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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
Sponsored by:Sichuan Society of Zoologists; Chengdu Giant Panda Breeding Research Foundation; Sichuan Association of Wildlife Conservation; Sichuan University
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Studies on the Sperm Micro-ultrastructure of Largemouth Bass, Micropterus salmoides
Author of the article:张晓光,沈方方,刘淑琰,贾 武
Author's Workplace:河南师范大学
Key Words:Micropterus salmoides;sperm;ultrastruccture
Abstract:The current study investigated sperm ultrastructure of largemouth bass, Micropterus salmoides using scanning electron microscope (SEM) and transmission electron microscope(TEM). The sperm of largemouth bass has three major parts: a nearly spherical head without an acrosome, a no obvious midpiece, and a slender flagellum. The full-length of sperm is 25.07±4.93μm(n=30)with a spherical head length of 1.73±0.29μm in diameter (n=30)and a slender flagellum length of 23.00±4.86μm long(n=30). The head of sperm is mainly composed of a mushroom shaped nuclei, and the clustering electron-dense is separated by an electronlucent area. The nucleus near the flagellum segment is a depression, and it forms shallow nuclear fossa. The midpiece of sperm contains the centriolar complex and the sleeve. The centriolar complex is composed of the proximal and distal centriole. The proximal centriole is located inside the nuclear fossa, and it is parallel to the cross axis of nuclei. The "T" shaped distal centriole located outside the nuclear fossa and inside the sleeve is the base of flagellum, and it is perpendicular to the proximal centriole. There are about 17±4 unequally sized mitochondrion inside the central space of both sides of sleeve. The flagellum of sperm stretched out of the central space of sleeve is mainly composed of the axoneme and the lateral fin. The axoneme comprised microtubule configurations in a ‘9 + 2’ microtubule pattern. The lateral fins are distributed on both sides of flagella. Results revealed that the sperm of M. salmoides is categorized as Type I, which is clear distinction from sperm of other Perciformes in the shape of sleeve, the number and shape of mitochondria. The sleeve structure of M. salmoides is accord with the typical sleeve structure of teleost fishes sperm, but the shape and the number of mitochondria of M. salmoides are similar with amphibian species, indicating that M. salmoides is more original in phylogenetic development than the other species of Perciformes.
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