Biology of angel sharks (Squatina sp.) and sawsharks (Pristiophorus sp.) caught in south-eastern Australian trawl fisheries and the New South Wales shark-meshing (bather-protection) program
| Autor: | Jane E. Williamson, Vincent Raoult, Victor M. Peddemors |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Ecology biology 010604 marine biology & hydrobiology Aquatic Science Oceanography biology.organism_classification Angel shark 010603 evolutionary biology 01 natural sciences Fishery Commercial fishing Sexual dimorphism Sawshark Phylogeography Squatina australis Pristiophorus nudipinnis Pristiophorus Ecology Evolution Behavior and Systematics |
| Zdroj: | Marine and Freshwater Research. 68:207 |
| ISSN: | 1323-1650 |
| DOI: | 10.1071/mf15369 |
| Popis: | Two species of angel shark (Squatina australis, S. albipunctata) and two species of sawshark (Pristiophorus nudipinnis, P. cirratus) are frequently caught in south-eastern Australia. Little is known of the biology of these elasmobranchs, despite being caught as secondary target species in large numbers. The present study collected morphometric and reproductive data from sharks caught in shark-control nets, commercial fishing trawlers and research trawlers in south-eastern Australia. All four species had female-biased sexual size dimorphism, but growth curves between sexes did not differ. Male S. australis individuals were fully mature at ~800-mm total length, male P. nudipinnis at ~900mm, and male P. cirratus at ~800mm. Anterior pectoral margins could be used to determine total length in all species. No morphometric measurement could reliably separate Squatina spp. or Pristiophorus spp., although S. albipunctata over 1000-mm total length had larger eyes than did S. australis. |
| Databáze: | OpenAIRE |
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