出版社：Government of Western Australia / Department of Fisheries
摘要：This chapter deals with the second objective of the project:
¡°Collect information on the size of west coast reef fish in relation to depth, to assess the
proportion of undersize fish at different depths.¡±
If some undersize fish die following capture and release, the fishing mortality is higher and the
mean size at first capture lower than would be expected on the basis of the retained catches.
This affects the abundance of spawning stocks, and the sustainable yield which can be taken
by the fishery. Increasing the survival of released fish is likely to be one of the most effective
measures available to conserve reef fish stocks. This can only be done with an understanding
of the sources of release mortality and estimation of the effectiveness of techniques to reduce
that mortality, which have been investigated in Chapters 2 to 4.
However, besides improving the survival of released fish, an additional option to conserve
fish may be to reduce the actual capture rate of undersize fish. In this Chapter the relative
distribution of undersize and legal size dhufish and snapper caught by the different fishing
sectors are examined to determine if there are any spatial patterns that might be informative
for reducing the likelihood of catching undersize fish, for example, through modification of
fisher behaviour.
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