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  1. Article ; Online: Polygynandry and high genetic diversity supported by kinship and population genetics from neotropical catfish ichthyoplankton

    Frantine‐Silva, Wilson / Savada, Camila Satie / de Almeida, Fernanda Simões / Orsi, Mário Luís

    Ecology of Freshwater Fish. 2023 Apr., v. 32, no. 2 p.406-415

    2023  

    Abstract: Knowledge about reproductive biology is critical for understanding species ecology and evolution, hence their conservation. However, such information remains elusive for many species due to the difficulty of observing mating in nature. Herein, we coupled ...

    Abstract Knowledge about reproductive biology is critical for understanding species ecology and evolution, hence their conservation. However, such information remains elusive for many species due to the difficulty of observing mating in nature. Herein, we coupled population and sociogenetic analysis to assess the reproductive biology of an important South American catfish, the “painted catfish” Pimelodus maculatus. We analysed the genetic diversity and kinship patterns of three wild ichthyoplankton samples identified by DNA barcoding and screened with microsatellite loci. We found the same trend in the three samples analysed: a high number unrelated larvae (r < 0.25) and potential parents involved (Ca1, 24♀:24♂; Ca2, 21♀:23♂; Cin, 24♀:25♂), as well as a high number of familial clusters (ML: 19‐21; MCMC: 23‐26). The data indicate a parental sexual proportion close to 1:1 and a polygynandrous mating system. We found high levels of genetic diversity, low GST values (GST < 0.014), but moderate DEST values between the tributary and reservoir samples (DEST > 0.25; Cin x Ca1 or Cin x Ca2), a similar pattern to the observed in adult populations. These results indicate that the mating system of P. maculatus has played an important role in minimising the loss of genetic diversity, a condition that may have favoured the species in a highly fragmented landscape.
    Keywords DNA barcoding ; Neotropics ; Pimelodus ; adults ; catfish ; evolution ; freshwater fish ; genetic variation ; habitat fragmentation ; ichthyoplankton ; kinship ; microsatellite repeats ; population genetics
    Language English
    Dates of publication 2023-04
    Size p. 406-415.
    Publishing place John Wiley & Sons, Ltd
    Document type Article ; Online
    Note JOURNAL ARTICLE
    ZDB-ID 913011-1
    ISSN 0906-6691
    ISSN 0906-6691
    DOI 10.1111/eff.12695
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

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  2. Article: Hatchery fish stocking: case study, current Brazilian state, and suggestions for improvement

    Casimiro, Armando Cesar Rodrigues / Vizintim Marques, Ana Carolina / Claro-Garcia, Alexander / Garcia, Diego Azevedo Zoccal / de Almeida, Fernanda Simões / Orsi, Mário Luís

    Aquaculture international. 2022 Oct., v. 30, no. 5

    2022  

    Abstract: Hatchery fish stocking is one of the main actions adopted as a form of conservation and replacement of fishing stocks. Under Brazilian law, the release of fish has become mandatory and is seen as one of the main ways of mitigating the negative effects on ...

    Abstract Hatchery fish stocking is one of the main actions adopted as a form of conservation and replacement of fishing stocks. Under Brazilian law, the release of fish has become mandatory and is seen as one of the main ways of mitigating the negative effects on fish populations and preserving the ichthyofauna. Since its institution, the efficiency of this method has been questioned by the Brazilian scientific community, due to the lack of monitoring based on scientific criteria. The objective of this work was to discuss the few available reports and to analyze their deficiencies and analyze the real risks and/or benefits arising from the methodologies employed in hatchery stocking activities developed in Brazil. For this, three different studies developed in the Paranapanema River, Southeast/South of Brazil, were evaluated seeking evidence of the efficiency or inefficiency of these actions, such as management of the conservation of fish species and stocks. Our analysis shows that this management policy is poorly evaluated, and review of the planning of the stocking programs is essential, in order to improve, update, modernize, and unify the knowledge of the producing stations with respect to the existing ecological and genetic studies, aiming at better monitoring and greater effectiveness in the results advance. Also, a protocol is suggested to standardize and guide new conservationist policies of hatchery fish stocking.
    Keywords aquaculture ; case studies ; fish ; hatcheries ; issues and policy ; protocols ; rivers ; Brazil
    Language English
    Dates of publication 2022-10
    Size p. 2213-2230.
    Publishing place Springer International Publishing
    Document type Article
    ZDB-ID 1176356-5
    ISSN 1573-143X ; 0967-6120
    ISSN (online) 1573-143X
    ISSN 0967-6120
    DOI 10.1007/s10499-022-00898-4
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 5774: Show issues

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    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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