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Gear Selectivity, Mortality Rate and Fluctuations in Abundance of the Pollan Coregonus autumnalis pollan Thompson in Lough Neagh, Ireland
J. P. F. Wilson
Proceedings of the Royal Irish Academy. Section B: Biological, Geological, and Chemical Science
Vol. 83B (1983), pp. 301-307
Published by: Royal Irish Academy
Stable URL: http://www.jstor.org/stable/20494424
Page Count: 7
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Lough Neagh pollan were captured monthly in trawls, draft-nets and gill-nets in 1974-8. Gill-net selectivity was estimated by direct comparison of gill-net catches with a trawl catch. Total mortality was high in 1976 and 1977, and fish older than 5+ were rare. Due to recruitment failure in 1977, the abundance of pollan over the three years of study fell markedly. Pollan were more fecund in 1971-2 than in 1977-8 in spite of their greater abundance in the former years. The fishery might be regulated as a gill-net fishery by imposing a minimum mesh size of 30mm bar to reduce the catch rate of younger pollan.
Proceedings of the Royal Irish Academy. Section B: Biological, Geological, and Chemical Science © 1983 Royal Irish Academy