Abstract
AbstractThis study determined the number of eggs produced daily by golden shiners Notemigonus crysoleucas during a 111‐d spawning season and the relationship of egg production to water temperature. On March 15, 2000, four 5.9‐m2, plastic‐lined pools were each stocked with fifty 1‐year‐old golden shiners. Mean (±SD) individual weight of fish at stocking was 9.2 ± 3.7 g. During March 16 through July 4, the spawning substrate in each pool was collected daily and replaced with clean substrate. Eggs were removed from mats in a 1.5% sodium sulfite bath, and the total volume of eggs from each pool was recorded. The mean number of eggs per unit volume (based on twenty‐seven 2‐mL samples) was 704 ± 109 eggs/mL. Approximately 2.75 million eggs were produced by no more than 200 brooders (∼2.4‐kg total mass) over 111 d. Egg production was greatest during the month of May (average = 14,339 eggs·kg−1·d−1). The number of eggs collected daily showed a significant positive correlation with water temperature (P < 0.05) up to 22°C and then declined with further increases in water temperature.
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