Contribution to some biological aspects of invasive marbled spinefoot (<i>Siganus rivulatus</i>, Forsskål 1775) from the Turkish coast of southern Aegean Sea

Soykan, Ozan; Gülşahin, Anıl; Cerim, Hasan

doi:10.1017/s0025315420000351

Cited by 5 publications

(4 citation statements)

References 19 publications

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“…As in previous studies carried out in Rhodes (Corsini-Foka et al, 2010;Corsini-Foka, 2010), a positive allometric mode of growth for F. commersonii has been found in other invaded Mediterranean regions (Bariche & Kajajian, 2012;Castriota et al, 2014;Edelist, 2014;Elbaraasi, 2014;Vitale et al, 2016). The results for the two siganids may be compared with those reported in the literature (Taskavak & Bilecenoglu, 2001;Bariche, 2005;Shakman et al, 2008;Ceyhan et al, 2009;Erguden et al, 2009;Corsini-Foka et al, 2010;Başusta et al, 2013;Beğburs & Kebapçioğlu, 2013;Erguden et al, 2015;Soykan et al, 2020). Furthermore, positive allometric growth was observed for T. flavimaculosus from Iskenderun Bay, Turkey (Erguden et al, 2009;Erguden et al, 2015).…”

Section: Discussionsupporting

confidence: 66%

“…Remarkably, the south Aegean areas where siganids are abundant, are also invaded by a wide variety of alien macrophytes (Tsiamis, 2012;ELNAIS, 2020); this complicates the issue and could lead to changes in the original-native structure of the bio-communities. As already mentioned, siganids are commercially important in the area under study, as in other invaded regions of the eastern Mediterranean (Turkey, Cyprus, Lebanon, Egypt, Libya, Israel) (Cerim et al, 2020;Soykan et al, 2020), contrarily to Crete where both siganids appeared later than in Rhodes, at the beginning of the year 2000, and, although common now (Skarvelis et al, 2015), they are still discarded (Authors, pers. comm.).…”

Section: Discussionmentioning

confidence: 96%

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Small-scale fishery catch composition in Rhodes (Eastern Mediterranean Sea)

KONDYLATOS,

PERDIKARIS,

KAOUKIS

et al. 2023

Medit. Mar. Sci.

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Trammel net and boat-seine experimental fishing samplings were carried out seasonally, over a rocky-sandy and a Posidonia oceanica habitat respectively, in the coastal waters of Rhodes, south-eastern Aegean Sea, Greece, between 2019 and 2020. Fish catch composition, abundance and biomass were investigated as a contribution to the qualitative and quantitative monitoring of the fish assemblages in the artisanal fishery in this Greek marine region most affected by biological invasion. A total of 56 native and 11 alien fish species were captured. Five invasive species Fistularia commersonii, Pterois miles, Siganus rivulatus, Siganus luridus and Lagocephalus sceleratus were recorded using both fishing gear. In trammel nets, the alien to native fish species ratio was 1:2.87 with eight allochthonous species composing 43% of the total abundance and greatly exceeding native species biomass with the most dominant being F. commersonii, P. miles, S. rivulatus and S. luridus. Boat seine samples were dominated by Spicara smaris and Boops boops, which accounted for 84% and 56% of total abundance and biomass, respectively, while the alien to native fish species ratio was 1:5.1. The 10 Lessepsian fish, i.e., fish that have entered the Mediterranean Sea via the Suez Canal, identified on a Posidonia seabed represented a small proportion of the total abundance (3.4%), while their biomass reached 17% of the total catch, with a prevalence of F. commersonii. Among alien fish on P. oceanica, S. rivulatus exhibited the greatest abundance, followed by F. commersonii, Parupeneus forsskali and S. luridus, with small but not negligible densities of Pteragogus trispilus and Torquigener flavimaculosus. The abundance of Pterois miles over the rocky-sandy habitat was remarkable. Results indicate a transitional shift in fish catch composition with introduced species competing with natives for food and space (i.e. between introduced siganids and Sparisoma cretense, Sarpa salpa, between the recently introduced P. forsskali and mullids, and between introduced P. miles and scorpaenids), further influenced synergistically by environmental and anthropogenic factors. The Total-Standard length and Total weight-Total length relationships and their applications in fisheries data for the allochthonous fish are briefly discussed.

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Section: Discussionsupporting

confidence: 66%

Section: Discussionmentioning

confidence: 96%

Small-scale fishery catch composition in Rhodes (Eastern Mediterranean Sea)

KONDYLATOS,

PERDIKARIS,

KAOUKIS

et al. 2023

Medit. Mar. Sci.

