Reproductive biology of the spiny lobster, Panulirus Penicillatus, in the southeastern coastal waters off Taiwan
Resource
Marine Biology 151 (2): 553-564
Journal
Marine Biology
Journal Volume
151
Journal Issue
2
Pages
553-564
Date Issued
2007
Author(s)
Abstract
The reproductive biology of spiny lobster, Panulirus penicillatus, was studied based on 2,068 lobsters, ranging from 34.28 to 131.60 mm carapace length (CL), sampled in Taitung coastal waters from September 2003 to December 2004. The overall sex ratio approximated 1:1 (χ2 = 0.02, P > 0.05), but the monthly sex ratios in 2004 showed significant differences and males were predominant in sizes larger than 80 mm CL. Reproductive activity, assessed using histology, a gonadosomatic index and percentage of ovigerous females, indicated that the mature females could be found in every month and that the major spawning occurred from May to September. The presence of re-developing/re-ripe ovaries by month and size-specific spawning time suggest that larger mature females (>60 mm CL) spawn at least three times a year while smaller new mature females spawn at least once a year. For females, the estimated sizes at 50% physiological and functional maturity were (mean ± SE) 56.46 ± 0.56 mm CL and 66.63 ± 1.07 mm CL. The estimated sizes at functional maturity were between 72 and 74 mm CL for males. The number of eggs per spawning event (brood size, BS) was related to CL by the equation YBS = 2.4 × 10-3CL4.18 (r2 = 0.902, n = 12). Female lobsters with CL ranging from 60 to 80 mm made the greatest contributions to egg production because of their high brood size and active reproductive activity. A minimum legal size should be established for the fishery to protect egg production potential of lobster population in the southeastern coastal waters off Taiwan. © 2006 Springer-Verlag.
Subjects
Brood size; Ovarian development; Panulirus penicillatus; Relative reproductive potentials; Size at maturity; Spawning time; Taitung
SDGs
Other Subjects
body size; brood size; coastal water; fishery production; lobster fishery; reproductive biology; reproductive potential; sex ratio; size at maturity; spawning; Asia; Eurasia; Far East; Taitung; Taiwan; lobster; Palinuridae; Panulirus penicillatus
Type
journal article
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