Seasonal distribution of American plaice on the northern Grand Banks

Morgan, M. J.; Brodie, WB

doi:10.3354/meps075101

Cited by 19 publications

(16 citation statements)

References 14 publications

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“…The seasonal movements of plaice on the Grand Bank have not been as clearly demonstrated. Morgan & Brodie (1991) found that Grand Bank plaice avoided areas of very low temperature in the winter, and there are some indications from fisheries that these plaice move into deeper (warmer) waters in the winter . However, tagging studies have indicated that Grand Bank plaice are rather sedentary (Pitt 1969, Morgan 1996.…”

Section: Discussionmentioning

confidence: 99%

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Sex-specific temperature distribution in four populations of American plaice Hippoglossoides platessoides

Swain¹,

Morgan²

2001

Mar. Ecol. Prog. Ser.

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In the American plaice Hippoglossoides platessoides, the sexes differ in size at age in most populations, with females being larger. Because of the links between growth, ration and temperature, differences in temperature selection might be expected between the sexes in species with dimorphic growth, with the sex with the higher growth rate selecting higher temperatures. Temperature selection has also been predicted to be density-dependent in fishes, with fish occupying colder temperatures at higher levels of abundance. We examined these aspects of temperature selection in 4 populations of American plaice: the southern Gulf of St. Lawrence population and 3 populations off Newfoundland (Labrador and NE Newfoundland, Grand Bank and St. Pierre Bank). Throughout the 1970s and most of the 1980s plaice occupied cold water relative to that available in all of the areas surveyed. In all 4 populations, females tended to occupy warmer water than males. Differences between the sexes in temperature selection and in length at age both tended to be greatest in the southern Gulf population during this period. However, there was no correspondence among populations in these differences in the early 1990s, when distribution of the Grand Bank and St. Pierre Bank populations shifted sharply into warm water and the difference in temperature distribution between the sexes increased dramatically in these populations. These shifts to warmer water may be related to density-dependent effects on temperature preference. There was a strong negative relationship between the temperatures occupied by plaice and their relative abundance in the 3 Newfoundland populations but not in the southern Gulf population. Densities appear to have remained higher in the southern Gulf population than in the Newfoundland populations, suggesting that density-dependent effects on temperature preference only occur when densities fall below some threshold level.

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Section: Discussionmentioning

confidence: 99%

“…This makes temperature one of the key determinants of habitat quality for fishes (Fry 1971, Reynolds & Casterlin 1979. Numerous studies have demonstrated relationships between temperature and the distribution of fishes (Scott 1982, Mahon et al 1984, Rose & Leggett 1989, Morgan & Brodie 1991.…”

Section: Introductionmentioning

confidence: 99%

Sex-specific temperature distribution in four populations of American plaice Hippoglossoides platessoides

Swain¹,

Morgan²

2001

Mar. Ecol. Prog. Ser.

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“…There are three populations of American plaice living (i) off the east and south coasts of Newfoundland, Labrador, and Northeast Newfoundland (Northwest Atlantic Fisheries Organization, NAFO, Divisions 2J3K), (ii) on the Grand Bank (NAFO Divisions 3LNO), and (iii) on St Pierre Bank (NAFO Division 3Ps). Although there are seasonal movements of plaice in the study area (Morgan and Brodie, 1991), tagging indicates that the fish do not undertake long-distance movements (Morgan, 1996). In particular, the three populations investigated here are thought to be distinct, with little or no movement between them (Bowering et al, 1996;Bowering et al, 1998).…”

Section: Methodsmentioning

confidence: 99%

Maturation of Newfoundland American plaice (Hippoglossoides platessoides): long-term trends in maturation reaction norms despite low fishing mortality?

