Percorrer por autor "Pubert, Eve-Marine"
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- Parasite diversity in plaice (Pleuronectes platessa): potential tool for stock identification in Icelandic waters?Publication . Pubert, Eve-Marine; Randhawa, Haseeb S.Understanding the stock structure of a commercial species is essential for sustainable 36 management. Failure to do so can lead to the depletion of regional sub-populations, erosion 37 of genetic diversity, and ecosystem services loss. Plaice, Pleuronectes platessa, is a 38 commercially exploited species inhabiting the continental shelf around Iceland. Despite a 39 tagging study providing support for strong spawning site and feeding ground fidelity, and 40 otolith microstructure analysis revealing local population structure, plaice is managed as a 41 single stock in Icelandic waters. Here, we describe and quantify the parasite fauna of plaice, 42 and assess the potential of parasites as biological tags for stock identification of plaice in 43 Icelandic waters. A total of 82 plaice were sampled from different geographical locations 44 (North and South) and seasons (summer and winter) in Iceland. Our sampling identified 11 45 parasites, five of which are new parasite records for plaice in Icelandic waters: the trematodes 46 Zoogonoides viviparus (adults) and Rhipidocotyle sp. (metacercariae), and the nematodes 47 Contracaecum osculatum (larvae), Dichelyne sp. (adults), and Hysterothylacium aduncum 48 (larvae and adults). Additionally, we recovered metacercariae of the trematode genus 49 Apatemon, which has not been recorded previously from plaice. Two parasites were 50 identified as potential biological tags for stock identification, namely the nematode A. simplex 51 and the trematode Z. viviparus. Our findings support a complex stock structure for plaice in 52 Icelandic waters and the need for an integrative strategy to stock identification to provide fine 53 spatial scale data required to inform fisheries managers.
- Study of parasite diversity and otolith shape of plaice (Pleuronectes platessa) off the coast of Iceland for stock discriminationPublication . Pubert, Eve-Marine; Randhawa, Haseeb; Erzini, KarimUnderstanding the stock structure of a commercial species is essential for sustainable management. Failure to do so can lead to the depletion of regional sub-populations, genetic diversity erosion, and ecosystem services loss. Plaice, Pleuronectes platessa, are a commercially important species for the Icelandic economy and are found in warm southern and cold northern waters. However, plaice is managed as a single stock. Over the last three decades, the use of parasites as biological markers has proved effective in distinguishing between different fish stocks. The use of otolith shapes for stock discrimination has gained popularity in recent years thanks to advances in image analysis tools and geometric methods. The study on 82 individuals of plaice from different geographical locations and seasons in Iceland showed that the community of parasites and the morphology of otoliths varied significantly between regions and periods, constituting several sub-populations in Icelandic waters. A notable differentiation between Icelandic plaice stocks was observed according to otolith shape and parasitic diversity. Otolith shape showed significant differences between the four geographical and seasonal groups (North-Summer, North-Winter, South-Summer, and South-Winter). Plaices collected in the southern region during the winter had otoliths with distinct shapes compared with the other groups. The parasite study confirmed the otolith shape results. The South-Winter group was also distinguished by a higher abundance of parasites and a different parasite composition than the other groups. Hysterothylacium aduncum was a candidate to be a parasite tag due to its constant presence throughout the year and in all regions but with notable variations in abundance and prevalence.