Effects of different slipping methods on the mortality of sardine, Sardina pilchardus, after purse-seine capture off the Portuguese Southern coast (Algarve)

PloS One
Ana MarçaloJorge M S Gonçalves

Abstract

The effects of two different slipping methods on the survival, physical and physiological response of sardines, Sardina pilchardus, captured in a purse-seine fishery were investigated in southern Portugal. Sardines were collected and transferred into holding tanks onboard a commercial fishing vessel after being captured, crowded and deliberately released using two slipping procedures: standard and modified. The standard slipping procedure aggregated fish at high densities and made them "roll over" the floatline, while the modified procedure aggregated the fish at moderate densities and enabled them to escape through an opening created by adding weights to the floatline. Both slipping methods were compared with minimally harmed non-slipped sardines (sardines collected from the loose pocket of the purse seine). Survival rates were monitored in captivity over 28 days using three replicates for each treatment. The estimated survival of sardines was 43.6% for the non-slipped fish, 44.7% for the modified slipping and 11.7% for the standard slipping treatments. Scale loss indicated the level of physical impact experienced, with dead fish from the non-slipped and modified slipping technique showing significantly lower scale loss than t...Continue Reading

References

Feb 1, 1995·General and Comparative Endocrinology·Y IgerS E Wendelaar Bonga
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Jun 10, 2005·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·Raúl Laiz-CarriónJuan M Mancera
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Jul 26, 2011·Developmental and Comparative Immunology·Lluis Tort
Dec 1, 2012·Fish Physiology and Biochemistry·Pedro M GuerreiroDeborah M Power
Nov 26, 2015·Ecological Applications : a Publication of the Ecological Society of America·Graham D RabySteven J Cooke

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