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Life histories of two deep-water Australian endemic elasmobranchs: Argus skate Dipturus polyommata and eastern spotted gummy shark Mustelus walkeri
Citation
Rigby, CL and White, WT and Smart, JJ and Simpendorfer, A, Life histories of two deep-water Australian endemic elasmobranchs: Argus skate Dipturus polyommata and eastern spotted gummy shark Mustelus walkeri, Journal of Fish Biology, 88, (3) pp. 1149-1174. ISSN 0022-1112 (2016) [Refereed Article]
Copyright Statement
Copyright 2016 The Fisheries Society of the British Isles
Abstract
Two Australian endemic elasmobranchs, the Argus skate Dipturus polyommata and the eastern spotted gummy shark Mustelus walkeri, were collected from the by-catch of a prawn Melicertus plebejus trawl fishery off Queensland. Age and growth parameters were estimated from growth band counts in vertebral sections of 220 D. polyommata and 44 M. walkeri. Dipturus polyommata males and females had an observed maximum age of 10 years and reached maximum sizes of 369 and 371 mm total length (LT), respectively. Mustelus walkeri lived longer, with the oldest female aged 16 years and measuring 1050 mm stretched total length (LST), and oldest male aged 9 years and 805 mm LST. Dipturus polyommata grew relatively fast with a von Bertalanffy growth completion parameter of k = 0·208 year−1 with males reaching maturity at 4·0 years (c. 278 mm LT) and females at 5·1 years (c. 305 mm LT). Mustelus walkeri grew more slowly with k = 0·033 year−1 with males estimated to mature at 7–9 years (670–805 mm LST) and females at 10–14 years (833–1012 mm LST). Length at birth inferred from neonate D. polyommata was 89–111 mm LT while for M. walkeri it was estimated to be 273 LST based on the value of L0 from the von Bertalanffy growth model. Both species appeared to have continuous reproductive cycles and low fecundity with an average ovarian fecundity of eight follicles for D. polyommata and a litter size of five to seven pups for M. walkeri. Based on these life-history traits, D. polyommata is more resilient to fishing pressure than M. walkeri.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | age, growth, reproduction, fish, argus skate, gummy shark, Australia, elasmobranch |
| Research Division: | Agricultural, Veterinary and Food Sciences |
| Research Group: | Fisheries sciences |
| Research Field: | Fish physiology and genetics |
| Objective Division: | Environmental Management |
| Objective Group: | Marine systems and management |
| Objective Field: | Marine biodiversity |
| UTAS Author: | White, WT (Dr William White) |
| ID Code: | 118412 |
| Year Published: | 2016 |
| Web of Science® Times Cited: | 9 |
| Deposited By: | Directorate |
| Deposited On: | 2017-07-12 |
| Last Modified: | 2017-10-20 |
| Downloads: | 0 |
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