Temporal variations in biomass and size of seabob shrimp Xiphopenaeus kroyeri (Heller, 1862) (Decapoda: Penaeoidea) on the southern coast of São Paulo state, Brazil

Abstract

Xiphopenaeus kroyeri (Heller, 1862) is the third most common species caught by fi shing boats in the state of São Paulo, Brazil and production of this shrimp in the Cananéia region located on the southern coast of this state ranks second in the nation. Th e aim of this study was to investigate the temporal variation of the total biomass and size of X. kroyeri and analyze this variation against environmental factors in order to suggest some information about the best periods to fi sh this species. Samples were caught monthly from four sampling stations in Cananéia between July 2012 and June 2014 using a fi shing boat equipped with ott er-trawl nets. Temperature and salinity were monitored using a multiparameter probe, and sediment samples were also taken using a Van Veen-type gripper for particle size analysis. Th e shrimp were weighed, quantifi ed, and carapace length was measured (mm). In general, the highest total biomass values were recorded when the fi shery was closed in the southeast and south regions, and the highest catch of smaller individuals was also observed during this period. In contrast, in November 2013 the fi shing is permitt ed and high biomass composed of large individuals was observed. Th e monthly biomass showed a positive relationship with sediment texture, because this species prefers very fi ne sediments to burrow as a defense against predators. keY wordsAbundance, closed season, fi shery, Penaeidae, weight. Miazaki et al.2

Growth parameters, longevity, and mortality of the seabob shrimp Xiphopenaeus spp. (Decapoda: Penaeidae) in four important fishing regions of southeastern Brazil

“…The offseason shrimp fishery, from March 1st until May 31th (IBAMA, 2008), is the only protection strategy that aims to reduce fishing pressure in the Southeast and Southern Brazilian regions. Previous studies have indicated that the offseason period has also benefited seabob shrimp (Heckler et al, ,2013, 2014; Miazaki et al, 2016). However, the offseason period in the Southeastern and Southern regions was designed to protect juvenile pink shrimp ( Farfantepenaeus spp.)…”

Variation in size distribution of juvenile pink shrimps Farfantepenaeus brasiliensis and F. paulensis in the estuarine-adjacent ocean area of Cananéia, south-eastern coast of Brazil

“…The closed season has provided favourable results in some regions of Brazil. According to studies carried out in the Cananéia region, as well as Babitonga Bay (Santa Catarina state, 26°S) and Santos Bay (São Paulo state, 24°S), the highest abundance of juvenile and reproductive females of Xiphopenaeus kroyeri (Heller, 1862) coincided with months when fishing is prohibited (Heckler et al ., 2013; Grabowski et al ., 2016; Miazaki et al ., 2016). Thus, these individuals are not being captured during this period, favouring the maintenance of the population stock.…”

A pesca do camarão-sete-barbas na área marinha costeira do Porto de Santos-SP e adjacências.

“…Pôde ser observado, através dos mapas da distribuição da CPUE estimada por krigagem e do gráfico da CPUE média dentro das diferentes áreas, que nos anos de 2009 e 2010 a abundância da espécie foi semelhante entre as áreas de despejo da dragagem e de fundeio de embarcações, enquanto nos anos de O camarão-sete-barbas é uma espécie que possui como áreas preferenciais locais com sedimentos finos e ricos em fragmentos vegetais (COSTA et al, 2007, HECKLER et al, 2014MIAZAKI et al, 2016). Assim, regiões costeiras próximas a desembocaduras de estuários, como a área marinha costeira ao largo do porto de Santos, são consideradas habitat preferenciais para alimentação e crescimento da espécie (CASTRO et al, 2005, NAKAGAKI;NEGREIROS-FRANSOZO, 1998).…”