Sperm-cell ultrastructure of North American sturgeons. II. The shortnose sturgeon (<i>Acipenser brevirostrum</i>, Lesueur, 1818)

DiLauro, Martin N.; Kaboord, Wayne S.; Walsh, Rosemary

doi:10.1139/z98-219

Cited by 25 publications

(51 citation statements)

References 18 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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“…Interspecific differences in the size and shape of sturgeon sperm cells depicted in previous works (DiLauro et al 1998(DiLauro et al , 1999(DiLauro et al , 2000, and in those of fishes in general (Jamieson 1991;Mattei 1991), compounded by the need to develop cryopreservation methods for this endangered species, led to this first known description of the sperm cell of this species. Here we describe the morphology and ultrastructure of the sperm cell of the pallid sturgeon, using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), respectively.…”

Section: Introductionmentioning

confidence: 80%

“…After primary fixation, cells were filtered through a 0.22-µm nucleopore filter, postfixed in 1% osmium tetroxide in 0.1 M sodium cacodylate buffer (pH 7.4), and then rinsed in buffer (DiLauro et al 1999). Filters containing cells were then dehydrated in a graded ethanol series, critical-point dried in bone-dry carbon dioxide, mounted, sputter-coated with gold-palladium, and stored under desiccation prior to SEM (DiLauro et al 2000).…”

Section: Tem and Semmentioning

confidence: 99%

“…Filters containing cells were then dehydrated in a graded ethanol series, critical-point dried in bone-dry carbon dioxide, mounted, sputter-coated with gold-palladium, and stored under desiccation prior to SEM (DiLauro et al 2000). Photomicrographs were archived in the IMIX system interfaced with a JSM 5400 scanning electron microscope (DiLauro et al 1998(DiLauro et al , 1999(DiLauro et al , 2000.…”

Section: Tem and Semmentioning

confidence: 99%

“…Sperm-cell morphology and ultrastructure are important in the development and evaluation of cryopreservation, and the underlying rationale for this was discussed in earlier works (DiLauro et al 1998(DiLauro et al , 1999. Interspecific differences in the size and shape of sturgeon sperm cells depicted in previous works (DiLauro et al 1998(DiLauro et al , 1999(DiLauro et al , 2000, and in those of fishes in general (Jamieson 1991;Mattei 1991), compounded by the need to develop cryopreservation methods for this endangered species, led to this first known description of the sperm cell of this species.…”

Section: Introductionmentioning

confidence: 99%

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Sperm-cell ultrastructure of North American sturgeons. IV. The pallid sturgeon (<i>Scaphirhynchus albus</i> Forbes and Richardson, 1905)

DiLauro¹,

Walsh²,

Peiffer³

et al. 2001

Can. J. Zool.

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Sperm-cell morphology and ultrastructure in the pallid sturgeon (Scaphirhynchus albus) were examined using transmission and scanning electron microscopy. Metrics and structure were compared with similar metrics obtained from other published descriptions of sturgeon sperm cells. General morphology was found to be similar to that of sperm cells of the white (Acipenser transmontanus), lake (A. fulvescens), stellate (A. stellatus), Chinese (A. sinensis), Russian (A. gueldenstaedti colchicus), and shortnose (A. brevirostrum) sturgeons, which all shared a gradual tapering of the nuclear diameter from posterior to anterior, unlike that of the Atlantic sturgeon (A. oxyrhynchus). The sperm cell of the pallid sturgeon was similar in size to that of the Atlantic sturgeon, being only slightly larger. The sperm cell of the pallid sturgeon differed from those of other sturgeons chiefly in the acrosomal region, where the posterolateral projections (PLP) have the shape of an acute triangle and are arranged in a spiral about the longitudinal axis of the cell. The PLP were longer than those of other sturgeons, being twice the length of those of the Atlantic sturgeon and 58% longer than those of the lake sturgeon. Also, in cross section the acrosome had the shape of a hollow cone rather than the cap of an oak tree acorn, as was found in ultrastructural studies of other sturgeons. In addition, we were able to confirm that the structural arrangement of the distal centriole of the midpiece is identical with that of the proximal centriole: nine sets of microtubular triplets around the periphery of the centriole. This information is of potential use to fishery biologists, forensic biologists, zoologists, reproductive physiologists, taxonomists, evolutionary biologists, and aquaculturists.

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Fins improve the swimming performance of fish sperm: A hydrodynamic analysis of the Siberian sturgeon Acipenser baerii

Gillies

Bondarenko²,

Cosson³

et al. 2012

Cytoskeleton

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The flagella of sturgeon sperm have an ultrastructure comprising paddle-like fins extending along most of their length. These fins are seen in several other marine and freshwater fish. The sperm of these fish are fast swimmers and are relatively short lived: it is therefore tempting to think of these fins as having evolved for hydrodynamic advantage, but the actual advantage they impart, at such a small length scale and slow speed, is unclear. The phrase "the fins improve hydrodynamic efficiency" is commonly found in biological literature, yet little hydrodynamic analysis has previously been used to support such conjectures. In this paper, we examine various hydrodynamic models of sturgeon sperm and investigate both swimming velocity and energy expenditure. All of the models indicate a modest hydrodynamic advantage of finned sperm, in both straight line swimming speed and a hydrodynamic efficiency measure. We find a hydrodynamic advantage for a flagellum with fins, over one without fins, of the order of 15-20% in straight line propulsive velocity and 10-15% in a hydrodynamic efficiency measure.

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Sperm-cell ultrastructure of North American sturgeons. II. The shortnose sturgeon (Acipenser brevirostrum, Lesueur, 1818)

Cited by 25 publications

References 18 publications

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

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

Sperm-cell ultrastructure of North American sturgeons. IV. The pallid sturgeon (<i>Scaphirhynchus albus</i> Forbes and Richardson, 1905)

Fins improve the swimming performance of fish sperm: A hydrodynamic analysis of the Siberian sturgeon Acipenser baerii

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