Larvas de peixes e invertebrados planctÃnicos coletados com um novo modelo de armadilha de luz: Bahia de Tamandarà - PE




Larval fish and a great number of other planktonic organisms, display photobehavioral characteristics which make possible the use of artificial li-t to attract and capture them. The concept of light traps is not a new concept, and it has been used for a long time by entomologists and limnologists, but introduced to stud reef enviroment by Doherty in 1987. The equipment here presented constitutes a new model of light trap with interesting characteristics such as, low cost of production, simplicity of use and maintenance, use of recycled materiais for construction and satisfÃctory efficiency. Our sampling protocol was can-ied out during the surnrner of 2001 (January to april), in the Tamandarà Bay, state of Pemambuco. In twenty nine sampling nights 217 samples were collected, containing 3165 larvae and juvenile fish, 686 Clupeidae and Engraulidae predators and, 2650 phylossom larvae of lobsters, besides millions of others planktonic animals. Fifieen families of fish larvae and four types of unidentified Labroidei were found in the samples. This study suggests that the variability of the captures with light traps in the Tamandarà Bay is intimately related to the periodicity of the lunar phases and also that, the monthly and temporal variations of the distributions of the organisms was relatively more visible than the spatial variations, at least in the scale of this study. Relationship among the Closed Area (exclusion of fishing and tourism) and the spatial variation in the abundance of the fish lmae was not observed. This equipment, constitutes a feasible technique in the economic and the ecological point of view, for the analysis of the distribution and abundance of larval fishes, lobsters and other invertebrates, and can be useful for the acquisition of applicable information to support management actions


ictioplanctÃn larval oceanografia presetlement larvas ictioplancton oceanografia biolÃgica fish

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