A study was conducted on fish species composition and morphological features of five dominant fish families from the inland waters of Kebbi state, Nigeria between January and December 2017. Three major fishing communities (Argungu, Sabiyel and Yauri) were selected for the study. Fish samples were qualitatively collected from the commercial landings of the fishermen using gill nets. The analysis of the distribution of fish species were analyzed using Microsoft Excel software In total 18 fish species belonging to 10 families were identified from the inland waters of Kebbi state. Viz: Bagridae, Cichlidae, Claridae, Mormyridae, Citharacidae, Characidae, Mochokidae, Melaptaruridae, Schilbeidae and Cyprinidae. Among the 10 identified families, Bagridae (22.22%) and Mormyridae (16.66%) which accounted for four and three species respectively, were the most dominant families.
A study on the effect of different doses of Ovulin hormone suspended in saline on the breeding performance of Clarias anguillaris and Clarias gariepinus was carried out. The experiment was conducted in a 2x5 factorial experiment in a Completely Randomized Design at the Hatchery Unit of the Department of Fisheries and Aquaculture, Usmanu Danfodiyo University, Sokoto. Species and hormone dilutions constituted the factors with specie having 2 levels (C. anguillaris and C. gariepinus) and Ovulin suspended in saline at 5 levels (0%, 25%, 50%, 75% and 100%). The result showed that species levels did not significantly (P>0.05) affect the breeding performance in all the breeding performance parameters observed. However, fertilization rate, hatching rate and survival rate were significantly affected (P<0.05) by different levels of Ovulin suspended in saline, but did not have significant influence (P>0.05) on egg weight, spawning fecundity and relative fecundity. It could be concluded from this study that Ovulin suspended in saline can have significant influence on the breeding performance of African catfish.
Abstract:Kwalkwalawa is an area noted for extensive rice production and fishing activities, while Talata Mafara is a site used mainly for rice production. Soils of the two areas were taken and evaluated for potentialities of rice-cum-fish culture. Three replicate soil samples were collected in October 2004 and 2005 from three sampling sites within the study area at 0-15 cm and 15-30 cm depth. Analysis of the samples indicated that at Kwalkwalawa the soil pH was 7.35 and 7.28 for 0-15 cm and 15-30 cm depth, respectively, and 6.75 and 6.67 for Talata The soil was classified as loamy sand after fitting it into textural triangle. Results indicated the clay content at Kwalkwalawa over two seasons was stable, but at Talata Mafara it differed, even though the soil texture was the same for both seasons and sampling depths. The results showed that with some textural improvements, rice-cum-fish culture project can be undertaken in the study areas.
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