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    Differences among basic biological parameters in a population of Chokka squid Loligo vulgaris reynaudii (Cephalopoda: Loliginidae) sampled by three methods (1994)
    Taylor & Francis
    In:  South African Journal of Marine Science, 14 . pp. 281-286.
    Details
    Publication Date: 2020-11-09
    Description: A large, discrete aggregation of squid was sampled at short intervals by means of jigging, midwater trawling and purse-seining. Differences among basic parameters of the population (e.g. length frequency) indicate that jigging is a more selective, and therefore biased, method of sampling than midwater trwaling or purse-seining. This has important consequences for stock assessments that take commercial catches into account. The selectivity curve indicates that squid of mantle lenghts (ML) 28-33cm are over-represented (in terms of the situation in the population) in fisheries conducted by jigging and that squid 〈26 and 〉34cm ML are under-represented if purse-seine results are considered to be representative of the population.
    Type: Article , PeerReviewed
    Format: text
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