Application of a Yield and Egg Production Model Based on Size to an Offshore American Lobster Population
作者:
MichaelJ. Fogarty,
JosefS. Idoine,
期刊:
Transactions of the American Fisheries Society
(Taylor Available online 1988)
卷期:
Volume 117,
issue 4
页码: 350-362
ISSN:0002-8487
年代: 1988
DOI:10.1577/1548-8659(1988)117<0350:AOAYAE>2.3.CO;2
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
We estimated size-specific growth, maturation, yield, and egg production per recruit for an offshore population of American lobsterHomarus americanus. The yield and egg production model explicitly considered individual variability in growth. The model also incorporated the interaction between the growth and reproductive cycles of mature females and accommodated molt-related mortality for males and females. Growth rates of offshore American lobsters considerably exceeded estimates for inshore populations; yield and egg production per recruit were correspondingly higher. Simulations indicated that yield per recruit was maximized at low levels of fishing mortality for both males and females. Inclusion of molt-dependent mortality in these simulations resulted in lower levels of yield per recruit and less convex yield curves for both sexes. At high levels of fishing mortality, changes in the predicted mean size of the catch became small, indicating that detecting increases in mortality rates from size composition data would be difficult as fishing mortality increased.
点击下载:
PDF (984KB)
返 回