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, M. J.

doi:10.1006/jmsc.1996.0200

Cited by 33 publications

(27 citation statements)

References 16 publications

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“…For example, the mean length-atmaturity (14.9 cm TL) in our study in the north-western Mediterranean was much lower than those reported for warmer water populations inhabiting the Canarian Archipelago (18.3 cm TL) (Pajuelo et al, 2003b) and the Gulf of Tunisia (15.33-16.13 cm TL) (Chakroun-Marzouk & Ktari, 2006;Fehri-bedoui & Gharbi, 2008). The size-atmaturity of fish is known to vary spatially and temporally and is usually closely related to total population abundance over the life of a cohort, with cohorts maturing at a smaller size when population size is low (Rijnsdorp, 1993;Morgan & Bowering, 1997;Morgan & Colbourne, 1999). Furthermore, water temperature has been assumed to affect only body growth and so the effects of temperature on maturation and reproductive effort appear to be indirect via the optimization of life-history traits in fish populations (Charnov & Gillooly, 2004).…”

Section: Discussionmentioning

confidence: 99%

Climate-driven changes in life-history traits of the bastard grunt (Pomadasys incisus) in the north-western Mediterranean

2014

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This study evaluates the influence of sea water temperature on the life-history traits of the thermophilic bastard grunt Pomadasys incisus along the Catalan coast. We compared two key traits of this species, condition and reproduction, from populations in two separate areas with different thermal regimes: the Gulf of Roses (cold area) and the Ebre Delta (warm area). Specimens were collected monthly from each area between 2010 and 2012. The results were also compared with those given in the literature from sites where the species is more common, i.e. the southern Mediterranean and eastern Atlantic. Our findings indicate that, compared to the populations in warmer environments, the population inhabiting the colder waters appears to be in significantly poorer condition and there is some deviance in their life-history traits: egg size and quality being traded-off for higher egg numbers; lower lengths at maturity and alterations to spawning phenology. A certain degree of plasticity in life-history traits may favour the process of expansion and establishment of this thermophilic species into newly available but colder habitats of the north-western Mediterranean under a scenario of climate change.

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Section: Discussionmentioning

confidence: 99%

Climate-driven changes in life-history traits of the bastard grunt (Pomadasys incisus) in the north-western Mediterranean

2014

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“…typical snapshot studies). Indeed, a lack of information of levels of variability in demographic parameters (including rates of growth and mortality) across a species distribution could confound biological-based fisheries assessments and management plans (Morgan & Bowering 1997, Ruttenberg et al 2005, Jakobsen et al 2009). …”

Section: Maturity and Fishery Considerationsmentioning

confidence: 99%

Depth interactions and reproductive ecology of sympatric Sillaginidae: Sillago robusta and S. flindersi

Gray¹,

Barnes²,

Meulen³

et al. 2014

quat. Biol.

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“…11). There were very few catches of Greenland halibut at depths less than 200 m. Most of the Greenland halibut caught on the Flemish Cap were immature because few fish were larger than 60 cm (Alpoim et al, MS 2002), the lower end of the range of L 50 values reported for females sampled near the Cap (Morgan and Bowering, 1997).…”

Section: Collocation Of Cod and Plaicementioning

confidence: 99%

“…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). The summer depth distributions of cod populations located within the general latitudinal range of the Flemish Cap tend to be shallow.…”

Section: Introductionmentioning

confidence: 99%

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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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

Cited by 33 publications

References 16 publications

Climate-driven changes in life-history traits of the bastard grunt (Pomadasys incisus) in the north-western Mediterranean

Climate-driven changes in life-history traits of the bastard grunt (Pomadasys incisus) in the north-western Mediterranean

Depth interactions and reproductive ecology of sympatric Sillaginidae: Sillago robusta and S. flindersi

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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