Inter and intra annual variation in body condition of the Black Sea anchovy, Engraulis encrasicolus ponticus—Potential causes and consequences

Gücü, Ali Cemal; Genç, Yaşar; Başçinar, Nimet Selda; Dağtekin, Murat; Atilgan, Elvan; Erbay, Murat; Akpinar, İlkay Özcan; Kutlu, Sebahattin

doi:10.1016/j.fishres.2018.03.015

Cited by 6 publications

(8 citation statements)

References 37 publications

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“…However, as it is difficult to distinguish the parasite effect from other effects on fish condition in the field, it seems that the effects of Nematodes have not been adequately addressed in the literature. In this study, it is believed that the approach, sampling design, and the method applied helped remove the three major effects, namely those associated with gender, seasonality (Gücü et al, 2018), and food availability (Shulman and Love, 1999). The remaining variability in the indicators and growth rate, which was attributed to the parasite infections, suggested that the parasite in fish reduced the body condition (Table 2) and lessened the energy deposition (as inferred from HSI; Table 3).…”

Section: Discussionmentioning

confidence: 91%

“…Environmental factors, food availability, diseases, pollution, and some other biological elements like parasite infections are some of the parameters that eventually affect the fish condition and cause an economic loss for the fish market. (Dobson and May 1987;Özer et al, 2015;Ferrer-Maza et al, 2016;Gücü et al, 2018). For the Black Sea anchovy case, any factor plays a critical role in the stock health, especially in their summer feeding season.…”

Section: Introductionmentioning

confidence: 99%

“…For the Black Sea anchovy case, any factor plays a critical role in the stock health, especially in their summer feeding season. They gain their condition for their reproductions and winter migrations (Shulman and Love, 1999;Gücü et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Spatial variation of larval ascaridoid nematode (Nematoda: Chromadorea: Ascaridoidea) infections in the Black Sea anchovy (Engraulis encrasicolus)

Akkus¹,

Gücü²

2021

Turk J Zool

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This study evaluates the Black Sea anchovy population infected by parasitic Ascaridoid Nematode larva in the Southern Black Sea. It assesses the larva's effect on fish body condition, energy stored in the body, and anchovy growth. For this, anchovies sampled on July 10-31, 2018, from 30 different stations were examined, and 11.8% of the 825 anchovies were found infected. The observed infection rate was higher on the western side of the study area, suggesting that this rate may be used as a biomarker for the western stock. Age and size of the anchovies play a significant role in the prevalence. Both of the fish well-being indicators (condition and hepatosomatic index) were lower in the parasitized fish. It may support the view that the larva weakened its paratenic host against its predator to facilitate its transfer to a definite host. The observed low infection rate, which is not considered an economic threat to fisheries, is linked to the warm-affinity of the anchovy. Moreover, considering the trophic role of the anchovy in the ecosystem, it is very likely that the infestation rate at the upper trophic levels is higher than that of anchovy. Therefore, a better understanding of the life cycle of the Nematodes in the Black Sea, their hosts in their life cycle, and the consequences of climate change is essential.

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Section: Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Spatial variation of larval ascaridoid nematode (Nematoda: Chromadorea: Ascaridoidea) infections in the Black Sea anchovy (Engraulis encrasicolus)

Akkus¹,

Gücü²

2021

Turk J Zool

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“…Environmental factors, food availability, disease, pollution, and other biological elements such as parasite infections are some of the most important parameters that ultimately affect the fish health, causing an economic loss for the fish market (Ozer et al, 2015;Ferrer-Maza et al, 2016;Gücü et al, 2018). Fish populations are subject to numerous natural and anthropogenic factors that reduce their abundance (Sinderman, 2002).…”

Section: Fig 3 Nematodes Identified At Fish Speciesmentioning

confidence: 99%

Degree of Nematodes Worm Infection in Pelagic Fish Populations from the Romanian Black Sea waters

Țoțoiu¹,

Niță²,

Abaza³

et al. 2021

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"Pelagic fish species can be affected by a series of infectious and parasitic diseases. The data used for this study are represented by the biological material collected between 2018 and 2019, from trap nets along the Romanian Black Sea waters. To establish the degree of parasitism, the following species of pelagic fish were studied: Sprattus spratus -sprat, Engraulis encrasicholus - anchovy and Trachurus mediterraneus- horse mackerel. Four species of endoparasites were identified, belonging to nematodes, as follows: Hysterothylacium aduncum, Contracaecum sp., Porrocaecumsp. and Anisakis sp. The parasites, especially found as larvae, more in free state and less trapped in the internal organs, infested the abdominal cavity, leading to degenerations, atrophies and reduction of the fish functions. The intensity of the parasitism infestation could be lethal, the size of the stocks being severely damaged. At the analysed fish species, the infestation degree was under 20 parasites per host, a low number of species recording the maximum value of 40 parasites per host. The parasites tend to accumulate with the increase of the fish's size, young stages being less affected. Key-Words: parasites, fish, nematodes, intensity, infestation degree "

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“…In particular, large-scale changes in ocean-atmospheric forcing, illustrated by the North Atlantic Oscillation (NAO) index were shown to influence temperature, precipitation, nutrient concentration, and primary production in the region (Oguz et al, 2006). The effect of the NAO channeled either through changes in temperature or nutrient availability, has been argued to also affect the recruitment and productivity of the Black Sea anchovy stock (Gücü et al, 2018). Given the importance of the Black Sea anchovy for local and national economies, modeling frameworks evaluating flexible management targets accounting for changes in stock productivity are needed to ensure long-term sustainable exploitation.…”

Section: Introductionmentioning

confidence: 99%

Fisheries Reference Points under Varying Stock Productivity and Discounting: European Anchovy as a Case Study

2022

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European anchovy (Engraulis encrasicolus) is the main commercially exploited fish stock in the Black Sea region, providing a vital source of livelihood and revenue for local communities and national economies. In recent decades, the Black Sea anchovy stock has faced many human-induced threats, including overfishing, eutrophication, invasive species, and climate change while these threats have raised concerns about the status and long-term productivity of the stock. To ensure sustainable levels of exploitation under potential future changes in stock productivity, we here estimate and compare a suite of biological and economic reference points under different levels of stock productivity and discount rates using an age-structured bioeconomic model setup. Our model simulations showed that optimal fishing mortalities achieving maximum sustainable yield (FMSY) and maximum economic yield (FMEY) increase at higher stock productivity but are always lower than the historically high mean levels of exploitation. Furthermore, we illustrate that the stock biomass at maximum economic yield (BMEY) is larger than the stock biomass at maximum sustainable yield (BMSY) at all stock productivities and discount rates, except at low stock productivity under high levels of discounting (i.e., 10%, 20%). By illustrating the ecological and economic benefits of reducing exploitation rates, we expect that our estimated reference points can add value to the decision-making process for the management of the European anchovy fishery and ensure long-term sustainable management even under future climate-driven changes in stock productivity.

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Inter and intra annual variation in body condition of the Black Sea anchovy, Engraulis encrasicolus ponticus—Potential causes and consequences

Cited by 6 publications

References 37 publications

Spatial variation of larval ascaridoid nematode (Nematoda: Chromadorea: Ascaridoidea) infections in the Black Sea anchovy (Engraulis encrasicolus)

Spatial variation of larval ascaridoid nematode (Nematoda: Chromadorea: Ascaridoidea) infections in the Black Sea anchovy (Engraulis encrasicolus)

Degree of Nematodes Worm Infection in Pelagic Fish Populations from the Romanian Black Sea waters

Fisheries Reference Points under Varying Stock Productivity and Discounting: European Anchovy as a Case Study

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