|
|
|
wa渔政给的说法
Good years and bad years: recruitment
‘Recruitment’ is a term used by researchers to describe
the addition of crabs or fish (juvenile or of legal size) to a
population, either by reproduction or migration.
Levels of recruitment of adult crabs to WA’s blue swimmer
crab populations fluctuate considerably. A range of
environmental factors – including water temperature
variations, the relative strength of wind and current systems,
and the amount and timing of rainfall – can affect the
survival and growth rates of crab larvae and juveniles. This
in term leads to big fluctuations in the available crab harvest
from time to time.
Estuaries along WA’s west coast, including the Peel-
Harvey near Mandurah, are under pressure from rapid
population growth. This includes increases in recreational
and commercial fishing activity, urban development and
associated environmental change, which may also affect
crab recruitment. |
|
楼主: leciel95
楼主
发表于 12-8-2013 01:14:12
发表于 14-9-2013 02:25:26