Reproductive biology of ridgeback shrimpSolenocera choprai(Decapoda, Penaeoidea, Solenoceridae) off Mangalore coast, south India

Abstract

ABSTRACT:The ridgeback shrimp Solenocera choprai has emerged as one of the important commercial species in 60-100 m depth zone off Karnataka coast, India, since 1993. Studies were conducted on S. choprai to understand its reproductive biology which can help in formulating policies for management of the species. The diagnostic features of reproductive morphology of the species were studied and illustrated in detail. Based on the coloration and size of the ovary and ova diameter variations, five stages of maturity in female S. choprai were identified. The mature ova are fully yolked with diameters between 0.24 and 0.35 mm. Size at maturity (50%) has been estimated at 54.5 and 66.5 mm total length (TL) in males and females, respectively. The gonadosomatic index (GSI) showed an increasing trend according to the advancement of maturity of the ovary, and monthly mean GSI showed a positive correlation with monthly percentage of spawners. Solenocera choprai was found to be a continuous breeder with two peaks: a major peak in November and another extended peak during January-February. The estimated numbers of ova in the mature ovary were 38 532 and 133 689 in shrimps measuring 80 and 110 mm TL, respectively. A sigmoidal increase in the femaleto-male sex ratio with increase in size was noticed in the species. A c 2 -test showed that the annual distribution of females and males is not significantly different from a 1:1 ratio at the 1% level.

Secondary sexual characters and spermatophores of Solenocera agassizii (Decapoda: Solenoceridae), including a comparison with other solenocerid shrimp

“…Unlike the descriptions for the species of Solenocera from Australia (Pérez-Farfante & Grey 1980) and India (Dineshbabu & Manissery 2008), the presence of paired protuberances on the anterior part of Sternite XIII in the thelyca is always mentioned for the following American species: Solenocera acuminata Pérez-Farfante & Bullis, 1973(Pérez-Farfante & Bullis 1973, S. atlantidis Burkenroad, 1938(Pérez-Farfante & Bullis 1973, S. florea Burkenroad, 1938 (Pérez-Farfante 1988), S. geijskesi Holthuis, 1959(Pérez-Farfante & Bullis 1973, S. mutator Burkenroad, 1938(Pérez-Farfante 1988 and S. vioscai Burkenroad, 1934(Pérez-Farfante & Bullis 1973 ). However, it should be noted that in the case of S. agassizii, the protuberances of Sternite XIV always terminate in a rounded end and are not pointed as in S. acuminata, S. necopina and S. vioscai; this structure of S. agassizii is most similar to the one described for S. geijskesi (see Pérez-Farfante & Bullis 1973).…”

“…Although the petasma of solenocerid shrimp initially develops as small rudimentary bud-like projections on the first pleopods (Boschi & Angeluscu 1962, Tuma 1967, Motoh & Buri 1980, the shape of the different lobes and projections constituting the organ in the developing and adult shrimp varies considerably among species (George & Rao 1968). As the endopods increase in size during ontogeny, the cincinnulli develop into double hooks and increase in number (Boschi & Angeluscu 1962, George & Rao 1968, Motoh & Buri 1980, allowing the junction of endopods in larger specimens (Eldred 1958, Sobrino & García 2007, Dineshbabu & Manissery 2008. In addition, structure calcification, increasing number of folds, and the development of distal structures have also been described as part of the petasma's development in other penaeid species (Tuma 1967, George & Rao 1968.…”

“…Reproductive studies focusing on commercially exploited solenocerid shrimp have mainly described primary sexual characters (gonad development; e.g. Baelde 1992, Ohtomi et al 1998, Dineshbabu & Manissery 2008, Villalobos-Rojas & Wehrtmann 2011. Conversely, descriptions of secondary sexual characters have mostly been used for taxonomy purposes in solenocerid shrimp, and are valuable for identification of species in this taxon (Pérez-Farfante & Bullis 1973, Pérez-Farfante 1977, Pérez-Farfante & Boris 1982, Pérez-Farfante & Kensley 1985, Pérez-Farfante 1988.…”

Gonad development in the commercially exploited deepwater shrimp Solenocera agassizii (Decapoda: Solenoceridae) from Pacific Costa Rica, Central America

“…The development of previtellogenic oocytes and the appearance of the surrounding follicular cells associated with the loss of translucity at a macroscopic level characterize the start of the endogenous vitellogenesis phase (Baelde, 1992;Quinitio et al, 1993;Anderson et al, 1984Anderson et al, , 1985Ohtomi et al, 1998;Carbonell et al, 2006;Yamada et al, 2007;Dineshbabu and Manissery, 2008).…”

Spatial structure and morphometric relationships of the deep-sea shrimp Solenocera acuminata (Decapoda, Solenoceridae) in the Colombian Caribbean

“…The individuals were sexed, with males being identified by the presence of a petasma and females by the presence of a thelycum. The macroscopic maturity stage was determined for females using, as a reference, the five-stage scale (immature, early maturing, late maturing, mature and spent-recover) proposed for Solenocera choprai (Dineshbabu and Manissery 2008).…”