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| Weight-length relationships, Condition factor and Hepatosomatic index of goby fish Acentrogobius nebulosus and Asterropteryx semipunctata in coastal ecosystems of Zanzibar.
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Shaib S. Mnemba,, Saidi S. Bakari and Haji M. Haji
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Abstract:
Weight-length relationships, Condition factor and Hepatosomatic index of 480 mangrove gobies (Acentrogobius nebulosus and Asterropteryx semipunctata) were investigated. Fish samples were caught using shrimp and mosquito nets during the low tides. The regression coefficient "b" was determined by using TW = aTLb, condition factor by CF = 100TW/TL3 and Hepatosomatic index by HIS = 100LW/TW. The Acentrogobius nebulosus had regression coefficient "b" of 3.1154 and Asterropteryx semipunctata was 2.9744. Both Acentrogobius nebulosus (t -test, p < 0.05) and Asterropteryx semipunctata (t -test, p < 0.05) had significantly positive allometric growth compared to isometric regression coefficient. The overall mean condition factor for Acentrrogobius nebulosus was 1.265±0.137 and in Asterropteryx semipunctata was 1.297±0.078 depicting good fish condition. The HSI in Asterropteryx semipunctata was significantly higher than in Acentrogobius nebulosus (t-test, p < 0.05) contrary to HSI values across the sampling points (ANOVA, p > 0.05). The values of regression coefficients "b", CF and HSI in gobies provides an impression that the marine and coastal ecosystems of Zanzibar are promising to Zanzibar blue economy as they could support fish biomass production. However, the authorities need to consider protection of marine ecosystems health and function for the sustainable blue economy.
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