Artisanal fisheries in Karina and Akköy Coastal Lagoons

Kaykaç, M. Hakan; Tosunoğlu, Zafer

doi:10.12714/egejfas.2015.32.4.01

Cited by 2 publications

(1 citation statement)

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“…The fish specimens were collected by different sampling methods and fishing gears, such as backpack electrofishing (SAMUS 225G), cast net (10–16 mm mesh size), gill net (18–45 mm mesh size), and Söke‐type fyke net (Kaykaç, Tosunoğlu, & Tosunoğlu, 2015), which were considered the most convenient fishing gears for each site with different depths (30 cm–5 m) and widths (5–30 m). In order to standardize the sampling effort the electrofishing was performed three times – for about 15 min each time – in a segment of about 20 m in length (Hauer & Lamberti, 2007).…”

Section: Methodsmentioning

confidence: 99%

How does a reservoir affect the fish assemblage structure in a Mediterranean River (Turkey)?

Özdilek

Partal

Mestav

2022

River Research & Apps

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Most rivers around the Mediterranean region, regardless of size, are interrupted by human induced barriers. Although various studies have been conducted to investigate the impacts of reservoirs on undisrupted freshwater biota, what kind of effects they exert on the distribution of freshwater fish assemblages with respect to the presence of invasive species remains to be answered. To attend to this research need, the Karamenderes River, which is disrupted by the Bayramiç Reservoir, was selected as the research site. Relying on the river continuum concept (RCC), we hypothesized that fish assemblages in a given river would demonstrate a gradual downstream change unless the river is interrupted by any reservoir. The ad hoc unweighted pair group method with arithmetic means (UPGMA) agglomerative hierarchical cluster analyses revealed 11 fish assemblages 100 km down the studied river, which is characterized by four environmental gradients. Besides, co-occurrence network analyses were performed to gain a better understanding of the constructs of the observed fish assemblages. The analyses yielded two distinct clusters along the river and showed that the Bayramiç Reservoir had no decisive part in the spatial clustering of these fish assemblages. The migratory species Anguilla anguilla was found only in and around the river mouth area. The co-occurrence network analyses indicated that the freshwater, estuarine and introduced species were observable in distinct groups. It is notable that the non-native Cyprinus carpio and invasive Carassius gibelio were determined in the native freshwater fish species module. The research evidenced that the reservoir had a triple effect, that is, a migration barrier to migratory fish species, a donor facilitating invasion, and a cause of homogenization of river fish assemblages along the river. The results suggest that the impact of the reservoir should be assessed in view of multiple nested model and fish passageways and controlling invasive species are two contradictory problems as far as the impacts of reservoirs are concerned. Therefore, river management should be performed in a way to allow the native migratory species to migrate freely while preventing the introduced species from moving upstream or downstream to preserve and promote rivers' heterogeneity.

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Section: Methodsmentioning

confidence: 99%

How does a reservoir affect the fish assemblage structure in a Mediterranean River (Turkey)?

Özdilek

Partal

Mestav

2022

River Research & Apps

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Diversity of used fishing gears in the Aegean lagoons

Sağlam¹,

Akyol²

2022

EgeJFAS

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In this study, we determined the technical characteristics and target species of some fishing gears, used in lagoon fisheries along the Aegean Sea. The samplings were carried out in five lagoons (Enez, Homa, Karina, Akköy and Güllük) between 2014 and 2016. Technical plans of the fishing gears were drawn by MS-Visio programme with scale for gillnets, but no scales for longlines. A total of 10 type set nets of which 8 trammel nets and 2 gillnets, and 3 type longlines were determined. Target species comprise 8 families and 15 species for all fishing gear examined in the lagoon. Dicentrarchus labrax, Chelon auratus, Chelon labrosus, Chelon ramada, Chelon saliens, Mugil cephalus and Sparus aurata were commonly seen in the studied lagoons. Callinectes sapidus and Platichthys flesus were determined only in the Enez lagoon and Cyprinus carpio was determined only in the Güllük lagoon.

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Artisanal fisheries in Karina and Akköy Coastal Lagoons

Cited by 2 publications

References 0 publications

How does a reservoir affect the fish assemblage structure in a Mediterranean River (Turkey)?

How does a reservoir affect the fish assemblage structure in a Mediterranean River (Turkey)?

Diversity of used fishing gears in the Aegean lagoons

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