Quantitative Assessment of Scale Resorption in Migrating and Spawning Steelhead of the Snake River Basin

Autor:	Kristin K. Wright, Timothy Copeland, Kala Hernandez
Rok vydání:	2014
Předmět:	geography geography.geographical_feature_category Ecology Secondary sex characteristic Drainage basin Aquatic Science Biology Spawn (biology) Resorption Fishery Quantitative assessment Rainbow trout Life history Ecology Evolution Behavior and Systematics Semelparity and iteroparity
Zdroj:	Transactions of the American Fisheries Society. 143:1562-1568
ISSN:	1548-8659 0002-8487
DOI:	10.1080/00028487.2014.954054
Popis:	Scales have been used for decades as a tool to interpret life histories in steelhead Oncorhynchus mykiss. Resorption can affect the accuracy of life history interpretations based on scale patterns, depending on the amount of material resorbed. For example, resorption can affect the distinctiveness and characteristics of spawn checks. Spawn checks have been reported in iteroparous salmonids, but no published experimental studies have established the precise relationship between reproduction and scale features. Our objectives were (1) to quantify scale resorption, and (2) to identify contributing factors to the observed resorption in migrating and spawning Snake River steelhead. Prespawn and postspawn scale samples from 72 fish were paired for analysis. We found considerable individual variability in the amount of material resorbed between prespawn and postspawn samples (mean, 26%; SD, 13.7%). Most resorption occurred during the winter as gonads matured and secondary sex characteristics were formed....
Databáze:	OpenAIRE
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