Validation of the Scales for Age Determination in a Cyprinid, Scardinius erythrophthalmus (L., 1758)

Gürsoy, Çiğdem; Tarkan, Ali Serhan; Acipinar, Hasan; Gaygusuz, Özcan

doi:10.3923/ijzr.2005.33.36

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…Appearance false annuli in some observed scales could be linked to other extrinsic or intrinsic factors that can can lead to a variable growing rhythm, e.g. reproduction period (Hagerman, 1952;Gursoy et al, 2005), but this aspect should be further investigated.…”

Section: Figure 6 Microscope Images Of the Scales From The Lateral Side In S Racovitzai (15 X 40) Ascale With Circuli (C) Hyaline Intercimentioning

confidence: 99%

Structural and Morphometric Study of Scales in Petzea Rudd (Scardinius Racovitzai Müller 1958)

Șerban¹,

Grigoraş²

2018

Appl. Ecol. Env. Res.

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The present study reveals preliminary lepidological results in a critically endangered species, Petzea rudd (Scardinius racovitzai Müller 1958) from Petea Spring Natural Reservation, Bihor county, Romania. Study of scales morphology in Petzea rudd was performed by use of light microscopy. This is the first attempt to reveal some scale features such as: scale type, shape, arrangement and number of radii and position of focus on scale on Petzea rudd. The geometric morphometric analysis has been applied in order to identify the characteristics for a reliable discrimination between Petzea rudd and its related species from Romanian inland waters, common rudd, Scardinius erythropthalmus (Linnaeus, 1758). The comparative analysis of scales shape in S. racovitzai and S. erythrophthalmus highlighted the statistically significant discrimination among two sets of observations and the significant variation of focus position and shape of scales among these two species.

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Section: Figure 6 Microscope Images Of the Scales From The Lateral Side In S Racovitzai (15 X 40) Ascale With Circuli (C) Hyaline Intercimentioning

confidence: 99%

Structural and Morphometric Study of Scales in Petzea Rudd (Scardinius Racovitzai Müller 1958)

Șerban¹,

Grigoraş²

2018

Appl. Ecol. Env. Res.

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“…For example, the sex of juveniles cannot be determined using traditional methods (e.g., observation of the gonads), despite the importance of sex ratios to evaluate the status of exploited stocks. Similarly, difficulties have been faced when determining the age of individuals of some species, an essential parameter for growth estimates, population dynamic studies and for optimizing the harvesting time (Gursoy et al, 2005). Otoliths of some commercially important fish species such as European hake (Merluccius merluccius) or cod (Gadus morhua), for instance, have proved unreliable due to the presence of false rings, lack of definition of rings or deposition at irregular intervals (Morales-Nin et al, 1998;Hüssy et al, 2010;Ligas et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

The potential use of genomic methods in bottom trawl surveys to improve stock assessments in Europe

Rodríguez-Mendoza

Saborido-Rey

2023

Front. Mar. Sci.

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In Europe, research surveys carried out by state governments provide the great majority of fishery-independent data. Member States (MS) in the European Union (EU) regularly conduct research surveys to provide the necessary data to assess the status of exploited fish stocks and to monitor the general condition of the marine ecosystem. In the surveys, samplings are carried out throughout the distribution range of the targeted fish species using standardized gears (e.g., trawls and seines) and other methods (e.g., hydroacoustics and underwater cameras). In the context of fish stock assessment, survey data are important because they provide indices that help tuning the stock assessment models (e.g., the index of fish abundance) and key information about the size and age distributions of the stock, the size-age relationships, the proportion of fish mature at each age, and information on reproductive performance of the stocks. However, research surveys have a number of shortcomings that include, for example, a high economic cost coupled with complex logistics and a long time required for processing the collected data. In addition, some of the parameters that are needed in stock assessment cannot be estimated from survey data for certain commercially important species. For instance, age is usually determined using hard structures (such as otoliths) in fish target species. However, for European hake, age cannot be determined accurately because there are many difficulties in interpreting the ring patterns of the otoliths. This highlights the need to look for alternative methodologies such as genomics, that have the potential of improving the data obtained from research surveys and hence, improve fish stock assessments. Considering this, we carried out a review of the bottom trawl research surveys in the EU with the purpose of: 1) identifying the current approaches for monitoring fishery resources and the ecosystem and 2) determining how genomic techniques can be used to improve survey data, taking into account the needs of current and future stock assessment in Europe.

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Validation of the Scales for Age Determination in a Cyprinid, Scardinius erythrophthalmus (L., 1758)

Cited by 2 publications

References 13 publications

Structural and Morphometric Study of Scales in Petzea Rudd (Scardinius Racovitzai Müller 1958)

Structural and Morphometric Study of Scales in Petzea Rudd (Scardinius Racovitzai Müller 1958)

The potential use of genomic methods in bottom trawl surveys to improve stock assessments in Europe

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