Using rapid assessment and demographic methods to evaluate the effects of fishing on Heterodontus portusjacksoni off far-eastern Victoria, Australia.
J Fish Biol
; 77(7): 1564-78, 2010 Nov.
Article
em En
| MEDLINE
| ID: mdl-21078019
ABSTRACT
A rapid semi-quantitative ecological risk assessment method (productivity and susceptibility analysis) indicated that, despite its low biological productivity, the Port Jackson shark Heterodontus portusjacksoni is at low risk to all fishing methods in far-eastern Victoria, Australia, under the present fishing practices, because of its low catch susceptibility. The risk to this population, however, would increase if the shark gillnet fishery operating in the region were to retain the species as a by-product. Demographic analysis indicated that the species has medium intrinsic population growth rate and potential rebound in comparison with other chondrichthyan species, juveniles have higher elasticity than mature females and both juvenile and mature females have higher elasticities than hatchlings. Because of its low biological productivity and moderate resilience to the effects of fishing, cautious management measures will be necessary to ensure the sustainable use of H. portusjacksoni if its marketing increases in the future. Information on the dynamics of a population that is valuable to provide management advice can be obtained through demographic methods, but rapid assessment methods can also provide complementary information on the effects of fishing by considering the catch susceptibility of the population to each fishing method.
Texto completo:
1
Coleções:
01-internacional
Contexto em Saúde:
2_ODS3
Base de dados:
MEDLINE
Assunto principal:
Tubarões
/
Pesqueiros
Tipo de estudo:
Risk_factors_studies
Limite:
Animals
País/Região como assunto:
Oceania
Idioma:
En
Revista:
J Fish Biol
Ano de publicação:
2010
Tipo de documento:
Article