Carvalho Cássia DE, Keunecke Karina A, Lavrado Helena P
Programa de Pós-Graduação em Zoologia do Museu Nacional, Universidade Federal do Rio de Janeiro (PPGZoo/MN-UFRJ), Departamento de Biologia Marinha, Instituto de Biologia, Av. Pau-Brasil, 211, Prédio do CCS - Bloco A, Ilha do Fundão, 21949-900 Rio de Janeiro, RJ, Brazil.
Departamento de Biologia Animal, Instituto de Ciências Biológicas e da Saúde, Universidade Federal Rural do Rio de Janeiro, Rodovia BR 465, Km 7, 23897-000 Seropédica, RJ, Brazil.
An Acad Bras Cienc. 2019 Mar 18;91(2):e20180252. doi: 10.1590/0001-3765201920180252.
Farfantepenaeus brasiliensis and F. paulensis are the most exploited shrimps of SE-S Brazilian coast. Our aim was to verify if adjacent nursery areas with different environmental condition (Sepetiba and Guanabara bays, SE Brazil) influence on shrimp populations (eg, CPUE) and body shapes. Samplings were carried out during 12 months in those bays ca. 85 Km far from each other. Carapace length (CL), total body length (TL), wet weight, abdomen size and TL/CL ratio were used to analyze variations in shape through regressions. In general, F. brasiliensis was 4 to 6 times more abundant than F. paulensis. The sex ratio differed from 1:1 in F. brasiliensis in both bays, with dominance of females, largest catches occur in autumn. However, differences in size and morphology were found between bays, mainly regarding the TL/CL ratio. Shrimps in Sepetiba Bay have higher TL/CL showing a more "elongated shape" (larger abdomen) when compared to those from Guanabara Bay. Results suggest the existence of an estuary vs shrimp morphology relationship which results in differences in body shape even in spatially close areas. TL/CL ratio has proven useful for assessing shrimp populations differences and might be tested for tracking the origin of adult shrimps stocks at the coast.
巴西对虾和巴西拟对虾是巴西东南部海岸捕捞量最大的虾类。我们的目的是验证具有不同环境条件的相邻育苗区（巴西东南部的塞佩蒂巴湾和瓜纳巴拉湾）是否会对虾类种群（如单位捕捞努力量渔获量）和体型产生影响。在这两个相距约85公里的海湾进行了为期12个月的采样。通过回归分析，利用甲壳长度（CL）、全长（TL）、湿重、腹部大小和TL/CL比率来分析体型变化。总体而言，巴西对虾的数量比巴西拟对虾多4至6倍。在两个海湾中，巴西对虾的雌雄比例均偏离1:1，雌性占优势，秋季的捕捞量最大。然而，在两个海湾之间发现了大小和形态上的差异，主要体现在TL/CL比率上。与瓜纳巴拉湾的虾相比，塞佩蒂巴湾的虾TL/CL更高，呈现出更“细长的形状”（腹部更大）。结果表明河口与虾类形态之间存在关系，即使在空间上相邻的区域，也会导致体型差异。TL/CL比率已被证明有助于评估虾类种群差异，并且可能用于追踪沿海成年虾种群的来源。
