Preliminary estimates of age, mortality, growth, and reproduction in the hiatellid clamPanopea zelandicain New Zealand
作者:
PaulA. Breen,
Claire Gabriel,
Trish Tyson,
期刊:
New Zealand Journal of Marine and Freshwater Research
(Taylor Available online 1991)
卷期:
Volume 25,
issue 3
页码: 231-237
ISSN:0028-8330
年代: 1991
DOI:10.1080/00288330.1991.9516475
出版商: Taylor & Francis Group
关键词: Panopea;clam;geoduc;geoduck;aging;growth;mortality;reproduction;fishery
数据来源: Taylor
摘要:
Samples of the hiatellid clamPanopea zelandicawere taken from commercial catches near Nelson, New Zealand, where a new fishery developed in 1988. Ages were estimated by counting internal growth rings seen on acetate peels taken from polished and etched sections of the umbo region. Although the estimated ages are not validated, they are based on a validated technique for a similar species in North America, and they provide a preliminary examination of growth and mortality characteristics of this species. Maximum ring count was 34. Growth in shell length appeared rapid to age 10, then slowed. Natural mortality rate appeared to be around 0.20. All individuals examined in a sample taken in March appeared to have spawned recently and were in the redeveloping stages of gametogenesis. Sex ratio was not significantly different from 1:1.
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