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“…SF is a non-predatory herbivore that feeds on algae and seagrasses which make this species at a lower trophic level. Those characteristics explain the significantly low T-Hg concentration (Soykan et al, 2020). T-Hg concentration in fresh SM, an omnivorous species, ranged between 0.004 and 0.014 mg/kg.…”

Section: Fish Contamination Levelsmentioning

confidence: 95%

Health risk assessment of methyl mercury from fish consumption in a sample of adult Qatari residents

Al-Sulaiti¹,

Ramadan²,

Soubra³

2023

Environ Monit Assess

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Fish constitutes an essential source of high-quality protein and is, at the same time, the source of exposure to many hazardous contaminants, namely mercury and methyl mercury (MeHg). This study aims at assessing the risk that MeHg poses to the health of adult Qatari residents through fish consumption. Data on fish consumption were collected using a self-administered online survey composed of three sections that collected information about the fish-eating patterns of the participants. The fish species that were reported to be consumed by ≥ 3% of the respondents were sampled and analyzed for their total mercury (T-Hg) content levels. MeHg concentrations were derived from T-Hg content levels using a scenario-based approach. Disaggregated fish consumption and contamination data were combined using the deterministic approach to estimate MeHg intakes. The average, 75th, and 95th percentiles of the MeHg intake estimates were determined and compared to the tolerable weekly intake (TWI) set by the European Food Safety Agency (EFSA) (1.3 μg·kg−1·w−1). All fish samples contained T-Hg at levels ˂ 0.3–0.5 µg/g with a mean value of 0.077 µg/g. The study population had an average fish consumption of 736.0 g/week. The average estimated weekly intakes of MeHg exceeded TWI for some fish consumers including females of childbearing age and those following a high-protein diet. Our study highlights the need to establish regulatory guidelines and dietary advice based on risk/benefit ratio.

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“…The fish were captured from the depth range of 1-20 m. Data analysis. Growth coefficient (K), asymptotic, length (L inf ), theoretical age at a length of zero (t 0 ), length at maturity for sexes (L m ) (the total length at which 50% of individuals are mature), and the water temperature (T) were 0.162 year -1 , 27.7 cm, -0.10 year, 16.60 cm (female), 16.84 cm (male), and 19.0°C, respectively (Soykan et al 2020). A length-converted catch curve was used to estimate total mortality (Z) (Pauly 1983).…”

Section: Methodsmentioning

confidence: 99%

Mortality and exploitation of marbled spinefoot, Siganus rivulatus (Actinopterygii: Perciformes: Siganidae), from southern Aegean Sea small-scale fishery

Cerim¹,

Soykan²,

Gülşahin³

2020

Acta Ichthyol. Piscat.

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Background. In the small-scale fisheries of the Gulf of Gökova (Turkish coast of the southern Aegean Sea) the marbled spinefoot, Siganus rivulatus Forsskål et Niebuhr, 1775, is a commercially important species. No sustainability study, however, has been carried out on the stock assessment and management of this species in the gulf. The aim of the presently reported study was to determine the mortality and biological reference points of Siganus rivulatus and suggest a proper fishery management plan for fishery regulations. Materials and methods. The sudy was conducted between July 2016 and June 2018. Fish samples were collected from the Gulf of Gökova small-scale fishery. The total mortality (Z), natural mortality (M), fishing mortality (F curr), and exploitation rate (E curr) were determined and compared with the biological reference points: the optimum fishing mortality (F opt), fishing mortality limit reference point (F lim), optimum exploitation rate (E opt). Results. Total mortality (Z), natural mortality (M), fishing mortality (F curr), and exploitation rate (E curr) were found to be 0.67, 0.32, 0.35, and 0.52, respectively. Furthermore, biological reference points (F opt , F lim , E opt) attained values of 0.16, 0.21, and 0.33 cm, respectively. Conclusion. The fishing pressure for Siganus rivulatus stocks the Gulf of Gökova should decrease for the sake of the sustainability of this resource.

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Contribution to some biological aspects of invasive marbled spinefoot (Siganus rivulatus, Forsskål 1775) from the Turkish coast of southern Aegean Sea

Cited by 5 publications

References 19 publications

Small-scale fishery catch composition in Rhodes (Eastern Mediterranean Sea)

Small-scale fishery catch composition in Rhodes (Eastern Mediterranean Sea)

Health risk assessment of methyl mercury from fish consumption in a sample of adult Qatari residents

Mortality and exploitation of marbled spinefoot, Siganus rivulatus (Actinopterygii: Perciformes: Siganidae), from southern Aegean Sea small-scale fishery

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