Can simple condition indices be used to monitor and quantify seasonal changes in the energy reserves of cod (<i>Gadus morhua</i>)?

Lambert, Yvan; Dutil, Jean‐Denis

doi:10.1139/f96-149

Cited by 332 publications

(290 citation statements)

References 27 publications

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“…The variability of the gastrointestinal cytosolic metal concentrations between spawning (April/May) and post-spawning period (September), might reflect differences in fish nutritional processes, which arise due to increased water temperature, food availability and reproduction related physiological changes in April/May period (Clements and Raubenheimer 2006). As already stated, it can be supported by higher Fulton condition indices, in the chub sampled in April/May (Tables 2 and 3), which reflect the energy reserves and give the information about the recent feeding activity (Lambert and Dutil 1997).…”

Section: Metal Bioaccumulation In the Chub Intestinesupporting

confidence: 60%

“…Therefore, it can be hypothesized that the observed increase of all measured metals in the gill cytosol of chub in April/May sampling was the consequence of higher metabolic and feeding rates in the spring period than autumn (Dragun et al 2007). It could be further supported by generally higher spring than autumn Fulton condition indices (Tables 2 and 3), which reflect the energy reserves and give the information about the recent feeding activity (Lambert and Dutil 1997).…”

Section: Metal Bioaccumulation In the Chub Gillsmentioning

confidence: 81%

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Metal Bioavailability in the Sava River Water

Dragun

Marijić

Vuković³

et al. 2014

The Handbook of Environmental Chemistry

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Metals present one of the major contamination problems for freshwater systems, such as the Sava River, due to their high toxicity, persistence, and tendency to accumulate in sediment and living organisms. The comprehensive assessment of the metal bioavailability in the Sava River encompassed the analyses of dissolved and DGT-labile metal species of nine metals (Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) in the river water, as well as evaluation of accumulation of five metals (Cd, Cu, Fe, Mn, and Zn) in three organs (liver, gills and gastrointestinal tissue) of bioindicator organism, fish species European chub (Squalius cephalus L.). This survey was conducted mainly during the year 2006, in two sampling campaigns, in April/May and September, as periods representative for chub spawning and postspawning. Additionally, metal concentrations were determined in the intestinal parasites acanthocephalans, which are known for their high affinity for metal accumulation. Metallothionein concentrations were also determined in three chub organs, as a commonly applied biomarker of metal exposure. Based on the metal concentrations in the river water, the Sava River was defined as weakly contaminated and mainly comparable with unpolluted rivers, which enabled the analyses of physiological variability of metal and metallothionein concentrations in the chub organs, as well as establishment of their constitutive levels.

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Section: Metal Bioaccumulation In the Chub Intestinesupporting

confidence: 60%

Section: Metal Bioaccumulation In the Chub Gillsmentioning

confidence: 81%

Metal Bioavailability in the Sava River Water

Dragun

Marijić

Vuković³

et al. 2014

The Handbook of Environmental Chemistry

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“…Pronounced fluctuations in nutritional condition of cod in Canadian waters led to the initiation of experiments on the impact of starvation on mortality in comparison to condition indices monitored in the field (Lambert and Dutil, 1997a). Especially during the spawning season, some cod in the wild population were obviously in a condition corresponding to those deceased in the experiments (Fig.…”

Section: Starvation As a Cause Of Mortalitymentioning

confidence: 99%

Scientific knowledge of biological processes potentially useful in fish stock predictions

2003

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SUMMARY: Based on an extensive review of available knowledge, several sources of information have been identified as potentially useful in fish stock predictions. They refer to a variety of biological processes of importance for stock dynamics, e.g. growth, maturation and egg production as well as early and juvenile life stage survival and subsequent recruitment, for which examples are given. Environmental variables impacting these processes were derived, ranging from simple statistical exploratory analyses to complex process studies for various stocks in different sea areas. Causal relationships are understood to varying degrees and in several cases the identified variables may only be taken as proxies for processes not investigated in detail yet. Besides the explanatory power of relevant variables, their predictability and related predictive time frames are of major importance for a potential application in stock predictions. These criteria in particular may hamper implementation in the foreseeable future in several cases. However, the information may still be highly relevant for a) hindcasting stock developments that are so far not fully understood, b) defining stock projection scenarios for simulation of different fishery management strategies under varying environmental conditions and considering species interactions and c) elucidating areas of future research to further enhance our predictive capabilities.

