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Titolo:
The role of sex change, growth and mortality in Pandalus population dynamics and management
Autore:
Fu, CH; Quinn, TJ; Shirley, TC;
Indirizzi:
Bedford Inst Oceanog, Marine Fish Div, Dept Fisheries & Oceans, Dartmouth,NS B2Y 4A2, Canada Bedford Inst Oceanog Dartmouth NS Canada B2Y 4A2 mouth,NS B2Y 4A2, Canada Univ Alaska Fairbanks, Juneau Ctr Fisheries & Ocean Sci, Sch Fisheries & Ocean Sci, Juneau, AK 99801 USA Univ Alaska Fairbanks Juneau AK USA 99801 Ocean Sci, Juneau, AK 99801 USA
Titolo Testata:
ICES JOURNAL OF MARINE SCIENCE
fascicolo: 3, volume: 58, anno: 2001,
pagine: 607 - 621
SICI:
1054-3139(200106)58:3<607:TROSCG>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
OCEAN SHRIMP; SPAWNING STOCK; JORDANI; RECRUITMENT; ALASKA; GULF; AGE;
Keywords:
Pandalus; sex change; growth; mortality; population dynamics; shrimp management;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Fu, CH Bedford Inst Oceanog, Marine Fish Div, Dept Fisheries & Oceans, POB1006, Dartmouth, NS B2Y 4A2, Canada Bedford Inst Oceanog POB 1006 Dartmouth NS Canada B2Y 4A2 2, Canada
Citazione:
C.H. Fu et al., "The role of sex change, growth and mortality in Pandalus population dynamics and management", ICES J MAR, 58(3), 2001, pp. 607-621

Abstract

Sex change, growth. and mortality of Pandanus populations are important tostock management. To investigate the importance of these life history traits in setting management strategies, we performed a variety of simulatoins using a length-based model. Wa compared three populations: a Kachemak Bay. Alaska type (K_pop): a hypothetical one with the same growth but without sex change (H_pop): and a northern Barents Sea type (B_pop). The main difference between K_pop and B_pop is growth rate: K_pop has faster growth and a shorter live span, whereas B_pop lives farther north, and therefore has faster growth and greater longevity. We found that populations with sex change were more sensitive to fishing pressure. Continuous fishing was detrimentalto K pop when instantaneous fishing mortality was above 0.3. but thresholdmanagement. i.e. closing the fishery at low population level, greatly improved the population performance. B_pop, the slower-growing. longer-lived population required larger mesh sizes than K_pop. but increasing mesh size could not prevent collapse under high fishing mortality, and fishery closure under threshold management was necessary to sustain the population. Abrupt decrease of age one and two males caused populations with sex change to fluctuate in spawning biomass. Seasonality in growth and natural mortality is also pertinent to shrimp management. Given taster growth in summer, higher natural mortality in summer means fishing after spring hatching tends to result in higher cumulative yield than fishing after fall mating. and vice verse. In addition, fishing after hatching is in general mure robust to overfishing. From the simulation analyses, we concluded that both sex change andseasonality of growth and mortality of Pandalus populations should be taken into account in shrimp management. (C) 2001 International Council for theExploration of the sea..

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Documento generato il 23/09/20 alle ore 13:17:35