Population biology of the commercially exploited shrimp Artemesia longinaris (Decapoda: Penaeidae) in an upwelling region in the Western Atlantic: comparisons at different latitudes

Abstract

This study characterized the population biology of the dendrobranchiate penaeid shrimp Artemesia longinaris Spence Bate, 1888, focusing on population structure, sexual maturity, reproductive period and recruitment, and comparing reproductive parameters of a different populations along western South Atlantic..Samples were collected monthly from March, 2008 to February, 2010 in Macaé, northern coast of Rio de Janeiro State, Brazil, a region influenced by the Cabo Frio upwelling. There was a significantly higher percentage of females and with larger sizes than males. Both carapace length and sexual maturity in Macaé were similar to the dimensions found in populations in the South of the continent (Argentina). Reproductive females were present in all months, with main peaks during winter and summer. Recruitment was also continuous, with peaks, usually one to two months after the appearance of reproductive females, after the reduction of the bottom temperature values of water. These data suggest that November to January would be the appropriate months for legal off-season, due to the higher intensity of spawning females and juveniles during this period. A comparação latitudinal dos parâmetros reprodutivos, não confirma o paradigma de que tamanho do corpo e a maturidade sexual das fêmeas são menores em regiões tropicais e aumentam em direção às maiores latitudes, reforçando a hipótese da influência e importância da ACAS na dinâmica reprodutiva de A. longinaris na região The results of this study contribute to the understanding of the biology of A. longinaris, and could also be a reference to monitor this important fishery resource and consequent legal off-season. Furthermore, this population located at the northern limit of the species distribution is a source of highly relevant comparison for population studies in other areas.Keywords: Dendrobranchiata, sex ratio, recruitment, reproductive biology, shrimp fishery. Biologia populacional do camarão explorado comercialmente

Population dynamics of Atlantic seabob Xiphopenaeus kroyeri (Decapoda: Penaeidae) off the state of Sergipe, north-eastern Brazil

“…Length-associated sexual dimorphism is common in X. kroyeri , with females reaching larger size (Branco, 2005; Santos et al ., 2013; Lopes et al ., 2014; Castilho et al ., 2015). Other penaeids follow the same pattern: Farfantepenaeus subtilis (Silva, 2016), F. brasiliensis and F. paulensis (Leite Jr & Petrere Jr, 2006), and Artemesia longinaris (Sancinetti et al ., 2015). This reflects a reproductive strategy, as larger size for females allows for larger gonads, higher fertility and production of more eggs (Gab-Alla et al ., 1990).…”

The influence of upwelling on the diversity and distribution of marine shrimp (Penaeoidea and Caridea) in two tropical coastal areas of southeastern Brazil

“…Artemesia longinaris has continuous recruitment off Macaé coast (Sancinetti et al, 2015). On the other hand, Castilho et al (2007), in a 5.5-year study in Ubatuba, found juveniles in low numbers during almost all months over the entire study period and interpreted recruitment as episodic, since there was no apparent correlation between the percentages of mature females and immature individuals.…”

Ecological distribution of Nematopalaemon schmitti and Exhippolysmata oplophoroides (Crustacea: Caridea) near an upwelling area off southeastern Brazil

“…Sancinetti et al (2014Sancinetti et al ( , 2015 showed that the environmental conditions (temperature and salinity) in the Macaé region differ from those that are usually found in tropical regions. As a result of the influence of the Cabo Frio upwelling, the low mean temperatures and the high nutrient concentrations throughout the year create conditions resembling the cool-temperate southern part of the continent (Sancinetti et al, 2015).…”