Growth and population structure of the seabob shrimp Xiphopenaeus kroyeri (Decapoda: Penaeidae) on the continental shelf of Sergipe, Brazil

Abstract

This study evaluated the population structure, growth and longevity of Xiphopenaeus kroyeri in the State of Sergipe. The obtained data were compared with other populations on a latitudinal scale in order to evaluate whether the latitudinal paradigm applies to this species. Shrimp sampling took place monthly from September 2013 to August 2014, in nine stations distributed at 5, 15 and 30 m depths, using a shrimp fishery boat equipped with a ‘double rig’ net. Sexual maturity was estimated by the logistic function y = a/(1 + b*exp(-cx)), and the sex ratio was analysed with the Chi-square test. The individual growth rate was estimated using the von Bertalanffy model, and the longevity was estimated by the inverse form of this formula. A total of 6418 (3457 females and 2961 males) was analysed. The size at onset of sexual maturity was 12 mm of carapace length (CL) for males and 12.5 mm CL for females. The total sex ratio did not differ from the expected (1:1). Males exhibited higher growth coefficients (k) and smaller asymptotic growth (CC∞ = 28.74 mm, k = 0.0081 day−1) than females (CC∞ = 30.79 mm, k = 0.0058 day−1). The estimated longevity (years) was 1.55 for males and 2.15 for females. No evident latitudinal pattern was observed regarding the size at onset of sexual maturity or the growth parameters for X. kroyeri. The information found, besides contributing to the knowledge about the biology of this shrimp, can also clarify hypotheses presented in relation to the latitudinal paradigm along the Brazilian coast.

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

“…We found sexual dimorphism in the size of Xiphopenaeus spp., in which is common for species of Penaeidae (Boschi, 1969; Carvalho et al, 2015; Dall et al, 1990; Miazaki et al, 2018). The same pattern of dimorphism occurred in the four regions analyzed and was reported for the genus in previous studies from different locations on the coast of Santa Catarina State (26°S) in southern Brazil by Grabowski et al (2014), and the coast of Sergipe State (11°S) in northeastern Brazil by Silva et al (2019). Therefore, growth parameters differed between sexes too: males reached smaller sizes, showed larger growth coefficients ( k ), and lived less than females in the four regions studied.…”

“…When growth and longevity parameters are compared to more distant regions, such as the northeast coast (11°S) (Silva et al, 2019) or the south coast of the country (27°S) (Campos et al, 2011), there is still no evidence of a latitudinal pattern (Table 3; Figure 8). The estimated longevities of the studied regions were close to 2 years.…”

<b>Growth, longevity, and juvenile recruitment of the white shrimp <i>Litopenaeus schmitti </i>(Burkenroad, 1936) (Decapoda: Penaeoidea) in southeastern Brazil

“…On the coast of Pernambuco in northeastern Brazil (08°35'57"S), Silva et al (2018a) also reported seasonal recruitment, and Lugo et al (2014) reported the same in Venezuela (11°45'N). This absence of a latitudinal pattern may occur because the distinct populations of L. schmitti which are distributed along the Brazilian coast occur in areas where the water temperature is similar, as reported by Silva et al (2018b) for X. kroyeri.…”

“…Dall et al (1990) also reported that several studies using the ELEFAN routine had yielded very small k values, so it would take several years for the shrimp to reach its asymptotic length, thus contrasting with the longevity estimates. Consequently, the Peak Fit program has demonstrated greater coherence in relation to crustacean biology in estimating such values (Davanso, Taddei, Simões, Fransozo, & Costa, 2013;Simões, D'Incao, Fransozo, Castilho, & Costa, 2013;Castilho et al, 2015;Pescinelli et al, 2017;Silva, Santos, Costa, & Hirose, 2018b).…”

Sexual and ontogenetic morphometric variation in Xiphopenaeus kroyeri (Crustacea, Decapoda, Penaeidae): a new approach with linear and angular morphometric data

“…Morphological differences that determine cohorts, ontogenetic stages and sexual dimorphism in a population may be relevant information to support future studies on a taxon (Swain and Foote 1999;Turan et al 2006;Konan et al 2008Konan et al , 2010. For example, morphometric studies on prawns and shrimps have revealed populational variations (García-Dávila et al 2005;Konan et al 2008Konan et al , 2010, morphotypes (Rojas et al 2012), growth information (Jayachandran et al 1996;Kapiris 2005;Campos et al 2011;Reis et al 2017;Da Silva et al 2018), taxonomic differentiation (May-Kú et al 2006), allometric differences between fishery stocks, (Paramo and Saint-Paul 2010;Barbosa-Saldaña et al 2012), ontogenetic variations (Chow and Sandifer 1991), sexual dimorphism (Kapiris and Thessalou-Legaki 2001;Accioly et al 2013), and shape variations between fishery stocks (Bissaro and Gomes-Jr 2012) and populations (Gusmão et al 2013).…”