474
12 Species Case Studies
Spawning is highly synchronised and occurs at the same key spawning locations
each year. During the spawning season, spawning mostly occurs over 3–4 days
around the new, and to a lesser extent, full moon, mainly between the early afternoon and evening (Jackson et al. in press ) . Batch fecundity is size-related; a 19-cmFL female produces ~1,500 hydrated oocytes at each spawning compared with
~650,000 hydrated oocytes by a 71-cm-FL female (Mackie et al. 2009 ) .
12.12.3 Fishery and Management
Commercial line-fi shing in oceanic waters and recreational boat-based fi shing in the
gulfs have both developed due to the higher catch rates/larger catches made possible
through the targeting of spawning aggregations during austral winter. Commercial
Fig. 12.29 The main recreational fi shing areas in the inner gulfs of Shark Bay, Western Australia.
The boundaries between Denham Sound, Freycinet Estuary and Eastern Gulf approximate the
distributions of three separate inner gulf snapper stocks. Hamelin Pool is a marine nature reserve
and closed to all fi shing. The main commercial fi shing grounds for the oceanic snapper stock are
shown by the starred symbol
12 Species Case Studies
Spawning is highly synchronised and occurs at the same key spawning locations
each year. During the spawning season, spawning mostly occurs over 3–4 days
around the new, and to a lesser extent, full moon, mainly between the early afternoon and evening (Jackson et al. in press ) . Batch fecundity is size-related; a 19-cmFL female produces ~1,500 hydrated oocytes at each spawning compared with
~650,000 hydrated oocytes by a 71-cm-FL female (Mackie et al. 2009 ) .
12.12.3 Fishery and Management
Commercial line-fi shing in oceanic waters and recreational boat-based fi shing in the
gulfs have both developed due to the higher catch rates/larger catches made possible
through the targeting of spawning aggregations during austral winter. Commercial
Fig. 12.29 The main recreational fi shing areas in the inner gulfs of Shark Bay, Western Australia.
The boundaries between Denham Sound, Freycinet Estuary and Eastern Gulf approximate the
distributions of three separate inner gulf snapper stocks. Hamelin Pool is a marine nature reserve
and closed to all fi shing. The main commercial fi shing grounds for the oceanic snapper stock are
shown by the starred symbol