Sperm-cell ultrastructure of North American sturgeons. I. The Atlantic sturgeon (<i>Acipenser oxyrhynchus</i>)

DiLauro, Martin N.; Kaboord, Wayne S.; Walsh, Rosemary; Krise, William F.; Hendrix, Michael A.

doi:10.1139/z98-127

Cited by 23 publications

(37 citation statements)

References 26 publications

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“…Generally, the sperm head in fishes is relatively small (2-4 μm) in relation to the total size of sperm. The exceptions were observed at Atlantic eel sperm [5,31] and at sturgeons and paddlefish Polyodon spathula (Walbaum) with elongated sperm head up to 10 μm in length and over 2 μm in width, containing acrosome [5,31,32,33,34,35,36,37] or acrosome less [38].…”

Section: Headmentioning

confidence: 99%

Tale of Fish Sperm and Factors Affecting Sperm Motility: A Review

Islam¹,

Akhter²

2012

ALS

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Motility is an important function of the male gamete, which allows sperm to actively reach and penetrate the female gamete in organisms with internal and external fertilization. Sexual activity of some fish is generally seasonal and fertilization is external. Sperm, once differentiated in the gonad, remain there completely quiescent until they are released into the external medium, which is either freshwater or sea water. Various parameters such as ion concentrations (K + , Na + , Ca 2+ ), osmotic pressure, pH, and temperature affect motility. In the present paper, we review the roles of these factors on sperm motility in the teleosts. Studying the effects of these factors on teleost sperm can help establish good activation and/or immobilizing media for improving either artificial fertilization or cryopreservation.

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Section: Headmentioning

confidence: 99%

Tale of Fish Sperm and Factors Affecting Sperm Motility: A Review

Islam¹,

Akhter²

2012

ALS

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“…In the sturgeons the longest spermatozoal head is that of the white sturgeon (10.52 mm) (Cherr & Clark, 1984), while that of the Atlantic sturgeon is shorter (3.98 mm) (DiLauro et al, 1998). The total head length (the sum of acrosome length, nuclear length and midpiece length) of paddlefish spermatozoa is about 5.85 mm.…”

Section: Discussionmentioning

confidence: 96%

“…Centrally located nuclear fossae were found in sperm nuclei of white (Cherr & Clark, 1984), stellate (Ginsburg, 1977), Atlantic (Dilauro et al, 1998) and shortnose (Dilauro et al, 1999) sturgeons and garfish (Afzelius, 1978). Centrally located nuclear fossae were found in sperm nuclei of white (Cherr & Clark, 1984), stellate (Ginsburg, 1977), Atlantic (Dilauro et al, 1998) and shortnose (Dilauro et al, 1999) sturgeons and garfish (Afzelius, 1978).…”

Section: Discussionmentioning

confidence: 99%

“…Acipenser oxyrhynchus is the only sturgeon species that has two endonuclear channels (DiLauro et al, 1998). Acipenser oxyrhynchus is the only sturgeon species that has two endonuclear channels (DiLauro et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

“…Transmission electron microscopy investigations of Acipenseriformes sperm have been performed only in sturgeons, including Russian sturgeon (Acipenser gueldenstaedti) (Ginsburg, 1968), stellate sturgeon (Acipenser stellatus) (Ginsburg, 1977), white sturgeon (Acipenser transmontanus) (Cherr & Clark,1984, 1985, Atlantic sturgeon (Acipenser oxyrhynchus) (DiLauro et al, 1998), shortnose sturgeon (Acipenser brevirostrum) (DiLauro et al, 1999), lake sturgeon (Acipenser fulvescens) (DiLauro et al, 2000) and pallid sturgeon (Scaphirhynchus albus) (DiLauro et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

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Ultrastructural study of spermatozoa of the paddlefish, Polyodon spathula

Zarnescu

2005

Zygote

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Paddlefish, Polyodon spathula, spermatozoa were examined by transmission electron microscopy. Their structure has the same characteristic architectural features as sturgeon spermatozoa. Paddlefish spermatozoa are of the primitive type and consist of a rod-shaped head, a midpiece and a long flagellum. The head is about 5.15 mm in length and contains the nucleus and an apical acrosomal complex. Inside the nucleus there are three nuclear channels that begin in the subacrosomal area and have a triple helical arrangement. An nuclear fossa is present centrally, at the posterior end of the nucleus. The midpiece contains a pair of centrioles in a perpendicular arrangement, mitochondria and a narrow cytoplasmic sleeve. The flagellum has a central axoneme with a 9 + 2 pattern and two lateral projections or fins.

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Ultrastructural investigations on spermatogenesis and spermatozoan morphology in the endangered Adriatic sturgeon, Acipenser naccarii (Chondrostei, Acipenseriformes)

Grandi

Astolfi

Chicca

et al. 2018

Journal of Morphology

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Spermatogenesis was investigated in the Adriatic sturgeon, Acipenser naccarii, by light and electron microscopy. The testis of the unrestricted type had a germinal compartment composed of lobules containing germ cells and Sertoli cells, and separated by a basal lamina from the interstitial compartment, in which Leydig and myoid cells were detected for the first time in Acipenseridae. Spermatogenesis occurred in spermatocysts produced when Sertoli cells became associated with type A spermatogonia of subsequent generations, which produced a clone of synchronized aligned spermatogonia. In primary spermatocytes at zygo-pachytene stage, the large spherical nucleus contained synaptonemal complexes. The smaller secondary spermatocytes were ovoid with a central round nucleus and scarce cytoplasm. Spermatids were interconnected by cytoplasmic bridges until early spermiogenesis. Chromatin initially condensed as long, twisted, and nonhomogeneous fibers and finally as a compact structure made of thick filaments.Early spermatids showed the flagellum, the primordia of centriole complex and of "implantation fossa," followed by the acrosomal vesicle formed by Golgi complexes and a fibrous body associated to centriole complex. The spermatozoan head had 10 postero-lateral projections and a trapezoidal nucleus, a cylindrical midpiece with six to eight mitochondria, the centriole complex, and a "9 + 2" flagellum with a pair of lateral fins. Three helical endonuclear canals crossed the nucleus from the acrosome base to the implantation fossa; their spiralization and that of chromatin fibers suggest a spiral twisting of the nucleus during spermiogenesis. The Sertoli cells performed phagocytosis of degenerating spermatids and spermatozoa. Significant interindividual differences were detected in most morphological parameters of spermatozoa. Data on spermatogenesis in A. naccarii and morphometric measurements on mature spermatozoa provide information about the reproductive biology of the species useful not only for phylogenetic studies but also for evaluation of sperm quality for artificial reproduction projects and restocking of this and other critically endangered sturgeon species. K E Y W O R D S Acipenseridae, Sertoli cells, spermatozoon, testis, transmission electron microscopy

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Sperm-cell ultrastructure of North American sturgeons. I. The Atlantic sturgeon (Acipenser oxyrhynchus)

Cited by 23 publications

References 26 publications

Tale of Fish Sperm and Factors Affecting Sperm Motility: A Review

Tale of Fish Sperm and Factors Affecting Sperm Motility: A Review

Ultrastructural study of spermatozoa of the paddlefish, Polyodon spathula

Ultrastructural investigations on spermatogenesis and spermatozoan morphology in the endangered Adriatic sturgeon, Acipenser naccarii (Chondrostei, Acipenseriformes)

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