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Embryonic and Larval Development of Reciprocal Crosses between Clarias gariepinus (Burchell, 1822) and Clarias jaensis (Boulenger, 1909) in West Cameroon

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Agricultural Sciences 2024年第8期15卷 848-863页

作者： Justin Ntsoli Félix Meutchieye algrient nana towa Donatien Bishakabalya Lwendje Minette Eyango Tabi Tomedi Biotechnology and Bioinformatics Research Unit Department of Animal Science University of Dschang FASA Dschang Cameroon Department of Forestry Faculty of Agronomy and Agricultural Sciences University of Dschang Dschang Cameroon Institute of Fisheries and Aquatic Sciences of the University of Douala Douala Bassa

Establishing intraspecific breeding and hybridization programs and determining genetic variability are two important issues for aquaculture. However, interspecific hybridization to improve growth and feeding efficiency is limited. For this purpose, the embryonic and larval development of reciprocal crosses of Clarias gariepinus (Burchell, 1822) and Clarias jaensis (Boulenger, 1909) were studied under laboratory conditions. The fertilization rate varied from 63.33% to 92%, while the hatching rate ranged from 55.68% to 76% with the highest value in hybrids ♀Cg × ♂Cj. Crosses between ♀Cj × ♂Cj, ♀Cg × ♂Cj and ♀Cj × ♂Cg had embryonic stages similar to those of the pure sib ♀Cg x ♂Cg. All crosses, however, had different timing for the various embryological stages. Hatching occurred at 32 h 15 min and 38 h for ♀Cj × ♂Cj and ♀Cj × ♂Cg, and 23 h and 23 h 30 min, respectively, for ♀Cg × ♂Cg and ♀Cg × ♂Cj. However, both crosses produced viable larvae until the first external feeding. The external morphological features of the larvae were completely formed by the 10th day after hatching. The body forms of the crosses at this time were indistinguishable from the pure sib. This study thus laid the groundwork for further comparative studies on hybrid performance and characterization.

关键词： Embryonic Development Larval Development Interspecific Hybridization Clarias gariepinus Clarias jaensis

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Farming Features of African Bonytongue Fish Heterotis niloticus in Cameroon, Central Africa

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Open Journal of Animal Sciences 2023年第2期13卷 232-248页

作者： Jeanne Wikondi Ema Patrick Jolly Ngono algrient towa nana Felix Meutchieye Minette Eyango Tabi Tomedi Department of Genetics and Biostatistics School of Veterinary Medicine and Sciences The University of Ngaoundere Ngaoundere Cameroon Applied Hydrobiology and Ichthyology Research Unit The University of Dschang Dschang Cameroon Department of Animal Science Biotechnology and Bioinformatics Research Unit The University of Dschang Dschang Cameroon Institute of Fisheries and Aquatic Sciences of the University of Douala Douala-Bassa Cameroon

The characterization of African bonytongue Heterotis niloticus fish farming was conducted in the Bi-modal agro-ecological zone of Cameroon from January to May 2021, Thirty-two fish farmers were interviewed and SPSS 6.2 Version was used to analyse the data. The results showed that the majority of fish farmers (81%) are men above 51 years, all of whom are Christians with more than fifty percent of them married. About 43% of them have university level education, and more than 6% of them considered the farming of Heterotis niloticus as their main income-earning activity. The main objective of Heterotis niloticus farming is sales (50%) and the uses (56%) of waged labour. A majority of the farmers produced reared African bonytongue in a polyculture system and 65% of them raised Heterotis niloticus in derivation ponds.

关键词： Aquaculture Characterization African Bonytongue Cameroon Central Africa

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