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Comparison of life histories of two deep-water sharks from eastern Australia: the piked spurdog and the Philippine spurdog

Citation

Rigby, CL and Daley, RK and Simpfendorfer, CA, Comparison of life histories of two deep-water sharks from eastern Australia: the piked spurdog and the Philippine spurdog, Marine and Freshwater Research, 67, (10) pp. 1546-1561. ISSN 1323-1650 (2016) [Refereed Article]

Copyright Statement

Journal compilation copyright CSIRO 2016

DOI: doi:10.1071/MF15176

Abstract

Deep-water sharks have low biological productivity and are vulnerable to exploitation with species-specific regional life history required to enable effective management. The present study describes the life history of two squalids collected from Australia: (1) the piked spurdog (Squalus megalops) from the tropical Great Barrier Reef; and (2) the Philippine spurdog (S. montalbani) from New South Wales. Maximum observed ages for males and females were 18 and 25 years for S. megalops and 28 and 27 years for S. montalbani. Multiple growth models were all well supported and indicated very slow growth rates for both species. The tropical S. megalops population was smaller and older at maturity than previously reported temperate populations. Males were mature at 352-mm stretched total length (LST) and 12.6 years, whereas females were mature at 422 mm LST and 19.1 years. Squalus montalbani males were mature at 700 mm LST and 21.8 years, whereas females were mature at 800 mm LST and 26 years. Fecundity was lower for S. megalops than S. montalbani with two to three compared with nine to 16 embryos. Both species have a conservative life history, although in the event of overfishing the longer-lived, later-maturing and deeper-dwelling S. montalbani is likely to take longer to recover than S. megalops.

Item Details

Item Type:Refereed Article
Keywords:age, growth, reproduction
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal Physiological Ecology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
Author:Daley, RK (Mr Ross Daley)
ID Code:114677
Year Published:2016
Deposited By:Centre for Fisheries and Aquaculture
Deposited On:2017-02-23
Last Modified:2017-10-30
Downloads:0

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