Heino

Morgan

Dieckmann

2005

ICES Journal of Marine Science

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U. 2005. Maturation of Newfoundland American plaice (Hippoglossoides platessoides): long-term trends in maturation reaction norms despite low fishing mortality? e ICES Journal of Marine Science, 62: 56e64.To interpret long-term trends in age and size at maturation, new statistical methods have recently been devised for estimating probabilistic maturation reaction norms based on data collected for the management of fisheries. Here we apply these methods to three Newfoundland stocks of American plaice (NAFO Divisions 2J3K, 3LNO, 3Ps) and report a clear long-term shift in the maturation reaction norms of these stocks towards maturation at younger age and smaller size. Theory predicts that such trends could result from fishing acting as a selective force, inducing evolutionary changes in the life histories of exploited populations. Matching long-term trends in maturation reactions norms have already been documented for several stocks that have experienced high fishing pressures (Gulf of Maine and Georges Bank cod, Northeast Arctic cod, North Sea plaice). Our results add a new dimension to these earlier findings: since fishing pressures for two stocks of Newfoundland plaice (2J3K and 3Ps) have been relatively low, our results imply that fishing is likely to result in the evolution of life histories even when fishing mortality is low, or that natural mortality has played an important role in determining selective pressures in these populations. Both options suggest that conditions for rapid life-history evolution in exploited stocks are less restrictive than previously appreciated.

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“…Plaice are also distributed within this depth range during winter and are most abundant at depths of 200 to 400 m with few individuals found at 550 to 728 m (Bowering and Brodie, 1994). In both summer and winter, plaice are most abundant at depths of 100 to 200 m on the northern Grand Banks (Morgan and Brodie, 1991). Although plaice have been found in the deeper waters of the Flemish Pass (Iglesias journal.nafo.int et al, 1996), there is no evidence of mixing between the Flemish Cap and Grand Banks populations (Morgan and Bowering MS, 2004).…”

Section: Introductionmentioning

confidence: 95%

Density-dependent changes in the spatial distributions of Atlantic Cod (Gadus morhua), American Plaice (Hippoglossoides platessoides), and Greenland Halibut (Reinhardtius hippoglossoides) on the Flemish Cap during 1988-2002

Hendrickson¹,

Vázquez²

2005

J. Northw. Atl. Fish. Sci.

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The Flemish Cap is an isolated bank located east of the Grand Banks in the Northwest Atlantic Ocean. Research bottom trawl surveys of the Flemish Cap have been conducted in July by the European Union since 1988. Data from these surveys were used to assess changes in the spatial distributions of Atlantic cod (Gadus morhua), American plaice (Hippoglossoides platessoides), and Greenland halibut (Reinhardtius hippoglossoides) during 1988-2002. Kriging and indices of collocation and co-occurrence indicated that cod and plaice distributions have a high degree of overlap and that density-dependent range contraction of both stocks occurred during a time when Greenland halibut, a more common inhabitant of deep water, exhibited range expansion into shallow water on the Cap. However, the timing and locations of these distributional changes were such that little overlap occurred between the distributions of Greenland halibut and either cod or plaice. The range expansion of Greenland halibut was also density-dependent and primarily attributable to young fish (ages 1 and 2 from the 1994 and 1995 year-classes) which prefer shallow water. The range contractions of cod and plaice have persisted since the mid-1990s, and despite fishing moratoria implemented for plaice in 1994 and for cod in 1999, neither stock has shown signs of recovery. Biological and stock assessment implications of these distribution changes are discussed in relation to the lack of recovery.

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Seasonal distribution of American plaice on the northern Grand Banks

Cited by 19 publications

References 14 publications

Sex-specific temperature distribution in four populations of American plaice Hippoglossoides platessoides

Sex-specific temperature distribution in four populations of American plaice Hippoglossoides platessoides

Maturation of Newfoundland American plaice (Hippoglossoides platessoides): long-term trends in maturation reaction norms despite low fishing mortality?

Density-dependent changes in the spatial distributions of Atlantic Cod (Gadus morhua), American Plaice (Hippoglossoides platessoides), and Greenland Halibut (Reinhardtius hippoglossoides) on the Flemish Cap during 1988-2002

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