| 来源类型 | Conference or Workshop Item (UNSPECIFIED)
|
| 规范类型 | 其他
|
| Maturation characteristics in Norwegian spring-spawning herring before, during, and after a major population collapse. |
| Engelhard GH; Heino M
|
| 发表日期 | 2002
|
| 出处 | ICES CM Documents 2002 - ICES Annual Science Conference, 1-5 October 2002
|
| 出版年 | 2002
|
| 语种 | 英语
|
| 摘要 | The immense Norwegian spring-spawning herring (Clupea harengus) population collapsed to the state of commercial extinction in the late 1960s, probably largely due to overfishing; the stock has fully recovered since the 1980s. It is known that the collapse strongly affected maturation characteristics. However, the long-term patterns of maturation in this stock have remained largely undescribed. Using discriminant analysis and artificial neural networks, the age at maturation for individual fish can be predicted from routine scale measurements. We applied these methods to historical data on herring scales available from 1935 up to the present, in order to (1) describe the long-term variability in both age and length at 50% maturity, and (2) compute new, revised maturity ogives for the stock over the same period with temporal resolution of one year. This new information, with improved temporal resolution, enables comparisons of maturation characteristics before, during, and after the population collapse. As a further step, in order to increase our understanding of the potential impact of commercial fisheries on the genetic composition of fish stocks, we aim to disentangle genetic from phenotypic aspects of maturation. |
| 主题 | Adaptive Dynamics Network (ADN)
|
| 关键词 | Herring
Sild
Stock development
Bestandsutvikling
|
| URL | http://pure.iiasa.ac.at/id/eprint/6698/
|
| 来源智库 | International Institute for Applied Systems Analysis (Austria)
|
| 资源类型 | 智库出版物
|
| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/132082
|
推荐引用方式
GB/T 7714 |
Engelhard GH,Heino M. Maturation characteristics in Norwegian spring-spawning herring before, during, and after a major population collapse.. 2002.
|
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
