Density-versus temperature-dependent growth of Atlantic cod (Gadus morhua) in the Gulf of St. Lawrence and on the Scotian Shelf

Swain, Douglas P.; Sinclair, A. F.; Castonguay, Martin; Chouinard, Ghislain A.; Drinkwater, Ken; Fanning, L. Paul; Clark, Donald S.

doi:10.1016/s0165-7836(02)00027-9

Cited by 45 publications

(29 citation statements)

References 26 publications

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“…The negative relationship between summer temperatures and cod length is counter to previous empirical studies, which have found that warmer temperatures tend to increase growth rates in Atlantic cod (8,37,38). The optimum temperature for growth (T opt.G ) of juvenile Atlantic cod is likely between 12°C and 15°C depending on size (table 2 in ref.…”

Section: Resultscontrasting

confidence: 74%

Climate and population density drive changes in cod body size throughout a century on the Norwegian coast

Rogers

Stige

Olsen

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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Understanding how populations respond to changes in climate requires long-term, high-quality datasets, which are rare for marine systems. We estimated the effects of climate warming on cod lengths and length variability using a unique 91-y time series of more than 100,000 individual juvenile cod lengths from surveys that began in 1919 along the Norwegian Skagerrak coast. Using linear mixedeffects models, we accounted for spatial population structure and the nested structure of the survey data to reveal opposite effects of spring and summer warming on juvenile cod lengths. Warm summer temperatures in the coastal Skagerrak have limited juvenile growth. In contrast, warmer springs have resulted in larger juvenile cod, with less variation in lengths within a cohort, possibly because of a temperature-driven contraction in the spring spawning period. A density-dependent reduction in length was evident only at the highest population densities in the time series, which have rarely been observed in the last decade. If temperatures rise because of global warming, nonlinearities in the opposing temperature effects suggest that negative effects of warmer summers will increasingly outweigh positive effects of warmer springs, and the coastal Skagerrak will become ill-suited for Atlantic cod.climate variation | Gadus morhua | density dependence | length distributions

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Section: Resultscontrasting

confidence: 74%

Climate and population density drive changes in cod body size throughout a century on the Norwegian coast

Rogers

Stige

Olsen

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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“…The lack of a temperature effect on growth may be surprising given that many studies have found such an effect for cod, with increased temperature leading to increased growth (Jørgensen 1992, Shelton et al 1999, Dutil & Brander 2003, Peck et al 2003, Swain et al 2003. However, other studies have found that the impact of temperature may not be so straightforward and can differ depending on the thermal history experienced by the fish (Dutil et al 1999, Rindorf et al 2008.…”

Section: Discussionmentioning

confidence: 99%

Impact of environmental temperature on Atlantic cod Gadus morhua energy allocation to growth, condition and reproduction

Morgan¹,

Rideout²,

Colbourne³

2010

Mar. Ecol. Prog. Ser.

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“…Nevertheless, it was possible to mitigate some limitations in this study, since the analyzed samples were representative and was possible to separate efficiently the overlapping of length modes".Physical environment is an essential factor in regulating marine fish populations (CUSHING, 1982). In general, growth may be influenced by several factors such as density, temperature, salinity, reproductive cycle and food availability (FREÓN;MISUND, 1999;SWAIN et al, 2003;LAPPALAINEN et al, 2005;DULCIC et …”

Section: Discussionmentioning

confidence: 99%

Growth parameters and mortality rate of the Scomber japonicus peruanus (Jordán & Hubb, 1925) along the Peruvian coast, South Pacific

2008

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A B S T R A C TThe growth parameters and the mortality rates of the Scomber japonicus peruanus (Chub mackerel) were studied based on monthly data of frequency of fork length classes obtained from commercial landings off the Peruvian coast from 1996 to 1998. The asymptotic body length and growth rate values obtained by the ELEFAN I (Electronic Length Frequency Analysis) ranged from 40.20 cm to 42.20 cm and from 0.38 to 0.39, respectively. The oscillation amplitude was 0.60; the Winter point values varied from 0.50 to 0.60 and the performance index from 2.79 to 2.84. The total mortality rate of the Chub mackerel obtained by the linearized catch curve oscillated between 1.68 and 3.35. The rate of fishing mortality varied from 1.16 to 2.78 and the exploitation rate from 0.68 to 0.84. The annual rate of natural mortality estimated by the Pauly's method ranged from 0.52 to 0.53. The results obtained allow us to conclude that the longevity of the Chub mackerel was slightly over seven years. R E S U M OOs parâmetros de crescimento e as taxas de mortalidade de Scomber japonicus peruanus (cavalinha) foram estudados a partir de dados mensais de freqüência de classes de comprimento provenientes do desembarque comercial ao longo da costa peruana no período de 1996 a 1998. Os valores do comprimento furcal assintótico e da taxa de crescimento obtido pelo ELEFAN I(Electronic Length Frequency Analysis) variaram de 40,20 cm a 42,20 cm e de 0,38 a 0,39, respectivamente. A amplitude de oscilação foi de 0,60; os valores de Winter point variaram de 0,5 a 0,6 e os do índice de performance entre 2,79 e 2,84. As taxas de mortalidade total da cavalinha obtidas pela análise da curva de captura linearizada oscilaram entre 1,68 e 3,35, sendo as variações das taxas de mortalidade por pesca e explotação de 1,16 a 2,78 e 0,68 a 0,84, respectivamente. A taxa anual de mortalidade natural estimada pelo método de Pauly variou de 0,52 a 0,53. Os resultados obtidos permitem inferir que a longevidade da cavalinha foi de pouco mais de sete anos.

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Density-versus temperature-dependent growth of Atlantic cod (Gadus morhua) in the Gulf of St. Lawrence and on the Scotian Shelf

Cited by 45 publications

References 26 publications

Climate and population density drive changes in cod body size throughout a century on the Norwegian coast

Climate and population density drive changes in cod body size throughout a century on the Norwegian coast

Impact of environmental temperature on Atlantic cod Gadus morhua energy allocation to growth, condition and reproduction

Growth parameters and mortality rate of the Scomber japonicus peruanus (Jordán & Hubb, 1925) along the Peruvian coast, South Pacific

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