Does mortality select size or growth potential in young sockeye salmon (Oncorhynchus nerka)? A simulation based on otolith - fish size relationships

@article{Meekan1998DoesMS,
  title={Does mortality select size or growth potential in young sockeye salmon (Oncorhynchus nerka)? A simulation based on otolith - fish size relationships},
  author={M. Meekan and D. Ryan and J. Dodson and S. Good},
  journal={Canadian Journal of Fisheries and Aquatic Sciences},
  year={1998},
  volume={55},
  pages={1674-1681}
}
There is conflicting evidence on the role of size-selective mortality in the demography of populations of young sockeye salmon (Oncorhynchus nerka). A previous field study suggested that increases in mean fork length and otolith size at emergence observed in a cohort of salmon between fry and smolt stages were due to size-selective mortality, such that fry with small fork lengths underwent higher mortality than larger individuals. However, a subsequent study used a simulation to show that such… Expand

Figures and Tables from this paper

Otolith and fish size relationships, measurement error, and size-selective mortality during the early life of Atlantic salmon (Salmo salar)
TLDR
Comparison of back-calculated otolith size and standard length using least squares regression analyses revealed a weak relationship between these variables at each of the 5-day sampling intervals, but when data sets were pooled among intervals, variation in Otolith size accounted for 98% of the variation in alevin length. Expand
Annual variation in size-selective mortality of Atlantic salmon ( Salmo salar ) fry 1
We investigated the size-selective mortality of Atlantic salmon ( Salmo salar ) fry during two consecutive summers that differed markedly in weather conditions. We sampled fry shortly after emergenceExpand
Assessment of winter size‐selective mortality of young‐of‐the‐year Atlantic salmon (Salmo salar) using otolith microstructure analysis*
TLDR
This case study allowed not only a better comprehension of the population dynamics of those rivers but demonstrated the usefulness of otolith analysis to detect winter size-selective mortality under a natural environment. Expand
Annual variation in size-selective mortality of Atlantic salmon (Salmo salar) fry
TLDR
Interannual variability in size-selective mortality contributed to significant differences in the mean size of fry at the end of their first summer of life. Expand
Exploration of the relationship between somatic and otolith growth, and development of a proportionality-based back-calculation approach based on traditional growth equations
TLDR
It was proposed that, throughout the life of an individual from a selected population of A. butcheri, the sizes of its otolith remain in constant proportion to the average sizes of the otoliths of fish of the same ages. Expand
The back-calculation of size and growth from otoliths: Validation and comparison of models at an individual level
TLDR
The results suggest the use of the Modified-Fry model as a conservative approach in routine back-calculations of fish size at age from otoliths, despite the presence of age, growth and time-varying growth effects in the dataset. Expand
Growth and mortality of introduced fish larvae in a newly restored urban river
The potential of a newly restored river as a nursery for endangered rheophilic fish species was estimated by introducing a population of individually marked larvae of nase Chondrostoma nasus into twoExpand
Interactions compétitives entre le saumon atlantique et la truite arc-en-ciel : aspects écologiques, sélectifs et adaptatifs
TLDR
Results suggest that rainbow trout may potentially modify natural sélective pressure and that the relationships between heterozygosity and fitness in juvéniles Atlantic salmon were not affected by compétitive interactions between species. Expand
Comparative performance of juvenile sea trout families in high and low feeding environments
Groups of eight full-sibling wild sea trout Salmo trutta L. families, communally reared, exhibited highly significant differences in family representation in the largest 25 percentile within eachExpand
Application of otolith increment analysis to the study of maturation timing in female kokanee salmon
TLDR
This paper is intended to provide a history of the field and some of the techniques used, as well as some examples of individual cases, that have been used in the field. Expand
...
1
2
...

References

SHOWING 1-10 OF 19 REFERENCES
Selection for Growth Potential among Migratory Brown Trout (Salmo trutta) Fry Competing for Territories: Evidence from Otoliths
TLDR
There was a clear-cut selection for individuals with significantly larger otoliths at emergence among fry which established territories in artificial stream sections, and this selection pattern commenced with the onset of territorial aggression between fry. Expand
Otolith and fish size relationships, measurement error, and size-selective mortality during the early life of Atlantic salmon (Salmo salar)
TLDR
Comparison of back-calculated otolith size and standard length using least squares regression analyses revealed a weak relationship between these variables at each of the 5-day sampling intervals, but when data sets were pooled among intervals, variation in Otolith size accounted for 98% of the variation in alevin length. Expand
Babine lake sockeye salmon (Oncorhynchus nerka) enhancement program: testing some major assumptions
TLDR
Comparisons of wild and channel-produced fry did not reveal any substantial difference in their distribution, growth, and survival in the lake; however, increases in the abundance of fry were followed by increased adult returns. Expand
Selection for fast growth during the larval life of Atlantic cod Gadus morhua on the Scotian shelf
TLDR
The results support the hypothesis that fast growth increases the surv~vorship of Atlantic cod dunng larval 11fe in the plankton and indicate that the intensity of slze-selective mortality may vary considerably from year to year. Expand
Evidence for Size-Selective Mortality of Juvenile Sockeye Salmon (Oncorhynchus nerka) in Babine Lake, British Columbia
TLDR
Otolith – body length relations and back-calculation procedures were used to test the hypothesis that mortality of juvenile sockeye salmon in Babine Lake, British Columbia, is higher than previously thought. Expand
Uncoupling of Somatic and Otolith Growth Rates in Arctic Char (Salvelinus alpinus) as an Effect of Differences in Temperature Response
TLDR
It was found that otolith growth rate expressed as daily increase in weighings in Arctic char fry fed maximum rations was found, with exponential relationships between otolith weight and fish wet weight showing exponential relationships. Expand
Year-class strength and growth rate in young Atlantic cod Gadus morhua
TLDR
Differences in growth rates and associated exposure to high larval mortality rates were sufficient to account for much of the 4-fold difference in adult abundance among the yearclasses. Expand
Profitable stream positions for salmonids: relating specific growth rate to net energy gain
TLDR
A model is developed to predict potential net energy gain for salmonids in streams from characteristics of water velocity and invertebrate drift, and coho salmon always achieved higher specific growth rates than either brook trout or brown trout in concurrent experiments, and maintained growth to lower resource thresholds. Expand
Relationships between social status, otolith size at first feeding and subsequent growth in Atlantic salmon (Salmo salar)
TLDR
Sibling Atlantic salmon fry show variation in early growth rates, despite being of a similar size initially and being in the same environment with excess food, which has a critical impact on their subsequent life-history strategies. Expand
Predation on Eggs and Larvae of Marine Fishes and the Recruitment Problem
TLDR
This chapter discusses the types of predators on fish eggs and larvae and assesses how ecological and behavioral interactions influence the vulnerability of individuals and populations, and reviews methods and problems of studying the impact of predation on egg and larval survival in the sea. Expand
...
1
2
...