The recreational fishery in the Kosi estuarine lake system, South Africa

<strong><span style="font-size: xx-small; font-family: CharterBT-Bold;"><strong><span style="font-size: xx-small; font-family: CharterBT-Bold;"><p>The Kosi estuarine system, located in northern KwaZulu-Natal, is becoming an increasingly popular angling venue. Recreational catch card data from the National Marine Linefish System for the years 1986 to 1999 were analysed to determine total catch, catch composition, catch <strong><span style="font-size: xx-small; font-family: CharterBT-Bold;"><span style="font-size: xx-small; font-family: CharterBT-Bold;">per unit effort (CPUE), seasonality of catches and annual trends in catch composition. A total of <span style="font-size: xx-small; font-family: CharterBT-Bold;">17 families, comprising 34 species, was reported in catches of recreational anglers. </span></span></span><em><span style="font-size: xx-small; font-family: CharterBT-BoldItalic;"><em><span style="font-size: xx-small; font-family: CharterBT-BoldItalic;">Pomadasys </span></em></span></em><span style="font-size: xx-small; font-family: CharterBT-Bold;"><span style="font-size: xx-small; font-family: CharterBT-Bold;"><span style="font-size: xx-small; font-family: CharterBT-Bold;">spp., predominantly </span></span></span><em><span style="font-size: xx-small; font-family: CharterBT-BoldItalic;"><em><span style="font-size: xx-small; font-family: CharterBT-BoldItalic;">Pomadasys commersonnii, </span></em></span></em><span style="font-size: xx-small; font-family: CharterBT-Bold;"><strong><span style="font-size: xx-small; font-family: CharterBT-Bold;">was the most prominent taxon caught in terms </span></strong></span></strong><strong><span style="font-size: xx-small; font-family: CharterBT-Bold;"><strong><span style="font-size: xx-small; font-family: CharterBT-Bold;">of both numbers and mass. Seasonal trends in catch rates were observed, with more fish caught in the summer and autumn months. The catch rate fluctuated annually. Fluctuations in CPUE were closely correlated to the number of cards collected, which reflects bias in the data. Despite annual fluctuations in CPUE, </span></strong></span></strong><strong><span style="font-size: xx-small; font-family: CharterBT-Bold;"><strong><strong><span style="font-size: xx-small; font-family: CharterBT-Bold;"><span style="font-size: xx-small; font-family: CharterBT-Bold;">regression analysis revealed a slight increase in overall <span style="font-size: xx-small; font-family: CharterBT-Bold;">CPUE with time. However, CPUE for </span></span></span><em><span style="font-size: xx-small; font-family: CharterBT-BoldItalic;"><em><span style="font-size: xx-small; font-family: CharterBT-BoldItalic;">Acanthopagrus berda </span></em></span></em><span style="font-size: xx-small; font-family: CharterBT-Bold;"><span style="font-size: xx-small; font-family: CharterBT-Bold;">and </span></span><em><span style="font-size: xx-small; font-family: CharterBT-BoldItalic;"><em><span style="font-size: xx-small; font-family: CharterBT-BoldItalic;">Lutjanus argentimaculatus </span></em></span></em><span style="font-size: xx-small; font-family: CharterBT-Bold;"><strong><span style="font-size: xx-small; font-family: CharterBT-Bold;">decreased steadily since 1986. The decline of these two estuarine-dependent species may indicate that the total fishing levels are not sustainable.</span></strong></span><p> </p></strong></strong></span></strong></p></span></strong></span></strong>