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“…Equation 2 was developed for northern Gulf of St. Lawrence cod having a LCI between approximately 1 and 8% (see Lambert and Dutil (1997a) for further details) and has been applied to NA cod . In contrast with the equation given in Lambert and Dutil (1997a), eq.…”

Section: Liver Energy Contentmentioning

confidence: 99%

“…Because the liver is the primary storage site of lipid energy in gadoids (Kjesbu et al 1991), the database constitutes a highly resolved record of seasonal and interannual changes in surplus energy. Given that the lipid fraction of the liver is nonlinearly related to the LCI (Lambert and Dutil 1997a;Aupunsson 1999), the LCI database can also be used to estimate the energy content of cod livers .…”

Section: Introductionmentioning

confidence: 99%

Reconstructing the stock-recruit relationship for Northeast Arctic cod using a bioenergetic index of reproductive potential

Marshall¹,

Yaragina²,

Ådlandsvik³

et al. 2000

Can. J. Fish. Aquat. Sci.

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Correlation and simulation analyses suggest that, for the Northeast Arctic (NA) cod stock, the total lipid energy (TLE (kJ)) contained in the livers of mature females is proportional to total egg production, making TLE a potential predictor of recruitment. Accordingly, the TLE of NA cod was estimated for a 51-year time period , using estimates of numbers at length derived from virtual population analysis, modelled values of proportion mature and weight at length, and observed values of the liver-condition index. A significant linear relationship between TLE and recruitment to age 3 was observed. The temporal trend in TLE suggests that the reproductive potential of the NA cod stock has been in decline since the mid-1970s. A multiple-regression model that included TLE, mean temperature, and mean alongshore wind stress as independent variables explained approximately 43% of the variation in recruitment. Reconstructing stock-recruit relationships using more sensitive measures of reproductive potential is the first step in resolving environmental effects on recruitment and in developing biological reference points that are more effective in stock conservation.Résumé : Des analyses de corrélation et de simulation suggèrent que l'énergie lipidique totale (TLE (kJ)) contenue dans le foie des femelles à maturité de la population de morues du nord-est de l'Arctique (NA) est proportionnelle à la production totale d'oeufs; la TLE est donc un critère potentiel de prédiction du recrutement. C'est pourquoi nous avons calculé les TLE de la population NA de morues pour une période de 51 ans en nous servant d'estimations tirées de populations virtuelles des nombres de poissons dans les différentes classes de longueurs, d'estimations par modélisation des proportions d'individus matures et des masses à chacune des longueurs et d'observations des coefficients de condition du foie. Il existe une relation linéaire statistiquement significative entre les TLE et le recrutement jusqu'à l'âge 3. L'évolution au cours des ans de la TLE laisse croire que le potentiel reproducteur de la population NA décline depuis le milieu des années 1970. Une analyse de régression multiple, qui utilise la TLE, la température moyenne et le stress éolien moyen le long des côtes comme variables indépendantes, explique environ 43% de la variation du recrutement. L'établissement de meilleures corrélations entre les stocks et le recrutement à l'aide d'indicateurs plus sensibles du potentiel reproducteur est un premier pas vers l'évaluation des effets de l'environnement sur le recrutement et vers l'établissement de repères biologiques plus efficaces pour la conservation des stocks.[Traduit par la Rédaction] 2442Marshall et al.

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Can simple condition indices be used to monitor and quantify seasonal changes in the energy reserves of cod (Gadus morhua)?

Cited by 332 publications

References 27 publications

Metal Bioavailability in the Sava River Water

Metal Bioavailability in the Sava River Water

Scientific knowledge of biological processes potentially useful in fish stock predictions

Reconstructing the stock-recruit relationship for Northeast Arctic cod using a bioenergetic index of reproductive potential

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