Keywords
fish growth
Regulation
Sand mining
Lagos Lagoon
Nigeria
Abstract
This study examined the ecological effects of sand dredging on some aspects of fisheries of Lagos Lagoon. This study was conducted between February and July, 2017 on three selected water bodies Ologe viz: Badagry Creek and Owo River. Water samples were collected monthly, from the sampling station for physico-chemistry and chlorophyll-a determination, while fish species were bought from fishermen at each sampling station for investigate of length-weight relationship and condition factors. The results five fish species were common among sampling stations; Ctenopoma petherici, Clarias gariepinus, Coptodon zillii, Ethmalosa fimbriata and Chrysichthys nigrodigitatus. Showed. The pH, turbidity, salinity, conductivity, total dissolved solids, total suspended solids, total solids, total alkalinity, free carbon dioxide, biochemical oxygen demand and ammonia exhibited significant variation (p<0.05) among the sampling stations. The turbidity, salinity, Total dissolved solid total suspended solids, and total solids were significantly (p<0.05) higher at Badagry Creek and Ologe Lagoon compared to that of River Owo, which has low sand mining activities. The majority of fish species from River Owo conformed to the typical b values of 3.1 to 3.5 indicating that the environment is favorable for fish growth and development. However, the b values of fish from Badagry Creek and Ologe Lagoon (1.4 to 1.9) indicates the opposite. Therefore, sand mining may have affected the stability of Badagry Creek and Ologe Lagoon for optimum growth of fish. There should be strict enforcement of existing laws on sand mining and new ones should be enacted to ensure sustainable sand mining in Lagos State, Nigeria.
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