Diel variation in abundance and size of the seabob shrimp Xiphopenaeus kroyeri (Crustacea, Penaeoidea) in the Ubatuba region, Southeastern Brazil

Abstract

The objective of the present study was to analyze diel variation in the abundance and size of the seabob shrimp Xiphopenaeus kroyeri in the Ubatuba region, state of São Paulo, during the year 2000. In each season of the year, collections were made in the day and at night on 9 transects at depths ranging from 2 to 40 m. The estimated shrimp amount was of 28,878 individuals. Although the catch rate was higher during the day (15,853 shrimp), this did not differ significantly from the catch at night (13,025). The catch rate was higher in daytime on most transects, but was higher at night at locations where fine and very fine sand predominated. The majority of juveniles were caught during the day. The mean size (CL) was 14.43 ± 4.02 mm for day and 14.82 ± 4.28 mm for night samples, and the difference was significant (Student's t-test, df = 2, 429, t = 2.27, p = 0.02). The largest individuals were caught during the night. None of the three models that have been proposed in the literature to account for differences in the diurnal catch pattern of penaeid species can be applied to X. kroyeri. Our results provide evidence that sediment type not only influenced the catch rate in the analyzed periods, but also determined which models might fit the behavior of this species.

Diel Variation in Abundance and Size of the South American Red Shrimp Pleoticus Muelleri (Spence Bate, 1888) (Decapoda, Solenoceridae) in the Ubatuba Region, Southeastern Brazil

“…However, the studies cited above did not find a specific difference in capture rates related to the type of sediment in the sampling area. The results of this study showed that variation in environmental parameters such as the sediment grain size and the temperature can also produce differences in capture rates, thus substantiating the studies performed by Bishop et al (2008) and Simões et al (2010). In agreement with the two studies cited above, Boschi (1989) and Costa et al (2004) observed that sediment type and temperature have been confirmed to exercise great influence on the distribution of P. muelleri.…”

“…In general, P. muelleri follows the pattern proposed by Dall et al (1990) for penaeids, i.e., most marine shrimp species remain burrowed during the day and emerge at night. Diurnal burrowing activity is common in the majority of penaeids (STONER, 1991;VANCE, 1992;BISHOP et al, 2008;SIMÕES et al, 2010).…”

“…Laboratory experiments have indicated that at least certain species of Penaeidae are much more active at night and are thus more vulnerable to capture by nets (PONTES; ARRUDA, 2005;PONTES, 2006). According to Moctezuma and Blake (1981) and Simões et al (2010), the juveniles remain not burrowed for a longer period than do the adults because their food requirements are higher as a result of their high growth rate.…”

How marine upwelling influences the distribution of Artemesia longinaris (Decapoda: Penaeoidea)?

“…This preference for fine sediment is common in most of the peneid species like Penaeus esculentus Haswell, 1879, Metapenaeus endeavouri (Schmitt, 1926 (Gribble et al, 2007), Sicyonia dorsalis Kingsley, 1878 (Castilho et al, 2008b) and A. longinaris (Costa et al, 2005b). Very fine sand enables the shrimp's strategy of burying themselves to protect against predators and thus to decrease their energetic expenditure (Ameeri & Cruz, 1998;Simões et al, 2010).…”

“…The spatial and temporal distribution of shrimps, as well as the onset at sexual maturity, growth, longevity, and spawning are affected by temperature, salinity, food availability, sediment structure and intrinsic factors (Bauer 1992;Castilho et al, 2007aCastilho et al, , 2007bCastro et al, 2005;Costa et al, 2005aCosta et al, , 2005bCosta et al, , 2007Simões et al, 2010).…”