Temporal variations in the fecundity of Arcto-Norwegian cod (Gadus morhua) in response to natural changes in food and temperature

Kjesbu, Olav Sigurd; Witthames, Peter R.; Solemdal, Per; Walker, M. Greer

doi:10.1016/s1385-1101(98)00029-x

Cited by 228 publications

(196 citation statements)

References 34 publications

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“…Nevertheless, Kjesbu et al (1991) observed in an experimental study with Atlantic cod that a significant reduction in potential fecundity due to atresia in the prespawning ovary is not very common, except for fish in very poor condition. This result was confirmed by Kjesbu et al (1998), also for spawning individuals, although a lack of contrast in condition may have led to an underestimation of the occurrence and especially the proportion of affected oocytes.…”

Section: Realised Fecunditysupporting

confidence: 59%

“…For cod from the Gulf of St. Lawrence, Lambert and Dutil (2000) demonstrated that not only the realised fecundity, but also the average egg dry weight is related to the nutritional status of the female. Kjesbu et al (1998), synthesising available information on potential fecundity of the Northeast Arctic cod stock, revealed significant positive relationships between potential fecundity and environmental temperature as well as the availability of capelin per maturing cod.…”

Section: Potential Fecunditymentioning

confidence: 97%

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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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Section: Realised Fecunditysupporting

confidence: 59%

Section: Potential Fecunditymentioning

confidence: 97%

Scientific knowledge of biological processes potentially useful in fish stock predictions

2003

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“…Robb (1982) showed that egg production and food intake were positively correlated for haddock Melanogrammus aeglefinus maintained under laboratory conditions. As for other species, such as herring, Clupea harengus (Ma et al, 1998) the medaka Oryzias latipes (Hirshfield, 1980) or cod, Gadus morhua (Karlsen et al, 1995;Kjesbu et al, 1998). For some fish species like sea bream (Sparus aurata), or Japanese sea bream (Pagrus major) the composition of the egg is quickly affected by diet in a few weeks of feeding broodstock (Watanabe et al, 1985b, Fernandez-Palacios et al, 1995Tandler et al, 1995).…”

Section: Discussionmentioning

confidence: 99%

Effect of diet (fatty acid and protein) content during spawning season on fertility, eggs and larvae quality of common porgy (Pagrus pagrus, Linnaeus 1758)

Abrehouch¹,

Ali²,

Chebbaki³

et al. 2010

ABJNA

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Spawning in captivity of two red porgy's broodstock groups (Pagrus pagrus) of the same age was studied during one season. These two broodstock groups, designed A and B, were fed with different regimes during the spawning period. A group was fed on moist pellet while (A diet content 45% proteins, 10% lipids) B group was fed on fresh fish (A diet content 48 % protein, 8.7% lipids). The total eggs collected number for A group was 22 million eggs of which 18 million were viable, fertility was 474,966 eggs kg -1 female. For B group, eggs collected number was 36 million eggs of which 31 million were viable fertility was 769,186 eggs kg -1 female. Statistically, there was a significant difference between the two groups in terms of quantity and quality of spawning and larval survivals recorded on second day after hatching and on fifth day after hatching.

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“…Cold temperatures in March delay spawning in sole, but it is not known whether recruitment is determined during the pelagic egg and larval stages, or during the early demersal stage (van der Land 1991; Kjesbu et al 1998;Rijnsdorp and Witthames 2005).…”

Section: Recruitmentmentioning

confidence: 99%

Environmental Impacts—Marine Ecosystems

Brander

Ottersen

Bakker

et al. 2016

North Sea Region Climate Change Assessment

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This chapter presents a review of what is known about the impacts of climate change on the biota (plankton, benthos, fish, seabirds and marine mammals) of the North Sea. Examples show how the changing North Sea environment is affecting biological processes and organisation at all scales, including the physiology, reproduction, growth, survival, behaviour and transport of individuals; the distribution, dynamics and evolution of populations; and the trophic structure and coupling of ecosystems. These complex responses can be detected because there are detailed long-term biological and environmental records for the North Sea; written records go back 500 years and archaeological records many thousands of years. The information presented here shows that the composition and productivity of the North Sea marine ecosystem is clearly affected by climate change and that this will have consequences for sustainable levels of harvesting and other ecosystem services in the future. Multi-variate ocean climate indicators that can be used to monitor and warn of changes in composition and productivity are now being developed for the North Sea.

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Temporal variations in the fecundity of Arcto-Norwegian cod (Gadus morhua) in response to natural changes in food and temperature

Cited by 228 publications

References 34 publications

Scientific knowledge of biological processes potentially useful in fish stock predictions

Scientific knowledge of biological processes potentially useful in fish stock predictions

Effect of diet (fatty acid and protein) content during spawning season on fertility, eggs and larvae quality of common porgy (Pagrus pagrus, Linnaeus 1758)

Environmental Impacts—Marine Ecosystems

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