
TY  - JOUR
A1  - Williams, H 
A1  - Schaap, AH 
T1  - Preliminary results of a study into the incidental mortality of sharks in Gill-nets in two Tasmanian Shark Nursery Areas
JF  - Marine and Freshwater Research
JO  - Mar. Freshwater Res.
Y1  - 1992
VL  - 43
IS  - 1
SP  - 237
EP  - 250
KW  - 
UR  - https://doi.org/10.1071/MF9920237 
N2  - Since the early 1960s, certain sheltered bays and estuaries around Tasmania have been  designated shark nursery areas, where the taking of either the school shark (Galeorhinus galeus)  or the gummy shark (Mustelus antarcticus) has been prohibited. Recent assessments of  Australian stocks of school and gummy sharks indicate that they are close to collapse,  and the management of the fishery has come under review. With respect to shark nursery areas,  concern has focused on the potential rate of incidental mortality of sharks caused by recreational  gill-net fishing and poaching. In 1990, a study was begun in Frederick Henry Bay and Norfolk Bay,  the largest proclaimed shark nursery areas in Tasmania, to estimate recreational net-fishing effort  and incidental captures of sharks. School sharks were caught in waters deeper than 5 m; gummy  sharks and dogfish were caught at all depths. The diversity and relative abundance of shark species  increased with depth, whereas the diversity of teleosts decreased with depth. Most captured school  and gummy sharks were between 1+ and 3+ years of age.  Preliminary estimates of potential incidental mortality demonstrate that gill-netting in depths greater  than 5 m may be a significant source of mortality for both species. 
ER  -

