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  • 1
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    Effects of atrazine on Nile tilapia (Oreochromis niloticus) (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24616 | 19325 | 2018-05-22 06:07:52 | 24616 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Mechanization of agriculture to promote and improve the yields from agricultural practices has necessitated the use of pesticides and other agrochemicals. The effects of using these pesticides on the environment are rarely considered by farmers. This study investigated the effects and sub-lethal effect of atrazine on tilapia, an ubiquitous culturable fish species. The 96 hr LC50 was determined using static renewal bioassay method while the effect on haematological parameters was determined after exposure for 3 weeks to sub-lethal doses of atrasine. The LC50 was found to be 6.977mg/l. Sub-lethal exposure resulted in anaemia and increased the white blood cell counts.
    Description: Includes: 11 references.
    Keywords: Aquaculture ; Pollution ; Oreochromis niloticus ; Nigeria ; Nile tilapia ; Atrazine ; Lethal ; Sub-lethal ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 197-199
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  • 2
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    Protein profile expression of Clarias gariepinus, Heterobranchus bidorsalis and their reciprocal hybrids in Southwest Nigeria (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24623 | 19325 | 2018-05-22 06:20:02 | 24623 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: Proper genetic characterization would help in the selection of suitable strains for aquaculture that could lead to production of varieties of fishes to alleviate the problem of short supply of fast growing quality fish seeds. The study was aimed at analyzing the muscle protein profiles of Clarias gariepinus, Heterobranchus bidorsalis and their reciprocal hybrids. Sixteen juveniles fish samples (comprising four samples from each mating combinations) artificially propagated and reared for sixteen weeks were analyzed electrophoreti cally. The separation of the different polypeptides of C. gariepinus, H. bidorsalis and their reciprocal hybrid were carried out using 12% Sodium dodecyl, sulphate polyacrylamide gel electrophoresis (JD SDS-PAGE). The relative concentration of individual protein bands were analyzed using Total Lab〈sup〉TM〈/sup〉 ID software. The individual protein bands in the electrophoregram were identified in relation to their molecular weights. The gel images obtained after electrophoresis were scored and subjected to cluster analysis. The lst, 2nd, 4th, 8th, 9th, 10th, and l1th bands were detected across all mating combinations. The 5th band with molecular weight (78.58 distinguishes C. gariepinus from H. bidorsalis while the 6th band with molecular weight (54.41 KDa) distincts the reciprocal hybrid Clariabranchus from Heteroclarias. The 7th and 12th bands distinguished the pure breeds from the hybrids. The 7th band was present in both hybrids-Clariabranchus (49.50 KDa) and Heteroclarias (49.77 KDa) species but absent in the pure breeds while 12th was present in the pure breeds-C. gariepinus (19.92 KDa) and H. bidorsalis (20.29 KDa) but absent in the hybrids. The cluster analysis shows a high level of genetic similarity among the mating combinations which affirms the already established monophylogenetic relatedness among the species.
    Description: Includes: 18 references.
    Keywords: Aquaculture ; Clarias gariepinus ; Heterobranchus bidorsalis ; Nigeria ; Electrophoregram ; Protein profile ; Clarias gariepinus ; Heterobranchus bidorsalis ; freshwater environment ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 224-227
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  • 3
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    Effects of various latency periods on fertilization, hatchability and survival of Clarias gariepinus (2021)
    Fisheries Society of Nigeria | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/23470 | 19325 | 2018-05-05 12:50:15 | 23470 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-14
    Description: The latency period of post-ovulation of Clarias gariepinus has been demonstrated to affect the viability of its eggs and embryos. This study has examined the effects of various latency periods on the viability of eggs, fertilization, hatchability and survival of the African catfish Clarias gariepinus. Progenies were produced using eggs successively stripped from the African catfish at 10, 12, 14, 16, 18, 20, 17, 14, 21 and 22 hours of post-ovulation. Some eggs and sperm were delayed while others were used fresh. Low survival, hatchability and fertilization rates were observed in treatments 1 and 3, while an average percentage of fertilization, hatchability and survival rates were obtained in treatments 2 and 4. High rates of fertilization and hatchability as well as a considerable rate of survival of progeny after 21days of indoor rearing was obtained in 14-hour latency period at a temperature of 24.8oC and was significantly different (P〈0.05). Therefore, any attempt to improve fingerlings production in Clarias gariepinus must consider the effects of latency period in relation to water temperature, and the best latency period achieved in this study was 14 hours.
    Description: Includes:- 4 tables.;8 refs.
    Keywords: Aquaculture ; Nigeria ; Abeokuta ; Hatchability ; Latency period ; freshwater environment ; Biological fertilization ; Hatching ; Ovulation ; Survival ; Breeding success ; Induced breeding ; Aquaculture techniques
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 326-329
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  • 4
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    Growth performance of juvenile Clarias gariepinus fed Ipomoea aquatica based diets (2021)
    FISON | Lagos (Nigeria)
    In:  http://aquaticcommons.org/id/eprint/24655 | 19325 | 2018-05-26 12:10:53 | 24655 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-07-15
    Description: A feeding trial was conducted to assess the replacement value of I. aquatica-based diet as dietary replacement of maize in the diets of C. gariepinus. Five isonitrogenous diets were formulated to contain 0% (control diet), 15% 30%, 45%, and 60% I. aquatica. Treatment was carried out in triplicate using ten C. gariepinus juvenile per replicate with mean initial weight of 9.0g. The fish at 5% body weight per day for a period of 8 weeks. The best growth response in terms of mean weight gain was obtained in 15% I. aquatica diet inclusion (35.57 ~c 3.44g), while fish fed 60% I. aquatica diet had the lowest growth response (23.80 ~c 1.18g), FCR was obtained in fish fed 60% I. aquatica (1.79 ~c 0.04), while the lowest was obtained in fish fed 15% I. aquatica. There was no significant difference (p〉0.05) in all the parameters of the treatments. The results revealed that any of the inclusion level can be used up to 60% inclusion level of I. aquatica. However, 15% inclusion level gave the best result in terms of growth.
    Description: Includes: 14 references.
    Keywords: Aquaculture ; Ecology ; Clarias gariepinus ; Nigeria ; I. Aquatica ; Dietary ingredients ; Isonitrogenous ; Experimental diets ; Inclution levels ; automation
    Repository Name: AquaDocs
    Type: conference_item , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 353-357
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  • 5
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    Fish sorting assessments of Clarias gariepinus fingerlings raised in fish tanks (2021)
    In:  http://aquaticcommons.org/id/eprint/3632 | 424 | 2011-09-29 17:04:44 | 3632 | Fisheries Society of Nigeria
    Details
    Publication Date: 2021-06-28
    Description: Fish sorting assessments of Clarias gariepinus fingerlings stocked and raised in fish tanks were undertaken for a 6-month culture period: Sorting was undertaken from the first, second, and third months of stocking the fish fingerlings while the control was not sorted at all. The sorting assessments revealed that the twice sorting of fish fingerlings stocked with a Marginal Rate of Return (MRR) of 3.44 was significantly different (p〉0.05) from those sorted once with MRR of 0.912, and three times with MRR of 2.65 respectively, thus making twice sorting most advisable for fish farmers utilizing Clarias gariepinus fingerlings for tank aquaculture
    Keywords: Aquaculture ; Nigeria ; aquaculture techniques ; fingerlings ; fish culture ; fish handling ; freshwater fish ; Clarias gariepinus
    Repository Name: AquaDocs
    Type: conference_item
    Format: application/pdf
    Format: application/pdf
    Format: 271-276
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