years for the imported plastic filter block, and concluded that the system with periwinkle shell filter was cheaper and more cost effective
    Description: Includes:- 5 tables.;10 refs.
    Keywords: Aquaculture ; Nigeria ; Port Harcourt ; Recirculatory aquaculture system ; freshwater environment ; Fish culture ; Cost analysis
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 22-29
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  • 5
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    Growth performance and nutrient utilization of common carp (Cyprinus carpio and Cyprinus carpio var specularis) fingerlings in New Bussa, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23424 | 19325 | 2018-04-25 19:30:19 | 23424 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: An investigation was carried out into the growth performance and nutrient utilization of common carp fingerlings in New Bussa, Nigeria, at the Hatchery Complex of National Institute of Freshwater Fisheries Research (NIFFR). The Carps were purchased from Jos, and transported to New Bussa, acclimatized for two weeks and stocked in outdoor concrete tanks measuring 2mx2mx1m containing filtered water to the level of 0.5m. Average weight and total length at the time of stocking were 40.80g and 6.30g respectively. The fish were stocked in four treatments, each replicated thrice at varying stocking densities of 3, 6, 9 and 12fish/m2 respectively. The fish were fed 35% crude protein formulated feed at 5% biomass and each daily feed was divided into two equal parts and fed manually by 9.00am and 6.00pm. Quantity of feed adjusted according to weight gain. Biweekly sampling was carried out for a period of 8 weeks, their morphological studies carried out. Weight gain, total length and feed consumed were recorded. Water parameters were monitored every sampling day. The result revealed that there is significant difference (P〈0.05) in all the parameters. The group with 48 (12 fish /m2) density exhibited significantly (P〈0.05) poorest weight gain and there was no significant difference (P〉0.05) between 12 and 24 stocking (3 and 6 fish/m2) densities as far as weight gain is concern. All other parameter; SGR, length, weight gain and feed consumed were also significantly different (P〈0.05). The treatment with 12fish/m2 showed significantly (P〈0.05) poorest feed conversion ratio (FCR). The treatment with stocking of 3 and 6fish/m2 performed best, therefore this stocking range is recommended in this zone. Acquiring of carp from colder region to hotter region is better done in the peak of raining season and to be transferred to earthen pond before hot weather resumes.
    Description: Includes:- 13 refs.
    Keywords: Aquaculture ; Cyprinus carpio ; Cyprinus carpio var specularis ; Nigeria ; New Bussa ; freshwater environment ; Growth rate ; Nutritional requirements ; Feeding experiments ; Fish culture ; Food conversion
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 60-63
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  • 6
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    Growth response and survival of Heterobranchus longifilis cultured at different water levels in outdoor concrete tanks: implications for culture (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23425 | 19325 | 2018-04-25 19:31:54 | 23425 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Thirteen-day-old hatchery-raised fry obtained from hormonally-induced spawns of mature African catfish H. longifilis broodstock were introduced to three different water levels (0.35, 0.50 and 0.65 m) in four replicates in 12 units of 2x2x1m3 outdoor concrete tanks. The fry were similarly stocked initially at 50 fry/m2 and later thinned down to 5 fish/m2 and cultured for 6 months. Fish were fed twice daily with commercial pellet feeds (Coppens?) while adjusting the feeding rate from 10 to 4% body weight and pellet size from 0.2 to 4.5 mm. The effects of pond water levels were evaluated in growth responses and survival. Water quality variables were similar (p 〉 0.05) in all compartments. Temperature, dissolved oxygen and pH were at the optimum level for fish. The results reveal significant (P 〈 0.05) treatment effects on growth performances. Fish kept at the highest pond water depth (0.65m) were heavier (P 〈 0.05) and had a higher specific growth rate (P 〈 0.001) than the others. Food conversion ratio and survival rate were unaffected by the experimental treatments. ANOVA revealed significant differences (P〈0.05) with culture period. The lowest water depth (0.35 m) favoured fish growth in the first 3 months while the highest water depth (0.65 m) favoured fish growth from the fourth month upwards (P〈0.05). These results are important because they indicate the optimum water depths for the culture of H. longifilis from fry to sub-adult and from the grow-out/fattening of sub-adult to adult, respectively, in outdoor concrete tanks.
    Description: Includes:- 3 figs.;35 refs.
    Keywords: Aquaculture ; Heterobranchus longifilis ; Nigeria ; Abia State ; freshwater environment ; Fish culture ; Survival ; Feeding experiments
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 64-72
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  • 7
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    Fish hatchery survey in Borno State, Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23428 | 19325 | 2018-05-02 08:04:53 | 23428 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Aquaculture is regarded as being uniquely placed to reverse declining supplies from capture fisheries and for this to be realized, fish hatchery has a notable role to play. Fish hatchery is the bedrock upon which true and sustainable fish farming can be built. A field survey was conducted in the 3 geo-political zones of the State to look into the number and functionality of fish hatcheries. Results showed that there were about 23 fish hatcheries in the State with the majority concentrated in Maiduguri metropolis. Private ownership (79%) dominated of which 84% were functional. Average annual production is less than 10,000 fingerlings in most hatcheries while the wild sourced fingerlings were used as alternative by the majority. Most hatcheries (62%) made use of concrete tanks for breeding and nursery. All the respondents were of the opinion that the level of patronage was encouraging, though agreed that the level of aquaculture development in the State was low. However, few among the respondents said aquaculture development in the State is on the increase due to low productivity of natural water bodies for the past 10 years. Recommendations were made on how to improve hatchery operation that could help to boost aquaculture development in the State
    Description: Includes:- 3 tables.;3 figs.;5 refs.
