Abstract
As espécies exóticas constituem hoje em um problema exponencial de escala global e um dos principais fatores de modificações do meio ambiente e da biodiversidade de uma região. A introdução de espécies exóticas encontra-se tipicamente vinculada í s atividades de interesse sócio-econômico. As invasões têm consequências ecológicas, econômicas e sanitárias, atuando, í s vezes, de modo sinergético. O presente trabalho registra a ocorrência de Litopenaeus vannamei em várias áreas do estuário de Cananeia, Iguape e Ilha Comprida. Para avaliar a ocorrência do L. vannamei junto í pesca de Farfantepenaeus paulensis, F. brasiliensis e Litopenaeus schmitti foram realizadas 109 amostragens com rede gerival, de março de 2005 adezembro de 2013. Foram capturados 64 exemplares de L. vannamei com tamanhos e pesos médios da menor para maior espécime capturada de 1,68 para 6,30 cm e 26,70 para 31,78 g, respectivamente. Os dados não indicam que L. vannamei está proliferando na região, a ponto de ser considerado uma espécie invasora e causando problemas econômicos.
Highlights
The introduction of exotic species in the aquatic environment can cause severe consequences such as the removal, predation and exclusion of native species by competition, as well as by hybridization (WILLIAMSON, 1996), creating an impact on the ecosystem and fisheries in general
There is an imminent risk of transmitting diseases to native species of shrimp in the study area (BARBIERI & MELO, 2006). It is for these reasons that the present study seeks to report on the occurrence of Litopenaeus vannamei in the estuarine lagoon complex of Cananeia, Iguape and Ilha Comprida to make a critical assessment of the introduction of exotic species into the region and the need for greater control
In order to evaluate the use of L. vannamei for fishing for pink shrimp (Farfantepenaeus paulensis PÉREZ-FARFANTE, 1967 and F. brasiliensis LATREILLE, 1817) and white shrimp (Litopenaeus schmitti) as live bait in the region, 109 samples were taken with a type of fishing net called the Gerival (2 meter mouth in Mar Pequeno (Figure 1)
Summary
The introduction of exotic species in the aquatic environment can cause severe consequences such as the removal, predation and exclusion of native species by competition, as well as by hybridization (WILLIAMSON, 1996), creating an impact on the ecosystem and fisheries in general. L. vannamei was cultivated in excavated tanks in the estuarine lagoon complex of Cananeia, Iguape and Ilha Comprida until September 6, 2005 This fact has led to conflict between artisanal fishermen and recreational fisheries in the region, as the former (or latter?) used exotic species as live bait, leading to fishing competition with the native white shrimp (Litopenaeus schmitti, BURKENROAD, 1936). There is an imminent risk of transmitting diseases to native species of shrimp in the study area (BARBIERI & MELO, 2006) It is for these reasons that the present study seeks to report on the occurrence of Litopenaeus vannamei in the estuarine lagoon complex of Cananeia, Iguape and Ilha Comprida to make a critical assessment of the introduction of exotic species into the region and the need for greater control. The exotic species Litopenaeus vannamei (Boone, 1931) occurrence in Cananeia
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