Developmental rate, fecundity and egg size in Atlantic salmon, Salmo salar L.

Thorpe, J. E.; Miles, M.S.; Keay, D.S.

doi:10.1016/0044-8486(84)90030-9

Cited by 239 publications

(199 citation statements)

References 25 publications

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“…Concerning the second explanation, there are several factors that could lead to high variance of mortality among families, including time of hatching (eg Einum and Fleming, 2000), location of redds (eg Lisle and Lewis, 1992) and egg size (eg Thorpe et al, 1984). However, we see no obvious reason why these factors should be more important in Findhu Glen Burn than in Dollerup Mllebaek.…”

Section: An Explanation For Discrepancies Between Localities?mentioning

confidence: 45%

Kin-biased distribution in brown trout: an effect of redd location or kin recognition?

Carlsson

Olsén

Hansen³

et al. 2003

Heredity

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A wide range of animals have been reported to show kinbiased behaviours, such as reduced aggressiveness and increased food sharing among relatives. However, less is known about whether wild animals also associate with relatives under natural conditions, which is a prerequisite to facilitate kin-biased behaviours and hence kin selection. We tested, by means of microsatellite polymorphism, correlations between pair-wise relatedness and pair-wise metric distance in wild brown trout (Salmo trutta L.) under natural conditions in two streams. Our data show that young-of-theyear as well as older trout found close together also had a higher genetic relatedness in one of the two streams, whereas no relationship was found in the other stream. Very few half and full siblings were found in the second stream and under these conditions it is unlikely that kin-biased behaviours will receive positive selection. We discuss the underlying mechanisms for the observed structure and we specifically address the issue of whether the grouping of related individuals could reflect dispersal from the same spawning redds, or if it reflects active association with relatives, possibly conferring kin-selected advantages.

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Section: An Explanation For Discrepancies Between Localities?mentioning

confidence: 45%

Kin-biased distribution in brown trout: an effect of redd location or kin recognition?

Carlsson

Olsén

Hansen³

et al. 2003

Heredity

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“…This contrasts to the findings of other studies; an increase in body weight has accompanied by an improvement in egg number of S. richardsonii of Kasmir, India (Gandotra et al, 2009) and rainbow trout (Gall, 1975;Mulmi et al, 2010). Thorpe et al (1984) have advocated that egg production varies among individuals and populations of fish species due to differences in age and size. According to Kraus et al (2000) the fecundity of individual fish of the same size drawn from the same spawning population within the same spawning season shows considerable deviation due to differential growth of gonads.…”

Section: Discussionmentioning

confidence: 99%

Studies on gonadosomatic index, fecundity and hatchability of domesticated stock of asala Schizothorax richardsonii (Gray) from Nallu River of Lalitpur District

Wagle

2015

Our Nature

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The present work embodies studies on the reproductive capacity of captive stock of asala Schizothorax richardsonii collected from Nallu River of Lalitpur district. Gonadosomatic index (GSI) estimates ranged from 3.08±0.9% in May to 26.55±1.8% in November. Positive correlation (r=0.667) was found between egg size and GSI. The egg size (2.7 to 2.9 mm) in October and November was significantly (P<0.01) larger than the eggs measured in other months. Based on peak GSI level, S. richardsonii spawned by manual stripping in two breeding season i.e. winter (October-November) and summer (MachApril) in Godawari (1500 masl). Mean incubation period of fertilized eggs was 259 h and 248 h during winter and summer season at 14.2 to17.5 o C and 14.5 to15.5 o C water temperature, respectively. Percent hatching rates of eggs ranged between 38 to 90% and were not significantly different (P>0.05) between breeding seasons. Overripe eggs obtained during winter season breeding (16.5%) were significantly higher (P<0.01) than the summer season breeding (3.6%). This suggests that more frequent observation of the spawner is necessary during winter season for recognizing their appropriateness to ovulation.

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“…Some authors use the percentage of body mass to total mass as an index of development to predict first feeding at 97% body wet mass (Thorpe et al, 1984). Yet, fry in the wild might start feeding in the gravel (GustafsonMarjanen and Dowse, 1983) and early emerging fry have externally visible yolks (Garcia de Leaniz et al, 2000).…”

Section: Maternal Outbreeding Effectsmentioning

confidence: 99%

Multigenerational hybridisation and its consequences for maternal effects in Atlantic salmon

et al. 2013

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Outbreeding between segregating populations can be important from an evolutionary, conservation and economical-agricultural perspective. Whether and how outbreeding influences maternal effects in wild populations has rarely been studied, despite both the prominent maternal influence on early offspring survival and the known presence of fitness effects resulting from outbreeding in many taxa. We studied several traits during the yolk-feeding stage in multigenerational crosses between a wild and a domesticated Atlantic salmon (Salmo salar) population up to their third-generation hybrid in a common laboratory environment. Using cross-means analysis, we inferred that maternal additive outbreeding effects underlie most offspring traits but that yolk mass also underlies maternal dominant effects. As a consequence of the interplay between additive and dominant maternally controlled traits, offspring from first-generation hybrid mothers expressed an excessive proportion of residual yolk mass, relative to total mass, at the time of first feeding. Their residual yolk mass was 23-97% greater than those of other crosses and 31% more than that predicted by a purely additive model. Offspring additive, epistatic and epistatic offspring-bymaternal outbreeding effects appeared to further modify this largely maternally controlled cross-means pattern, resulting in an increase in offspring size with the percentage of domesticated alleles. Fitness implications remain elusive because of unknown phenotype-by-environment interactions. However, these results suggest how mechanistically co-adapted genetic maternal control on early offspring development can be disrupted by the effects of combining alleles from divergent populations. Complex outbreeding effects at both the maternal and offspring levels make the prediction of hybrid phenotypes difficult.

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Developmental rate, fecundity and egg size in Atlantic salmon, Salmo salar L.

Cited by 239 publications

References 25 publications

Kin-biased distribution in brown trout: an effect of redd location or kin recognition?

Kin-biased distribution in brown trout: an effect of redd location or kin recognition?

Studies on gonadosomatic index, fecundity and hatchability of domesticated stock of asala Schizothorax richardsonii (Gray) from Nallu River of Lalitpur District

Multigenerational hybridisation and its consequences for maternal effects in Atlantic salmon

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