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Sexual maturation in captive spiny lobsters, Jasus edwardsii, and the relationship of fecundity and larval quality with maternal size

Citation

Smith, GG and Ritar, AJ, Sexual maturation in captive spiny lobsters, Jasus edwardsii, and the relationship of fecundity and larval quality with maternal size, Invertebrate Reproduction and Development, 50, (1) pp. 47-55. ISSN 0792-4259 (2007) [Refereed Article]

DOI: doi:10.1080/07924259.2007.9652225

Abstract

Reproductive and somatic parameters of southern rocklobsters, Jasus edwardsii, held captive since puerulus and wild-caught adults were examined in terms of size at onset of maturity (SOM) and fecundity, culminating in an examination of how adult size may relate to larval competency. The SOM was much smaller in captive animals (62.5 mm carapace length, CL) compared to historical fishery data and indicated that precocious maturation may be induced in captivity. During this study, the fecundity was assessed as the number of viable phyllosoma at hatch, which was ∼45% of egg estimates from the historical fishery data, suggesting either declining egg numbers in wild stocks over time or that major egg loss occurs during embryonic development The association between SOM and sexual dimorphism was examined for several morphometric parameters. In females, the SOM was concomitant with increases to the width of the 1st and 2nd abdominal segments above 62.5 mm CL, while 2nd and 3rd leg length increased disproportionately in males compared to females above 77.5 mm CL. There were significant correlations between viable fecundity and female size (r=0.92), phyllosoma size (r=0.74) and larval viability as quantified by stress indices (r = - 0.56) and LD-50 (r=0.56), indicating that larger females produce larger, more viable larvae. These physiological traits in larval, juvenile and adult animals may have an impact on fishery and aquaculture production. © 2007 Balaban.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Fisheries - Aquaculture not elsewhere classified
Author:Smith, GG (Associate Professor Gregory Smith)
Author:Ritar, AJ (Associate Professor Arthur Ritar)
ID Code:50445
Year Published:2007
Web of Science® Times Cited:7
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2007-08-01
Last Modified:2009-09-23
Downloads:0

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