Seasonal changes in shark testicular structure and spermatogenesis
作者： Glenn R. Parsons , Harry J. Grier
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摘要: In this report, seasonal changes in testicular structure and spermatogenesis several shark species are reviewed, new information concerning the bonnethead shark, Sphyrna tiburo, is presented. Shark separated into four categories based on relationship between GSI mating season: 1) that have a defined cycle season, 2) mate year-round, 3) show no change but 4) year-round. The testis of S. tiburo differs from few been examined not all spermatogenic stages present at times year, an annual zone degeneration progresses through present, there appears to be complete regression recrudescence.
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