IUCN Red List Assessment
Red List Category Year Assessed
Least Concern Red List Criteria Version
Reardon, M., Walker, T.I. & Francis, M.P. (SSG Australia & Oceania Regional Workshop, March 2003) Reviewer/s
Kyne, P.M. & Cavanagh, R.D. (Shark Red List Authority) Contributor/s Justification
The holocephalan Callorhinchus milii
is relatively abundant and is caught as byproduct in fisheries of Southern Australia and New Zealand. In southern Australia, commercial catch rates have been stable for the past 20 years, while fishing effort is reducing and a Total Allowable Catch (TAC) was implemented during 2002. On-board monitoring over the past 25-year period indicates the change in the number of animals caught per unit of fishing effort was not statistically significant. A three-mile closure of all Victorian waters to shark fishing provides a large refuge for the species in southern Australia. In New Zealand TACs have been in place since 1986 and the CPUE trend increased during 1989 to 2001. As a result, the total TAC increased from 619 to 1,040 tonnes over this time period. The species is most abundant off the east coast of the South Island. This fishery appears to be stable with populations likely to be above the biomass required to provide the maximum sustainable yield. The species has relatively high biological productivity; maximum age of 15 years, matures relatively early and continues to lay eggs over several weeks each year. No contraction of range or fragmentation of the population has occurred.