    Keywords: Aquaculture ; Nigeria ; Borno State ; Hatchery management ; freshwater environment ; Fish culture ; Freshwater aquaculture
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 88-93
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  • 8
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    Comparative analysis of physicochemical characteristics of ABU and Zaria Dam (2021)
    Fisheries Society of Nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23440 | 19325 | 2018-05-02 08:25:12 | 23440 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: The physical and chemical parameters of ABU Dam and Zaria Dam were carried out between September and October 2009. The results obtained in the two water bodies were temperature 27.7 0C, pH (7.5 and 7.3), dissolved oxygen (5.8 mg/l and 5.0 mg/l), biochemical oxygen demand (1.74 mg/l and 2. 16 mg/l), alkalinity (58 mg CaC03/l and 49 mgCaCO3/l) P04-P (2.47 mg/l and 1.59 mg/l) NO3-N (3.67 mg/l and 3.47 mg/l), conductivity (54.70 ~ks-1 and 42.48 ~ks-1), total hydrocarbon (TH) (47.66 mg/l) and 48.00 mg/l) and total dissolved solids (32.68 mg/l and 25.35 mg/l) respectively. There was no significant difference in the mean values of the parameters (P〉0.05) except conductivity and total dissolved solids. The water bodies were found to be neutral with high conductivity. All the properties in the water bodies were in conformity with international standards both for drinking and aquatic life.
    Description: Includes:- 2 tables.;7 refs.
    Keywords: Chemistry ; Limnology ; Pollution ; Nigeria ; Zaria Dam ; Nigeria ; ABU Dam ; freshwater environment ; Physicochemical properties ; Pollution
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 144-146
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  • 9
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    Relationship among Tilapia guineensis fingerlings abundance and water quality variations in a brackish water reservoir in Lagos (2021)
    Fisheries Society of Nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23442 | 19325 | 2018-05-02 08:28:15 | 23442 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: In recent times there has been an upsurge in the culture of Tilapia in Nigeria resulting in increased demand for the fingerlings which is hardly satisfied. This is due to increasing demand for table size tilapia as food fish and under-sized tilapia in the fish meal and fish canning industries in Nigeria. Collection of Tilapia guineensis fingerlings from the wild, to augment hatchery production, has been the practice and this is subject to environmental fluctuations. Multivariate regression and correlation analyses of accumulated data were used to investigate the effects of changes in water quality parameters on abundance of fingerlings of Tilapia guineensis in a brackishwater habitat in Lagos. Dissolved oxygen (DO), salinity and secchi transparency were found to be the most dominant factors affecting the abundance of Tilapia guineensis fingerlings in the Lagos lagoon. Peak period of abundance was closely associated with period of low salinity (0.50%o to 5.60%o), which coincided with the period of low transparency and low DO in the rainy season. The correlation analyses of Tilapia guineensis fingerlings with the water quality parameters yielded the following correlation coefficients (r)- 0.598; (salinity); -0.644 (transparency); -0.710 (DO); -0.566; (temperature) and 0.129 (pH). The abundance of Tilapia guineensis fingerlings in the Lagoon was ultimately defined by a suitable regression equation. This result is expected to optimize the collection of fingerlings of Tilapia guineensis from the wild and boost food fish security in Nigeria and elsewhere.
    Description: Includes:- 1 table.;1 fig.;( refs.
    Keywords: Chemistry ; Fisheries ; Tilapia guineensis ; Nigeria ; Port Harcourt ; brackishwater environment ; Water quality ; Fingerlings ; Chemical properties ; Physicochemical properties
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 153-157
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  • 10
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    Spatial and temporal variations of physicochemical variables in a small 'pristine' stream in Niger Delta, Nigeria (2021)
    Fisheries Society of Nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23445 | 19325 | 2018-05-02 08:32:33 | 23445 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Spatial and temporal variations of physico-chemical variables of Onu-Iyi ?Ukwu stream were studied for 12 months from March 2005 to February 2006. Three sampling stations were established along the main stream channel from source to mouth. Spatial variation in physico-chemical parameters indicated that total alkalinity, total hardness, conductivity, and nitrate-nitrogen (NO3) recorded their highest values at the upper reaches (with values 14.0mg/l, 88.09mg/l, 17.00~kscmiscm, and 0.60mg/l respectively). Dissolved Oxygen (DO) and pH had their maximum values of 8.20mg/l and 6.94 at the middle reaches. Turbidity, biochemical oxygen demand (BOD), temperature and phosphate-phosphorus (PO4) increased steadily from source to mouth. The observed seasonal variation indicated that wet season values were higher for all the parameters except temperature, turbidity, phosphate-phosphorus (PO4) and total alkalinity although the values were not statistically significant at p〉0.05. The correlation coefficient (r) showed no significant relationships p〈0.05 between physico-chemical parameters except DO and BOD with correlation values of (0.75 and -0.54) respectively.
    Description: includes:- 2 tables.;1 fig.;17 refs.
    Keywords: Chemistry ; Limnology ; Nigeria ; Onu-Iyi-Uku Stream ; freshwater environment ; Physicochemical properties ; Phosphates ; Phosphorus ; Turbidity
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 174-180
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