Field endoscopy for identifying gender, reproductive stage and gonadal anomalies in free-ranging sturgeon (<i>Scaphirhynchus</i>) from the lower Mississippi River

Divers, Stephen J.; Boone, S. Shaun; Hoover, Jan Jeffrey; Boysen, K. A.; Killgore, K. J.; Murphy, Catherine E.; George, Steven G.; Camus, Alvin C.

doi:10.1111/j.1439-0426.2009.01337.x

Cited by 47 publications

(31 citation statements)

References 24 publications

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“…All pallid sturgeon collected over 750-mm without tags or marks to indicate that they were hatchery-reared were transferred to Gavins Point National Fish Hatchery (Yankton, SD) (Bryan et al, 2007;Diver et al, 2009). Fish were categorized as either reproductive, meaning they were sexually mature and ready to spawn the year collected (stage IV as described in Moos, 1978), or non-reproductive, i.e.…”

Section: Methodsmentioning

confidence: 99%

Population characteristics of pallid sturgeon (Scaphirhynchus albus (Forbes & Richardson, )) in the Lower Missouri River

2013

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Summary Population characteristics of pallid sturgeon Scaphirhynchus albus in the lower Missouri River are relatively unknown. Therefore, data collected from the Nebraska Game and Parks Commission Pallid Sturgeon Population Assessment Program was synthesized to (i) document the population structure of pallid sturgeon by origin (hatchery‐reared or wild), gender, and reproductive readiness, (ii) document the minimum size and age‐at‐maturity by gender, and (iii) document the fecundity rates of the fish that were successfully spawned in the hatchery. During this 4‐year study (2008–2011), relative abundance for wild and hatchery‐reared pallid sturgeon collected with gill nets did not significantly change whereas relative abundance for wild fish using trot lines declined significantly. The proportion of hatchery‐reared pallid sturgeon increased annually, with the population being composed primarily of hatchery‐reared fish. The proportion of reproductively ready females to non‐reproductively ready females was 1 : 2.0, compared to male ratios at 1 : 0.9. Minimum fork length‐at‐maturity was estimated for females at 788 mm and for males at 798 mm. Minimum age‐at‐maturity for hatchery‐reared released fish was age‐9 for females and age‐7 for males. Highest relative fecundity, based on the ovosomatic index, was 10% with an overall mean of 7%. The number of eggs per ml (egg size) was not correlated with fork length (P = 0.0615) or weight (P = 0.0957). Relative condition factor (Kn) for females was significantly different by reproductive condition (P = 0.0014) and Kn for males did not differ between reproductive conditions (P = 0.2634). Detecting shifts in population characteristics are essential not only to understand population dynamics since hatchery inputs and natural perturbations continue to change the population structure but also to assess species recovery efforts to ensure long‐term species sustainability.

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Section: Methodsmentioning

confidence: 99%

Population characteristics of pallid sturgeon (Scaphirhynchus albus (Forbes & Richardson, )) in the Lower Missouri River

2013

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“…Rectifying this shortcoming should be a focus for further development in veterinary fish surgery literature (e.g. Divers et al 2009;Hanley et al 2010). Conversely, the wide variety of surgical cases encountered by aquatic veterinarians provides useful experience when less routine, more complicated surgical procedures are considered, such as coupling electronic tag implantation with attachment of sensors in sensitive locations.…”

Section: Veterinary Limitationsmentioning

confidence: 98%

“…Not only can veterinarians with particular expertise be tapped, but expensive specialized equipment can be accessed that might be difficult to purchase for a single project (Hernandez- Divers et al 2004;Divers et al 2009). …”

Section: Additional Utility Of Veterinarians In Electronic Tag Implanmentioning

confidence: 99%

The veterinarian’s role in surgical implantation of electronic tags in fish

Harms

Lewbart

2010

Rev Fish Biol Fisheries

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The current role of veterinarians participating in the intracoelomic surgical implantation of electronic tags in fisheries research projects with researchers is limited, but could be expanded. Veterinary training is broadly applicable to conducting surgeries on any species, and there are increasing numbers of veterinarians with fish-specific experience. A few of the roles veterinarians can play include advising on surgical instrument selection and acquisition, interfacing with Institutional Animal Care and Use Committees, devising strategies for anesthesia, providing direction on disinfection and sterilization, complying with regulatory requirements, providing individualized surgery instruction, and occasionally performing field surgeries. Veterinarians and fish researchers bring different strengths and deficits to bear in a fish surgery project, and it is helpful to recognize these for successful collaborations. Engaging veterinary consultation for electronic tag implantation surgeries in fish can be a mutually beneficial experience for the researcher and the veterinarian, with dividends in data quality and welfare of the research subjects.

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“…If transmitters are attached externally, ultrasonography or endoscopy may be used to determine sex and maturity [96]–[102]. The primary limitation of these techniques is that it is often difficult to differentiate immature females from males; in addition, the stage of maturity in males cannot be determined as size of testicular lobe does not always confer stage of maturity.…”

Section: Research Techniquesmentioning

confidence: 99%

Research Tools to Investigate Movements, Migrations, and Life History of Sturgeons (Acipenseridae), with an Emphasis on Marine-Oriented Populations

Nelson¹,

Doukakis

Lindley

et al. 2013

PLoS ONE

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Worldwide, sturgeons (Acipenseridae) are among the most endangered fishes due to habitat degradation, overfishing, and inherent life history characteristics (long life span, late maturation, and infrequent spawning). As most sturgeons are anadromous, a considerable portion of their life history occurs in estuarine and marine environments where they may encounter unique threats (e.g., interception in non-target fisheries). Of the 16 marine-oriented species, 12 are designated as Critically Endangered by the IUCN, and these include species commercially harvested. We review important research tools and techniques (tagging, electronic tagging, genetics, microchemistry, observatory) and discuss the comparative utility of these techniques to investigate movements, migrations, and life-history characteristics of sturgeons. Examples are provided regarding what the applications have revealed regarding movement and migration and how this information can be used for conservation and management. Through studies that include Gulf (Acipenser oxyrinchus desotoi) and Green Sturgeon (A. medirostris), we illustrate what is known about well-studied species and then explore lesser-studied species. A more complete picture of migration is available for North American sturgeon species, while European and Asian species, which are among the most endangered sturgeons, are less understood. We put forth recommendations that encourage the support of stewardship initiatives to build awareness and provide key information for population assessment and monitoring.

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Field endoscopy for identifying gender, reproductive stage and gonadal anomalies in free-ranging sturgeon (Scaphirhynchus) from the lower Mississippi River

Cited by 47 publications

References 24 publications

Population characteristics of pallid sturgeon (Scaphirhynchus albus (Forbes & Richardson, )) in the Lower Missouri River

Population characteristics of pallid sturgeon (Scaphirhynchus albus (Forbes & Richardson, )) in the Lower Missouri River

The veterinarian’s role in surgical implantation of electronic tags in fish

Research Tools to Investigate Movements, Migrations, and Life History of Sturgeons (Acipenseridae), with an Emphasis on Marine-Oriented Populations

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