First observations of intersex development in paddlefish <scp><i>Polyodon spathula</i></scp>

Schooley, Jason D.; Geik, Adam; Scarnecchia, Dennis L.

doi:10.1111/jfb.14442

Cited by 3 publications

(3 citation statements)

References 50 publications

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“…Both the Neosho and Spring rivers have been impacted by heavy metal contamination as a result of the extensive zinc–lead mining undertaken on lands draining both watersheds in the late 19th and early 20th centuries (Gibson, 1972; Manders & Aber, 2014; Weidman, 1932). As of 2020, concerns persist over the effects of heavy metal contamination on the aquatic and terrestrial life of the area (Angelo et al, 2007; Beattie et al, 2017; EPA, 2019; Kiner et al, 2005), including paddlefish reproductive development (Schooley et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Recruitment contributions and natal fidelity in tributary rivers of the Grand Lake, Oklahoma, Paddlefish stock

Schooley¹,

Whitledge

Scarnecchia

2021

Fisheries Management Eco

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Microchemistry of sectioned dentary (lower jaw) bones was used to determine natal river (Neosho, Spring or Elk River) of paddlefish Polyodon spathula (Walbaum) in the economically important snag fishery in Grand Lake, northeastern Oklahoma, and to assess the relative importance of the tributary rivers as sources of recruits to the fishery. Geological differences between the Neosho River and Spring River watersheds resulted in large differences in water strontium:calcium (Sr:Ca) ratios reflected in dentary Sr:Ca for paddlefish from each river. Dentary core Sr:Ca signatures were used to infer natal river for paddlefish harvested over the period 2008–2018. Most harvested fish (87%) were identified as Neosho River origin, and 7% were within the predicted range for Spring River origin (6% undetermined). Relative frequencies of Neosho River and Spring River‐origin fish (the latter, all ≤10%) differed among cohorts but did not differ among years, locations or sexes. Results corroborate a sonar survey of spawning substrates that concluded that the Neosho River has higher potential value for paddlefish spawning and recruitment than the Spring River. No evidence of natal river fidelity was found. Results highlight the importance of maintaining habitat conditions and inform harvest management regulations required for paddlefish spawning, recruitment and sustainability.

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Section: Introductionmentioning

confidence: 99%

Recruitment contributions and natal fidelity in tributary rivers of the Grand Lake, Oklahoma, Paddlefish stock

Schooley¹,

Whitledge

Scarnecchia

2021

Fisheries Management Eco

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“…It is also possible that these individuals were intersex. Intersex individuals occur in wild and cultured sturgeon popula-tions [16][17][18] and, occasionally, in paddlefish [19]. Intersex individuals have been described in situations of exposure to exogenous sex hormones [17,20,21]; however, it is unclear if these compounds exist in sufficiently high concentrations in the systems that we sampled to cause sex reversal.…”

Section: Resultsmentioning

confidence: 99%

Real-Time PCR-Based Method for Sex Determination in Lake Sturgeon (Acipenser fulvescens)

2022

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The characterization of demographic features in natural populations is important to understand recruitment dynamics, mating systems, and propensities for loss of genetic diversity. The accurate identification of sex can be difficult in sexually monomorphic species. We present a melt curve analysis based on qPCR assays for lake sturgeon (Acipenser fulvescens) sex identification and validation using the AllWSex2 marker and adult males and females (total N = 143) with an assigned field sex from two populations (Black Lake, MI, and Menominee River, MI–WI border, USA). The assay is highly accurate (~98% concordance between putative or confirmed field and molecular sex classification), fast, and easy to use. The detected inconsistencies between field and molecular sexing were partially attributed to field-sexing uncertainty. This method will allow researchers to rapidly determine the sex of individuals of this regionally threatened species to use in conservation efforts and research.

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“…They reach sexual maturity at the age of 7-8 years in males and 10-13 years in females [18,19]. The eggs are small, with a diameter of 2.5-3 mm, and females lay about 100,000 eggs per reproduction season [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Qualitative and Nutritional Evaluation of Paddlefish (Polyodon spathula) Meat Production

et al. 2022

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Polyodon spathula is a valuable species of sturgeon native to North America that has acclimatized very well in Europe. Detailed knowledge of the quantitative and qualitative productive performance of paddlefish meat is of interest. Through this article, we aimed to highlight the chemical composition, cholesterol, and collagen content of fillets issued from paddlefish aged two and three summers and to highlight, as well as the nutritional value, the profile of fatty acids and amino acids, the sanogenic indices and the biological value of proteins for the epaxial and hypaxial muscle groups. The chemical analysis of the fillets by age indicated slightly higher values in summer three, compared to summer two: +5.32% dry matter, +0.89% protein, +41.21% fat, therefore +10.94% gross energy and for collagen by 2.94%; instead, for water, minerals and the W/P ratio the values were lower by 1.52%, 10.08%, and 2.29%. The nutritional assessment revealed that paddlefish has a meat with high PUFA content (approx. 22% of total fatty acids) and good values of sanogenic indices (Polyunsaturation Index = 7.01–8.77; Atherogenic Index = 0.57; Thrombogenic Index = 0.38–0.39; Hypocholesterolemic Fatty Acids = 33.01–41.34; Hypocholesteromic/Hypercolesteromic Fatty Acids ratio = 1.9). Also, the proteins of these fish are of good quality for young and adult consumers (EAA index = 156.11; Biological Value = 158.46; Nutritional Index (%) = 28.30) and good enough for children (Essential Amino Acids Index = 96.41; Biological Value = 93.39; Nutritional Index (%) = 17.45).

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First observations of intersex development in paddlefish Polyodon spathula

Cited by 3 publications

References 50 publications

Recruitment contributions and natal fidelity in tributary rivers of the Grand Lake, Oklahoma, Paddlefish stock

Recruitment contributions and natal fidelity in tributary rivers of the Grand Lake, Oklahoma, Paddlefish stock

Real-Time PCR-Based Method for Sex Determination in Lake Sturgeon (Acipenser fulvescens)

Qualitative and Nutritional Evaluation of Paddlefish (Polyodon spathula) Meat Production

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