Reproductive aspects of teleosts captured as part of the fauna accompanying the seven-beard shrimp fishery, Xiphopenaeus kroyeri at Praia do Perequê, Guarujá-SP K. R.O. Cordeiro, R. S. Vilão, D. M. Araujo, A A Almeida, J. L. Santos, M. M. Rotundo

Abstract

Trawling aimed at capturing shrimp in tropical regions is known to be the fishing practice with the largest capture of accompanying fauna, which can change the structure of populations, as well as the trophic relationship between species. Therefore, it is of great importance for the management of fishing resources, studies that aim to understand the reproductive development of species captured as accompanying fauna. The present study sought to analyze reproductive aspects of Teleostei captured as accompanying fauna of the seven-beard shrimp fishery, on Perequê beach, Guarujá-SP. Two samplings were carried out (Spring and Summer) using a local fishing vessel, equipped to capture seven-beard shrimp. In the laboratory, the fish were identified and measured individually in terms of total length (TL) using an ichthyometer (accuracy of 1 mm) and weighed with the aid of an analytical balance (accuracy of 0.1 g). The stage of gonadal macrodevelopment was determined based on color, transparency, vascularization, visualization of oocytes and size of the gonads, being classified as: I (Immature), II (Maturation), III (Mature) and IV (Spawned). A classification of ontogenetic development stage (EDO) was also carried out, based on the maximum total length described (CTd), where: juvenile (less than 1/3 of CTd), subadult (between 1/3 and 2/3 of CTd ) and adult (greater than 2/3 of CTd). In total, 28 species were captured, 15 in spring and 22 in summer, totaling 338 and 296 specimens respectively. Only 10 species ( Anchoa filifera, Dules auriga, Haemulopsis corvinaeformis, Isopisthus parvipinnis, Macrodon atricauda, ​​Micropogonias furnieri, Nebris microps, Ophichthus gomesii, Paralonchurus brasiliensis, Stellifer rastrifer ) had specimens that were not classified in the immature stage, corresponding to 10.63% of the specimens analyzed (10.34% in summer and 0.29% in spring); stage II corresponded to 8.26%, III to 1.92% and IV to 0.45%. The EDO characterized the presence of 37.87% of juveniles, 45.64% of subadults and 16.49% of adults. Based on both gonadal development and EDO, we can observe the dominance of immature specimens captured by this type of fishing in the study area. This highlights the importance of the area as a feeding/growing place, as well as the need for adequate fisheries management on site.