Reproductive characteristics of the fishery important temperate demersal berycid Centroberyx gerrardi indicate greater reproductive output in regions of upwelling
AUSTRALIA SOUTHERN SHELVES
; NORTHERN BOUNDARY CURRENT
; WESTERN-AUSTRALIA
; CHRYSOPHRYS-AURATUS
; SARDINOPS-SAGAX
; CAPE LEEUWIN
; BIOLOGY
; GROWTH
; AGE
; PATTERNS
WOS学科分类:
Fisheries
WOS研究方向:
Fisheries
英文摘要:
The reproductive biology of Centroberyx gerrardi (Gunther) was investigated across similar to 2,000 km of its southern Australian distribution, encompassing different jurisdictions and varying environmental features. Greater gonad mass and prevalence of spawning fish, along with lower ratios of lengths at maturity:maximum lengths and ages at maturity:maximum ages, were identified at the western-most (Capes) and eastern-most (Great Australian Bight; GAB) regions. Across the study region, spawning peaks in summer/autumn, when water temperatures are warmest. Regional differences in potential "reproductive output," while not consistent with the eastward decline in mean monthly water temperature, may instead be related to summer upwelling in the Capes and GAB, driving greater oceanic productivity prior to peak spawning, supporting larval survival. In autumn, the prevailing southward and eastward flowing, downwelling Leeuwin Current (LC) strengthens, providing a dispersal mechanism along the west and south Australian coasts, but limiting upwelling effects. Predicted changes in environmental conditions and their potential impacts on C. gerrardi are discussed, in particular how these factors may affect recruitment to stocks and fisheries, requiring a better understanding of source-sink relationships for this species. As environmental changes occur, management strategies to sustain fish resources must adapt to spatially variable and changing reproductive output and be collaborative across jurisdictions.
1.Murdoch Univ, Sch Vet & Life Sci, Harry Butler Inst, Ctr Sustainable Aquat Ecosyst, Murdoch, WA, Australia 2.Govt Western Australia, Dept Primary Ind & Reg Dev, Western Australian Fisheries & Marine Res Labs, Perth, WA, Australia
Recommended Citation:
Coulson, Peter Graham,Norriss, Jeffery Vincent,Jackson, Gary,et al. Reproductive characteristics of the fishery important temperate demersal berycid Centroberyx gerrardi indicate greater reproductive output in regions of upwelling[J]. FISHERIES MANAGEMENT AND ECOLOGY,2019-01-01,26(3):236-248