Spatiotemporal distributions of two sympatric sawsharks (Pristiophorus cirratus and P. nudipinnis) in south-eastern Australian waters
V. Raoult
A B E , V. Peddemors C , K. Rowling C and J. E. Williamson A D
+ Author Affiliations
- Author Affiliations
A Department of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia.
B School of Environmental and Life Sciences, University of Newcastle, Ourimbah, NSW 2258, Australia.
C Fisheries NSW, Sydney Institute of Marine Science, 19 Chowder Bay Road, Mosman, NSW 2088, Australia.
D Sydney Institute of Marine Science, 19 Chowder Bay Road, Mosman, NSW 2088, Australia.
E Corresponding author. Email: vincent.raoult@newcastle.edu.au
Marine and Freshwater Research 71(10) 1342-1354 https://doi.org/10.1071/MF19277
Submitted: 15 August 2019 Accepted: 19 February 2020 Published: 18 March 2020
Abstract
Sawsharks are one of the least well-known groups of sharks globally, yet they are caught in large numbers in south-eastern Australia. In this study we assessed spatiotemporal patterns of distribution of two co-occurring species of sawsharks, namely the common sawshark (Pristiophorus cirratus) and the southern sawshark (Pristiophorus nudipinnis), to guide future research in this area. To identify where the animals may occur in greater numbers, this study used the major commercial fishery datasets in the region, containing nearly 180 000 catch records from 1990 to 2017. Several general patterns were evident. Sawsharks occurred at shallower and deeper depths than previously thought, and their geographical range was larger than documented in previous studies. Depth distributions of both species overlapped, but P. cirratus appeared more common in deeper water (at depths up to 500 m), with peak common sawshark catch rates at ~400 m. Seasonal standardised catch patterns across fishing methods suggested that migrations from deeper to shallower waters may occur in the Australasian autumn and winter. The greatest concentration of sawsharks, inferred by standardised catch rates, occurred to the east and west of Bass Strait between Tasmania and mainland Australia. Although standardised catch rates of sawsharks declined in gill-net fisheries by ~30%, primarily in the Bass Strait and Tasmania, sawsharks appear to be caught at consistent rates since the 1990s, inferring a possible resilience of these sharks to current levels of fishing pressure.
Additional keywords: biomass (ecology), catch per unit effort, CPUE, depth distribution, migrations, population dynamics, Pristiophoridae, stock assessment.
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