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Assessing Indices of Growth for Field Studies of Juvenile Salmon: An Experiment and Synthesis
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2018
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Source: Marine and Coastal Fisheries, 10(2), 204-223
[PDF-1.00 MB]
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Journal Title:Marine and Coastal Fisheries
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Description:The hypothesis that size-selective mortality in the first marine year is a major regulator of recruitment in Pacific salmon Oncorhynchus spp. has led to interest in assessing the recent growth of field-caught fish. Understanding differences in relative growth across years, regions, habitats, and prey fields may provide insights into factors influencing survival. Plasma insulin-like growth factor 1 (IGF1), muscle RNA : DNA ratio (RD), and scale circulus spacing have all been used as indices of recent growth in juvenile salmonids. We concurrently assessed these growth rate indices in a laboratory study of postsmolt, young-of-the-year, ocean-type Chinook Salmon O. tshawytscha. We synthesized results with previous work to inform selection of appropriate growth rate indices for field studies on juvenile salmonids. Muscle samples suitable for RD analysis were obtained nonlethally and without subsequent growth impacts, even for very small juvenile salmon (75–99 mm FL).
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Source:Marine and Coastal Fisheries, 10(2), 204-223
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ISSN:1942-5120;1942-5120;
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Rights Information:CC BY
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Compliance:Library
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