Abstract
Abstract The spawning period of largemouth bass (Micropterus salmoides) was greatly extended by the manipulation of water temperature. Adult bass that had been removed from natural populations before spawning and maintained in creek water at ambient temperatures (9.5-19.5°C), spawned within 1.5 to 11 days after being stocked directly into ponds with higher ambient temperature (average 23°C). Spawning occurred in groups of fish stocked from 10 June to 6 September - a significant extension of the average spawning season for northern populations. Upward temperature shock to stocked fish averaged 7 Celsius degrees. Fecundity, percentage fertilization, and percentage hatch were unaffected by the holding and stocking procedures. Some male and female bass spawned more than once under the thermal regime employed. Despite their origin from lake populations, stocked bass readily spawned in small ponds, demonstrating both the importance of temperature increases in inducing spawning and the adaptability of individual...
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