Distribution of commercial flatfishes in the Newfoundland-Labrador region of the Canadian Northwest Atlantic and changes in certain biological parameters since exploitation

Bowering, W. R.; Brodie, William

doi:10.1016/0077-7579(91)90042-y

Cited by 57 publications

(30 citation statements)

References 24 publications

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“…There also appears to have been a change in the distribution of the species with a movement of fish into the Flemish Pass area (border of Northwest Atlantic Fisheries Organization (NAFO) Divisions 3L and 3M, Anon, 1994). Maturity-at-age and size are known to vary in fishes, both as population size changes (Pitt, 1975;Bowering, 1989;Bowering and Brodie, 1991;Rijnsdorp, 1993;Fox, 1994), and over a species' geographic range (Bowering, 1983;Rijnsdorp, 1989;Walsh, 1994). Given recent changes in distribution and population size, trends in maturity-at-age and size in Greenland halibut might be expected.…”

Section: Introductionmentioning

confidence: 96%

Temporal and geographic variation in maturity at length and age of Greenland halibut (Reinhardtius hippoglossoides) from the Canadian north-west Atlantic with implications for fisheries management

Morgan

1997

ICES Journal of Marine Science

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Section: Introductionmentioning

confidence: 96%

Temporal and geographic variation in maturity at length and age of Greenland halibut (Reinhardtius hippoglossoides) from the Canadian north-west Atlantic with implications for fisheries management

Morgan

1997

ICES Journal of Marine Science

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“…Like many flatfish species, the sexes differ in size at age in most populations, with females being larger (Bowering & Brodie 1991). Because of the links between growth, ration and temperature, differences in temperature selection might be expected between the sexes in species with dimorphic growth.…”

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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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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“…In most of the stocks, males mature at a smaller size and younger age than females, and often the lifespan of males is shorter than that of females. Differences in the length and age at 50% maturation are especially pronounced in the flatfish stocks (Bowering and Brodie, 1991;Burnett et al, 1992;O'Brien et al, 1993;Morgan and Colbourne, 1999;Walsh and Morgan, 1999), but also occur in many gadoid stocks (Templeman et al, 1978;Beacham, 1983a,b,c;O'Brien et al, 1993, Trippel et al, 1997, grenadier stocks (Atkinson, 1995;Murua and Motos, 2000) and redfish stocks (Ni and Sandeman, 1984;Mayo et al, 1990). Earlier maturation in males than in females and potentially higher male mortality affect the composition of the spawning stock by sex and age (Jakobsen and Ajiad, 1999).…”

Section: Discussionmentioning

confidence: 99%

“…For most gadoids and flatfish stocks, substantial temporal variation in maturity ogives has been reported, which reflect density-dependent growth changes related to fishery exploitation and environmental influences (e.g. Templeman et al, 1978;Bowering and Brodie, 1991;Morgan and Colbourne, 1999;OBrien, 1999;Saborido-Rey and Junquera, 1999). Consequently, whenever possible, time series using annual or temporally discrete maturity ogives should replace knife-edge or constant maturity ogives.…”

Section: Discussionmentioning

confidence: 99%

Available Information for Estimating Reproductive Potential of Northwest Atlantic Groundfish Stocks

Tomkiewicz¹,

Morgan²,

Burnett³

et al. 2003

J. Northw. Atl. Fish. Sci.

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The availability of data to improve indices of stock reproductive potential was reviewed for 42 Northwest Atlantic groundfish stocks comprising gadoids, flatfishes, redfishes and grenadiers. For many of the stocks, information on population parameters such as stock size and size/age composition estimates exists for three or more decades. Data on fish age, weight, maturity and sex ratios in the population have also been extensively collected, often allowing for establishment of time series of annual data that could be used for assessing spawning stock biomass and female spawning stock. However, possibilities for estimating stock potential egg production are constrained by scarcity of fecundity data. Data on fish condition, which can be useful in developing fecundity models, were seldom collected in earlier times, but have increased in recent decades. A data richness index, combining information about data quantity and quality, ranked most gadoid stocks as "data comprehensive" with a high proportion of stocks possessing some fecundity information. Flatfish stocks generally were "data moderate" owing to slightly shorter time series of data, while redfish and grenadier stocks in general were "data restricted". Published studies linking aspects of reproductive potential with parental characteristics and/or recruitment have become more frequent as "data richness" has improved for many stocks, but generally the prevalence of such studies remains low.

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Distribution of commercial flatfishes in the Newfoundland-Labrador region of the Canadian Northwest Atlantic and changes in certain biological parameters since exploitation

Cited by 57 publications

References 24 publications

Temporal and geographic variation in maturity at length and age of Greenland halibut (Reinhardtius hippoglossoides) from the Canadian north-west Atlantic with implications for fisheries management

Temporal and geographic variation in maturity at length and age of Greenland halibut (Reinhardtius hippoglossoides) from the Canadian north-west Atlantic with implications for fisheries management

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

Available Information for Estimating Reproductive Potential of Northwest Atlantic Groundfish Stocks

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