POPULATION BIOLOGY OF SEABOB-SHRIMP Xiphopenaeus kroyeri (Heller, 1862) CAPTURED ON THE SOUTH COAST OF PERNAMBUCO STATE, NORTHEASTERN BRAZIL

Abstract

A B S T R A C TThis paper aims to describe the population dynamics and to evaluate the stock of the seabob-shrimp Xiphopenaeus kroyeri on the coast of Pernambuco. Sampling was carried out between August/2011 and July/2012 in Sirinhaém, southern coast of Pernambuco. A total of 1201 individuals were analyzed, 673 females and 528 males. Total length (Lt) of females varied from 4.5 to 13.5 cm while the Lt of males ranged between 4.0 and 11.0 cm. The relationship between the Lt and carapace length and Lt and total weight showed negative allometry (males, females and pooled sexes). The slope of the curve "b" was statistically different between males and females for both relationships. Females mature with 8.90 cm. Asymptotic length L∞ was lower for males than for females (12.26 to 14.79 and 10.72 to 11.5 cm, respectively), K was similar between sexes (1.00-2.04 and 1.00-2.63 cm/year-1 respectively) as well as the longevity and size at 1st capture (1.50 to 1.97) years and 7.9 to 8.9 cm for males and females, respectively). The results indicate that X. kroyeri in the region is not overexploited for males, however considering females and pooled sexes the stock is near to being fully exploited. R E S U M OEste trabalho tem por objetivo descrever a dinâmica populacional e avaliar o estoque do camarão sete-barbas Xiphopenaeus kroyeri do litoral de Pernambuco. As coletas foram realizadas entre os meses de agosto/2011 a julho/2012 em Sirinhaém, litoral sul de Pernambuco. Foram analisados 1201 exemplares, sendo 673 fêmeas e 528 machos. Comprimento total (CT) das fêmeas variou de 4,5 a 13,5 cm enquanto o CT dos machos variou entre 4,0 e 11,0 cm. As relações entre o CT e comprimento da carapaça e o CT e peso total apresentaram alometria negativa (machos, fêmeas e sexos agrupados). O declive da curva "b" foi estatisticamente diferente entre machos e fêmeas para ambas relações. Fêmeas maturam com 8,90cm. O comprimento assintótico L∞ foi menor para os machos do que para as fêmeas (10,72-11,5 e 12,26-14,79 cm respectivamente), o K foi similar entre sexos (1,00-2,04 e 1,00-2,63cm/ano-1 respectivamente) assim como a longevidade e tamanho de 1ª captura (1,50-1,97anos e 7,9 -8,9 cm para machos e fêmeas, respectivamente). Os resultados indicam que o estoque de X. kroyeri na região não se encontra sobreexplorada para os machos, entretanto considerando as fêmeas e sexos agrupados o recurso se encontra próximo do limite máximo de exploração.

Reproductive cycle and size at first sexual maturity of the white shrimp Penaeus schmitti (Burkenroad, 1936) in northeastern Brazil

“…The target species (Penaeus subtilis, Xiphopenaeus kroyeri, and P. schmitti) caught by trawlers in the south coast of Pernambuco, are either close or at maximum exploitation rates (Lopes et al, 2014;Silva, 2015b). This fishery is hence increasingly vulnerable in the future due to the lack of adequate regulatory legislation in the study area.…”

“…In northeast Brazil, approximately 100,000 people depend directly or indirectly on the fishery of these crustaceans for their living (Santos et al, 2006). However, no effective measures for the regulation of shrimp trawling are available now in Pernambuco, in contrast with other Brazilian states, where there is regulatory legislation (Lopes et al, 2014).…”

Population structure, size at first sexual maturity, and feeding ecology of Conodon nobilis (Actinopterygii: Perciformes: Haemulidae) from the coasts of Pernambuco, north-eastern Brazil

“…The CCRF recommends that the entire catch should be managed in an ecologically sustainable manner; thus, a regulation for this area should be established considering the main species involved (target and bycatch). Previous studies in the region have shown that the bulk of the catch of the shrimp fishery in Pernambuco shares the same feeding ground and season of reproduction (e.g., between October and March) (Lopes et al 2014, 2017, 2018, Silva Júnior et al 2015, Eduardo et al 2018b) and a closed season could be established during the austral summer. In addition, the application of BRD (e.g., fisheye, grid and square mesh) used to exclude fish and other small bycatch from the trawl (Broadhurst 2000, Eayrs 2007, Larsen et al 2017) might be a good conservation tool.…”

Population structure and reproductive biology of Haemulopsis corvinaeformis (Perciformes, Haemulidae) in the south coast of Pernambuco, northeastern Brazil

“…Previous studies in the region have shown that most of the catch (bycatch and target) of the shrimp fishery in Pernambuco occurs in the same area and share the same reproduction season, i.e. between October and March (Lopes et al, 2014(Lopes et al, , 2017Silva et al, 2015aSilva et al, ,b, 2016. Hence, the establishment of Marine Protect Areas (MPA) or a fishery-closing period should improve the conservation of the species and marine habitats exploited by this fishery in Pernambuco.…”