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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
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 16-18
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  • 2
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    Tilapia sex reversal using methyl testosterone (MT) and its effect on fish, man and environment (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24621 | 19325 | 2018-05-22 06:17:09 | 24621 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Tilapia is the second leading aquatic crop globally, next to carps and its production has increased tremendously within the last decade. Its production is however affected by stunting, a phenomenon brought about by overpopulation due to precocious reproduction under mixed sex culture system. Several methods such as use of predatory fish, hybridization, polyploidy and sex reversal, using methyl testosterone have been employed w1th different degrees of success. This paper reviews the use of methyl testosterone in sex reversal of tilapia and its consequent effects on fish, man and environment. It established the preference of all-male tilapia due to better and more uniform growth under culture system. It has been demonstrated that the hormone does not have any adverse effect on fish flesh after cessation of treatment of tilapia fry. In like manner; ingestion of fish produced by sex reversal does not therefore harm man. However,one is not too sure of the effect of the hormone or its by- products on vital organs (liver, kidney, pancreas and gills), metabolic profile and nucleic acids. This may also affect muscle building and perceived libido-enhancement in man. On the environment, the steroid is either biodegraded or mineralized. It must be stated that escapee from tilapia hatchery into the natural water may, however, alter the dynamics of the environment due to unforeseen consequences.
    Description: Includes: 14 references.
    Keywords: Aquaculture ; Biology ; Oreochromis niloticus ; Nigeria ; Sex reversal ; Tilapia ; Man ; Environment ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 217-219
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  • 3
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    Comparative assessment of fermented maize broth and cassava waste water on the growth performance of catfish (Clarias gariepinus) fry (2021)
    FISON | Minna (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24078 | 19325 | 2018-05-12 14:08:28 | 24078 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The study was conducted to evaluate and compare the growth performance of catfish fry on fermented maize broth and cassava waste water. Four day old fry (weight range 0.002 - 0.003g) of C. gariepinus were acclimatized in 10 litres glass tank of water for 5 days in Aquaculture Department of Nigerian Institute for Oceanography and Marine Research, Victoria Island, Lagos. Shell free artemia was mixed with Fermented Maize Both (FMB), Fermented Cassava Waste water (FWC) and bore hole water (control) respectively. The artemia mixtures were allowed to air-dry before administration. The treatments were produced in triplicates, feeding, ad-libitium for 30 days. The fry were fed with the treated shell free artemia and weighed every 6 days. The results revealed that fry fed fermented cassava waste water [FCW] diet showed highest mean weight, daily growth rate [DGR], survival rate and specific growth rate [SGR] and lowest food conversion ratio (FCR). This was followed by fermented maize broth while fish fed artemia mixed with borehole water-had the least growth. The results suggest that addition of fermented cassava waste water to shell free artemia can enhance fish growth in catfish hatchery production.
    Description: Includes: 1 table and 1 figure;Also includes: 13 refs.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Lagos ; Growth performance ; Fermented cassava waste water (FCW) ; Maize broth (FMB) ; freshwater environment ; Feeding experiments ; Fish culture ; Growth rate ; Fish ; Fry ; Feed ; Nutrients (mineral) ; Waste water ; Comparative studies ; Fermentation ; Length-weight relationships
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 79-83
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  • 4
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    Growth performance of wild strains of Clarias gariepinus from Nigerian waters (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24581 | 19325 | 2018-05-20 06:03:14 | 24581 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: The catfish (Clarias gariepinus) is the leading aquatic crop in Nigeria. Most of the strains used in aquaculture are suffering from in-breeding depression with its attendant poor egg and sperm quality. There is therefore the need to explore the natural population of the fish to improve performance. This study was carried out to evaluate the growth performance of strains of the catfish across the fresh water systems of Nigeria. Collections were made from the six geopolitical zones namely: North-Central (Kogi), Northeast (Adamawa), Northwest (Kebbi), South-West (Oyo), Southeast (Anambra), South-South (Delta) and domesticated strain obtained from Lagos. The fish were bred in the wet laboratory of the Department of Fish Technology/Biotechnology of the Institute for Oceanography and Marine Research, Lagos and fed for 12 weeks before subjected to growth study. The study involved allocation of 25 juveniles of each strain in lm hapas installed in a 0.4 ha at Badore fish farm, Lagos, Nigeria,fed 3% body weight twice daily while sampling forth-nightly. The results showed that the domesticated strain of C. gariepinus performed significantly better (a=0.05) than the six wild strains studied. This may be attributable to selective breeding which probably had been carried out by the farmers from which the broodstocks were purchased and mixture of the gene pool of improved Dutch strain commonly cultured. There was however no significant variation in the SGR and FCR among the strain. However, the growth study showed that the strain from North-West (Kebbi) did not perform as much as other strains in terms of these growth indices. Hoewever, it had the highest survival (96%). The strains from Oyo and Anambra however showed better growth over the rest strains from the wild. The implication of the breeding potentials of C. geriepinus strains from Kebbi, Oyo and Anambra is that if several selective breeding of these strains are carried out and the gene pool of Kebhi is combined with any of these two, we are likely to obtain fish seed of better growth and survival.
    Description: Includes: 14 references.
