Comparisons of spiny lobster Panulirus marginatus fecundity, egg size, and spawning frequency before and after exploitation

• Published in: Fishery bulletin (Washington, D.C.) Vol. 91; no. 1; pp. 1 - 7
• Main Authors: DeMartini, EE, Ellis, D M, Honda, V A
• Format: Journal Article
• Language: English
• Published: 01.01.1993
• Subjects: Marine; Panulirus marginatus; ISE, USA, Hawaii; USA, Hawaii
• ISSN: 0090-0656

Size-specific fecundities of spiny lobster Panulirus marginatus were compared for two time-periods: pre- and early exploitation or "before" (1978-81), and post-exploitation or "after" (1991). Fecundity was further evaluated within each time-period at two collection sites that represented the major lobster fishing grounds (Maro Reef and Necker Island) in the Northwestern Hawaiian Islands. Complementary data on egg size and spawning-frequency index were compared between study sites and time-periods. Study sites and time-periods had no observable effects on egg size or spawning frequency, and there was no temporal effect on fecundity at Maro Reef. Fecundities at the two sites differed, however, "after" size-specific fecundity was an estimated 16 plus or minus 9% greater than "before" fecundity at Necker Island. Observations suggest that the recent increase in fecundity at Necker Island may reflect a compensatory (density-dependent) response to greater exploitation at this site. Results are discussed in terms of evidence for density-dependent responses in other, exploited spiny lobster stocks.