Effect Of Ph On The Growth Performance Of <i>Heterobranchus Bidorsalis</i> (♂) X <i>Clarias Gariepinus</i> (♀) Hybrid Juveniles

Abstract

Twelve plastic basins each filled with 6 litres of dechlorinated tap water at pH 6 7 (control), 7 5 and 8 such that each pH treatment was replicated three times in a Latin square design were used for the study. The tanks were randomly stocked with 10 four-week-old Clarias gariepinus (♀) x Heterobranchus bidorsalis (♂) hybrid juveni es (mean we ght 3.32 ± 0.05 g) and fed 30.25% crude protein diets for five weeks. Fish growth was measured by weighing the juveniles every week and the weight differences, specific growth rate (SGR) and food conversion ratio (FCR) determined. F sh raised at pH treatment 7.0 recorded sign f cantly higher we ght ga n (P < 0 05) than other pH treatments We ght ga n of fish ra sed at pH 6.0 was however not different (P > 0 05) from that of fish raised on pH 8.0 treatment. There was significant dif erence (P < 0.05) in the SGR of the juveniles raised at pH 6 and pH 8. There was no s gnificant difference (P > 0.05) between the SGR of f sh ra sed at pH 7 and pH 7.5 bu there was s gnificant difference between the SGR of fish raised at pH 7 and fish raised at other treatments. Fish showed reduced growth when raised at pH 6 and pH 8 and positive growth when raised at pH 7 and 7.5 though there was no significant d fference (P > 0 05) in FCR o fish cultured at all pH treatments. Our results showed that the optimal pH range or rais ng the hybrid cat ish juveni es was between 7.0-7.5 pH.

Temperature effects on the opercular respiratory rates of Clarias anguillaris fingerlings reared under Laboratory conditions in Minna, Nigeria

“…BOD concentrations recorded from all the treatments were also within the recommended range (1.00-5.00mg/L) for aquatic organism (CIESE, 2009). Similarly, the pH values of Clarias anguillaris fingerlings from all the treatments were within the tolerance range of 6.00 -8.00 documented for juveniles of Heterobranchus bidorsalis and Clarias gariepinus (Ivoke et al, 2007). The reduction in the ammonia concentration of the control was expected because Krishnamoorthy et al (2008) noted that ammonia excretion or concentration increased with increasing temperature in Alepes djidaba fingerlings showing that degradation of protein for energy was more at higher temperatures (30 0 C to 34 0 C).…”

Genotoxicity evaluation of Chlorfenapyr in exposed freshwater African catfish Clarias gariepinus using micronucleus test

“…Catfishes are also able to endure a wide range of pH balances (Hecht et al 1988;Van der Waal, 1998). However, fishes raised at pH of 7 gained significant weight higher than that of 6 and 8 (Ivoke et al, 2007). In this study, C. gariepinus endured and survived within the different groups with the pH range of 7.73 -8.16.…”

Toxicity of crude extract of <i>Terminalia superba</i> sawdust to <i>Clarias gariepinus<i/> (Burchell 1822)

“…Certain environmental factors play a significant role in varying degrees in the growth and survival of the catfish species (Ivoke et al, 2007). Naturally, the majority of species have a spectrum of physiochemical tolerance that is clearly defined.…”