Tracking the signal in year-class strength of Northeast Arctic cod through multiple survey estimates of egg, larval and juvenile abundance

Mukhina, N. V.; Marshall, C. Tara

doi:10.1016/s1385-1101(03)00046-7

Cited by 39 publications

(40 citation statements)

References 23 publications

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“…Spawning stock biomass has been commonly used as a rough approximation of egg production, and this approach in itself has come under much criticism (e.g., Marshall et al, 2003;O'Brien et al, 2003;Mukhina et al, 2003). This is a preliminary attempt to estimate viable sperm production across a time series of a fish stock.…”

Section: Discussionmentioning

confidence: 99%

Estimation of Male Reproductive Success of Marine Fisheries

Trippel¹

2003

J. Northw. Atl. Fish. Sci.

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The subject of reproductive potential of fish populations is dominated by studies on the female gender. Studies on male reproduction are relatively few, but have increased in number during the previous decade. The objectives of this contribution were to describe and quantify the reproductive traits that make up the viable sperm production of a population. Some of these reproductive traits were easily measured from wild fish (e.g., mature testes weight), and others were more easily measured on captive fish (e.g., fertilization potential and sperm motility). Results of laboratory and field studies were then integrated to generate estimates of viable sperm production of a fish stock. A number of experimental protocols have been employed over the years to assess male fertility. The strengths and weaknesses of the different experimental approaches were reviewed and appropriate recommendations given towards establishing standardized protocols. Although the review is broad in nature, and includes references to a number of marine fishes, it concentrated on exploited species that occur in the North Atlantic and Baltic Sea within the taxonomic groups gadoidae, pleuronectoidae and clupeidae (Clupeiformes). In addition, published data on male reproductive traits of species in these taxa were tabulated and summarized. The terms of interest included sex ratio, maturity state, testes weight, sperm fertilization potential (artificial fertilization and paired mating), sperm density, sperm motility and paternal effects on early life history traits.An equation for determinate spawners was described that quantifies a population's viable sperm production using data on adult body characteristics and associated quantity and quality of sperm. The equation was used to establish time series of viable sperm production for Atlantic cod (Gadus morhua) of Newfoundland and Labrador. Results indicated on average 1 600 billion viable sperm were released to produce one recruit at age 3 years but with substantial variation among years in relation to changes in stock composition and growth as well as stock size. Distinct peaks in the number of viable sperm in 1981 and 1986 corresponded to distinct peaks in the number of age 3 recruits in those same years.

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Section: Discussionmentioning

confidence: 99%

Estimation of Male Reproductive Success of Marine Fisheries

Trippel¹

2003

J. Northw. Atl. Fish. Sci.

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“…For 3 of the 5 stocks examined in our study, NEA cod, NEA haddock, and EBS walleye pollock, the abundances of earlier life stages were better predictors of recruitment strength than were the abundances of later life-history stages. Analyzing the same data for NEA cod to determine when the signal in year-class strength could first be detected, Mukhina et al (2003) reported that the largest improvement in explanatory power came when going from the spawning stock biomass to the egg stage and suggested that the lower predictive power of later life stages was caused by higher measurement error after the larval stage. According to Mukhina et al (2003), the signal in year-class strength of NEA cod was thus often determined during the earliest life-history stages (i.e.…”

Section: Predictive Value Of Larval Compared To Juvenile Abundance Inmentioning

confidence: 99%

Predicting fish recruitment from juvenile abundance and environmental indices

Stige

Hunsicker²,

Bailey³

et al. 2013

Mar. Ecol. Prog. Ser.

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Prediction of year-class strength is a critical challenge for fisheries managers. Theoretically, predictions of recruitment should be better when they are based on estimates of cohort size taken close to the age of recruitment and may improve if the effects of environmental factors that influence pre-recruit mortality are accounted for. In practice, measurement error and difficulties in establishing robust recruitment -environment relationships complicate the picture. For 5 fish stocks of 4 species in 3 ecosystems, we examined the usefulness of indices of juvenile abundance relative to larval abundance for predicting recruitment. Further, we examined whether the use of environmental covariates improved predictions. For 2 of 4 stocks with sufficient data (1 stock did not have larval data), juvenile abundance was a better predictor of recruitment compared to larval indices. For the 2 other stocks, we found that juvenile indices were not superior to larval indices, possibly because of error in the measurement of juvenile abundance. In all 5 of these stocks, regression analysis showed that inclusion of environmental correlates contributed significantly to explaining recruitment variation compared to models based on juvenile indices alone. Further, cross validation showed that forecasts of future recruitment were either improved or qualitatively unchanged by including environmental correlates. This was despite apparent nonstationarity in the recruitment -environment relationships; most of the environmental variables and pre-recruit abundance indices were significantly correlated with recruitment for only parts of the studied period. Such complex responses to environmental changes are difficult to anticipate, yet the environmental information should not be ignored altogether. FREE REE

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“…In addition, SSB is an inadequate measure of the reproductive potential of a fish stock; population fecundity parameters like total egg production and the condition of the eggs have to be taken into account (e.g. Mukhina et al 2003). Accordingly, recruitment success (number and fitness of offspring) is linked to fecundity of the parent population and thus depends on the reproductive potential of individual fish within the spawning stock (Rothschild 1986, Ulltang 1996, Trippel et al 1997, Marshall et al 1998).…”

Section: Ecological Impacts Of Climate Change: the Role Of Species-spmentioning

confidence: 99%

Cod and climate in a latitudinal cline: physiological analyses of climate effects in marine fishes

Pörtner

Bock²,

Knust³

et al. 2008

Clim. Res.

132

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Characteristics of temperature-dependent metabolic adaptation, as well as their implications for climate-dependent energy budgets, biogeography and fitness are reviewed and analysed for populations of Atlantic cod Gadus morhua in relation to findings in other fish species from northern and southern hemispheres, especially various species of eelpout (Zoarcidae). The analysis builds on the recently posited concept of oxygen-and capacity-dependent thermal tolerance in aquatic ectotherms. Mechanistic physiological studies are used to explain both functional differences between populations and current observations (such as the northward movement of cod, or the changes in seasonal abundance of eelpout due to global warming). Available data support the hypothesis that natural selection favours individuals that maximize growth and energy efficiency at the expense of ranges of thermal tolerance. The levels of energy turnover are subject to the constraints of resource availability and temperature variability. Temperature variability in the cold, such as in the sub-Arctic, causes a rise in maintenance costs at the expense of growth, but possibly in favour of motility, and thus of foraging capacity. These different trends are mirrored in higher capacities for gene expression of key enzymes involved in aerobic metabolism (during cold acclimation) in northern as compared to southern cod populations of the East Atlantic. However, detailed patterns, as well as many of the underlying mechanisms, remain underexplored, especially with respect to the suggested hierarchy of energy allocation to energy budget components.

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Tracking the signal in year-class strength of Northeast Arctic cod through multiple survey estimates of egg, larval and juvenile abundance

Cited by 39 publications

References 23 publications

Estimation of Male Reproductive Success of Marine Fisheries

Estimation of Male Reproductive Success of Marine Fisheries

Predicting fish recruitment from juvenile abundance and environmental indices

Cod and climate in a latitudinal cline: physiological analyses of climate effects in marine fishes

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