The spermiogenesis and sperm morphology of the Far-eastern redfins Tribolodon hakonensis (Gunther, 1880), T. brandtii (Dybowskii, 1872), and T. sachalinensis (Okada, Ikeda, 1937) were studied using scanning and transmission electron microscopy. At the spermatid stage, ultrastructural analysis of male germ cells showed no obvious differences between these species. The spermatozoa are primitive acrosome-lacking cells, which are typically found in many representatives of Teleostei with external insemination. Unlike other cyprinids, the angle of inclination of centrioles relative to each other differs slightly in the species under study. The mitochondrial apparatus contains one to five (usually one to three) mitochondria in T. hakonensis, two in T. sachalinensis, and one mitochondrion in T. brandtii.
Russian Journal of Marine Biology – Springer Journals
Published: May 22, 2012
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