current status and management of South Africa's chondrichthyan fisheries

Chondrichthyans (sharks, skates, rays and chimaeras) are captured in many marine fisheries. Management and research efforts directed at chondrichthyan fishing are often neglected because of low product value, taxonomic uncertainty, low capture rates, and harvesting by multiple fisheries. In South Af...

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Vydané v:	African journal of marine science Ročník 37; číslo 2; s. 233 - 248
Hlavní autori:	da Silva, C, Booth, AJ, Dudley, SFJ, Kerwath, SE, Lamberth, SJ, Leslie, RW, McCord, ME, Sauer, WHH, Zweig, T
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	Grahamstown Taylor & Francis 03.04.2015 Taylor & Francis Ltd
Predmet:	Bycatch Carcharias Carcharias taurus Carcharodon carcharias Chimaera Chondrichthyes Developing countries Fish conservation Fisheries Fisheries management Fisheries surveys Fishing Galeorhinus galeus gillnets Gullies harvesting industrialization LDCs Marine fish marine fisheries Mustelus mustelus Relative abundance research management shark fisheries shark trade Sharks South Africa stock assessment surveys Teeth traditional technology Triakis Triakis megalopterus uncertainty South Africa
ISSN:	1814-2338, 1814-232X, 1814-2338
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Popis
Shrnutí:	Chondrichthyans (sharks, skates, rays and chimaeras) are captured in many marine fisheries. Management and research efforts directed at chondrichthyan fishing are often neglected because of low product value, taxonomic uncertainty, low capture rates, and harvesting by multiple fisheries. In South Africa's diverse fishery sectors, which include artisanal as well as highly industrialised fisheries, 99 (49%) of 204 chondrichthyan species that occur in southern Africa are targeted regularly or taken as bycatch. Total reported dressed catch for 2010, 2011 and 2012 was estimated to be 3 375 t, 3 241 t and 2 527 t, respectively. Two‑thirds of the reported catch was bycatch. Regulations aimed at limiting chondrichthyan catches, coupled with species‑specific permit conditions, currently exist in the following fisheries: demersal shark longline, pelagic longline, recreational line, and beach‑seine and gillnet. Limited management measures are currently in place for chondrichthyans captured in other South African fisheries. Catch and effort dataseries suitable for stock assessments exist for fewer than 10 species. Stock assessments have been attempted for five shark species: soupfin Galeorhinus galeus , smoothhound Mustelus mustelus , white Carcharodon carcharias , spotted ragged‑tooth Carcharias taurus , and spotted gully Triakis megalopterus . Fishery‑independent surveys and fishery observer data, which can be used as a measure of relative abundance, exist for 67 species. Compared with most developing countries, South African shark fishing is relatively well controlled and managed. As elsewhere, incidental capture and bycatch remain challenges to the appropriate management of shark species. In 2013, South Africa's National Plan of Action for the Conservation and Management of Sharks (NPOA‑Sharks) was published. Implementation of the NPOA‑Sharks should help to improve chondrichthyan management in the near future.
Bibliografia:	http://dx.doi.org/10.2989/1814232X.2015.1044471 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23
ISSN:	1814-2338 1814-232X 1814-2338
DOI:	10.2989/1814232X.2015.1044471