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|Title:||The spawning dynamics of snapper (Chrysophrys auratus)in northern Spencer Gulf, South Australia|
|Citation:||New Zealand Journal of Marine and Freshwater Research, 2012; 46(4):491-510|
|Richard J. Saunders, Anthony J. Fowler and Bronwyn M. Gllanders|
|Abstract:||This study investigated the inter-and intra-annual variation in the spawning dynamics of snapper (Chrysophrys auratus). Reproductive samples from northern Spencer Gulf, South Australia were collected over three seasons (2005/06, 2006/07 and 2007/08) and were analysed macro and microscopically. Spawning activity was determined by calculating estimates of spawning fraction and batch fecundities. The onset of spawning occurred in November but varied between years and corresponded with times when water temperature was between 18º C and 20º C. The length of the spawning season also differed between years. In each year the peak spawning activity occurred during December when fish spawned almost daily. Spawning frequency and relative batch size did not differ between the first two spawning seasons but, in the third season, batch size was considerably greater and spawning fractionally lower. These results are contrasted with a known recruitment of 0+ over the three years of the study.|
|Keywords:||Chrysophrys auratus; recruitment; Pagrus; Sparidae; spawning; Spencer Gulf|
|Rights:||© 2012 The Royal Society of New Zealand|
|Appears in Collections:||Earth and Environmental Sciences publications|
Environment Institute publications
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