    Keywords: Aquaculture ; Clarias gariepinus ; Nigeria ; Growth ; Performance ; C. gariepinus ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 65-67
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  • 5
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    Genetic status of tilapia at Badore landing site using RAPD markers (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24620 | 19325 | 2018-05-22 06:15:41 | 24620 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Molecular technique based on Random Amplified Polymorphic DNA (RAPD) analysis was applied to study genetic status among tilapia species from Badore landing site of Lekki lagoon. Individual variations within species population were assessed using PCR-RAP analysis with five Operon primers (OPC04, OPA02, OPB08, OPE02 and OPF03, Operon Technologies Inc, USA) which revealed dif ferent banding patterns of varying primer reproducibility. Graphical representation using UPGMA cluster analysis produced a dendrogram chart with five clusters (~f, ~e, ~p ,~S, and ~W) indicating different degrees of variations and similarities. There were various levels of genetic similarity observed possibly due to hybridization. Nevertheless, few distinct variations among the samples were visible, show ing possible genetic variability. At 0.89 (89%) coefficient, cluster,~f is made up of 7 samples which are genetically similar. At 0.834 (83.1 %) coefficient, distinct sample BTl2 forms a cluster (~p) with cluster ~f which shows they are related at this coefficient. Cluster ~W (84% coefficient) comprising of 7 samples forms another cluster with a distinct sample BT06 at about 0.79 coefficients. At 78.6% coefficient (cluster ~e). All the samples are genetically similar except sample BT17. This distinct sample can increase genetic variability by a cross between it and other strains of tilapia. Therefore, care should be taken by fish farmers who buy or use the fish samples from this landing site for culture. Proper molecular characterization of this fish species before culture becomes necessary to avoid genetic problems.
    Description: Includes: 17 references.
    Keywords: Biology ; Fisheries ; Nigeria ; Genetic ; Tilapia ; RAPD ; Badore ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 214-216
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  • 6
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    Hybridization and speciation among cichlids: the case of 'Wesafu', an ecotype cichlid (2021)
    Fisheries Society of Nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23469 | 19325 | 2018-05-05 12:49:04 | 23469 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Fishes of the family Cichlidae are known for spectacular adaptive radiation and therefore serve as a model for evolutionary and ecological studies. They are highly speciated due to hybridization that frequently occur in the wild. The existence of an ecotype cichlid, ’wesafu’ in Epe Lagoon, Lagos, Nigeria appears to be the result of such hybridization. This paper reviews the profile of wesafu and compare the species with other cichlids, evaluate the probable causes of speciation which includes diversity in feeding morphology, mate choice, adaptation to changes in habitat arising from water level dynamics , eco-phenotypic variation, restricted migration to predation and introgressive hybridization. The implication of such speciation and hybridization were also highlighted.
    Description: includes:- 2 tables.;24 refs.
    Keywords: Fisheries ; Nigeria ; Epe Lagoon ; marine environment ; Hybridization ; Biological speciation ; Species diversity
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 319-324
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  • 7
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    Role of women in fisheries and fish processing: a global view (2021)
    Fisheries Society of Nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23522 | 19325 | 2018-05-09 12:25:25 | 23522 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: Women are the majority of the third World population. They are considered subservient to their male counterpart, even in Europe and America where women have greater basic human right. This paper evaluates the various roles of women in Fisheries and fish processing. Statistics from the European Union shows that, of the various fishing sectors, participation of women (in terms of number) was greatest in fish processing, followed by marine aquaculture, marine fishing and inland aquaculture, with no women involved in inland fishing. In Asia and Africa women are basically involved in fish processing and marketing. In Asia (Thailand and Philippines), women are involved in hatchery operations in aquaculture in addition to fish processing. The finding of the review shows that Fish processing in developing countries, principally Africa is not attracting young literate generation who may have better management competence. It further revealed that, in Nigeria women are directly involved in capture fishery, in addition to fish marketing and processing. This is aimed at empowering women economically to meet the pressing needs of the family. The paper further assesses the problems of women in fisheries and fish processing namely, access to financial resources, education, support services and the need to ensure food security. Possible ways of improving women’s participation in fisheries were highlighted.
    Description: Includes:-1 table.;23 refs.
    Keywords: Fisheries ; Nigeria ; freshwater environment ; Women ; Processing fishery products
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 640-648
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  • 8
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    Survey of the present and fast disappearing fish species along two rivers in the Niger Delta (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24647 | 19325 | 2018-05-24 09:55:05 | 24647 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Fisheries resources are on the decline in Nigeria due to over exploitation and inadequate management of her coastal waters. For sustainability of these resources, an adequate knowledge of species composition, diversity and relative abundance of her water bodies must be understood and vigorously pursued. A survey was conducted to determine fish species diversity in Brass and Nun River, Niger Delta, Nigeria and the socioeconomic studies carried out to determine the status of endanger or level of disappearance of fish species study area. The survey identified 53 species from 18 families caught from Brass and Nun stations respectively. The fish diversity from typically freshwater fishes such as Tilapia and Clarias to brackish species such as Chrysichthys nigrodigitatus and Penaeus species. The most abundant family within catch were the Scianidae, Cichlidae and Clariidae. A checklist of economically important fast disappearing fish species along the two water bodies was generated. Oil spillage, discharges from industries (industrialization) and the domestic wastes from boundaries settlements (urbanization) and farming activities along the tributaries were among the factors identified to have contributed to low species diversity and fast disappearance of certain species. Data generated from this study would serve as baseline information for fisheries resource management.
    Description: Includes: 11 references.
    Keywords: Fisheries ; Chrysichthys nigrodigitatus ; Tilapia guineensis ; Penaeus notialis ; Fistularia tabacaria ; Ethmalosa fimbriata ; Sphoeroides pachygaster ; Mobula coilloti ; Nigeria ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 322-323
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