Recent changes in the fish fauna of Lake Bafa, Aegean region of Turkey

Sarı, Hasan M.; Balık, Süleyman; Bilecenoğlu, Murat; Türe, Gökhan

doi:10.1080/09397140.1999.10637783

Cited by 20 publications

(19 citation statements)

References 6 publications

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“…The reason why such species do not venture into mesohaline waters closer to their isosmotic state remains difficult to explain. The sensitivity of some freshwater fish species to even very low salinities, however, is indicated by the extinction of four taxa from Lake Bafa (Turkey) as a result of salinization occurring in this predominantly freshwater system during the 1990s (Sari et al, 1999).…”

Section: Salinitymentioning

confidence: 99%

Why are there so few freshwater fish species in most estuaries?

Whitfield

2015

Journal of Fish Biology

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The freshwater fish assemblage in most estuaries is not as species rich as the marine assemblage in the same systems. Coupled with this differential richness is an apparent inability by most freshwater fish species to penetrate estuarine zones that are mesohaline (salinity: 5·0-17·9), polyhaline (salinity: 18·0-29·9) or euhaline (salinity: 30·0-39·9). The reason why mesohaline waters are avoided by most freshwater fishes is difficult to explain from a physiological perspective as many of these species would be isosmotic within this salinity range. Perhaps, a key to the poor penetration of estuarine waters by freshwater taxa is an inability to develop chloride cells in gill filament epithelia, as well as a lack of other osmoregulatory adaptations present in euryhaline fishes. Only a few freshwater fish species, especially some of those belonging to the family Cichlidae, have become fully euryhaline and have successfully occupied a wide range of estuaries, sometimes even dominating in hyperhaline systems (salinity 40+). Indeed, this review found that there are few fish species that can be termed holohaline (i.e. capable of occupying waters with a salinity range of 0-100+) and, of these taxa, there is a disproportionally high number of freshwater species (e.g. Cyprinodon variegatus, Oreochromis mossambicus and Sarotherodon melanotheron). Factors such as increased competition for food and higher predation rates by piscivorous fishes and birds may also play an important role in the low species richness and abundance of freshwater taxa in estuaries. Added to this is the relatively low species richness of freshwater fishes in river catchments when compared with the normally higher diversity of marine fish species for potential estuarine colonization from the adjacent coastal waters. The almost complete absence of freshwater fish larvae from the estuarine ichthyoplankton further reinforces the poor representation of this guild within these systems. An explanation as to why more freshwater fish species have not become euryhaline and occupied a wide range of estuaries similar to their marine counterparts is probably due to a combination of the above described factors, with physiological restrictions pertaining to limited salinity tolerances probably playing the most important role.

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Section: Salinitymentioning

confidence: 99%

Why are there so few freshwater fish species in most estuaries?

Whitfield

2015

Journal of Fish Biology

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“…On the other hand, the contribution of Bafa lake to EMA‐2 was a remarkable of 15 tonnes in 1956 (Artüz, 1958) up to 73 tonnes in the 1980s (Kasparek, 1988). The increase of the European eel population is explained by the low number of fishers and the extinction of its predator, Siluris glanis in Bafa lake (Sarı et al., 1999). The recorded European eel catch data is still as high as 41 tonnes in 2018 in Bafa lake (Tosunoğlu & Ünal, 2019).…”

Section: Resultsmentioning

confidence: 99%

Assessment of The Annual European eel ( Anguilla Anguilla Linnaeus, 1758) Catches In Three Suggested Major Monitoring areas To Support The development of eel fishery management system In Turkey

Özdilek

Özdılek

2020

J Appl Ichthyol

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Summary Thirteen river basins draining into the Marmara, Aegean and Mediterranean Seas were selected for evaluation of European eel (Anguilla Anguilla L., 1758) catch in Turkey. These basins were grouped into three so‐called “eel monitoring area” (EMA). The official province‐based annual landing data between 1996 and 2018 were assessed for each of the monitoring areas. Statistically significant decreases over the years were observed in the landing data in all of the monitoring areas. The adequate protection of the European eel standing stocks, particularly in some critical eel habitats such as Köyceğiz lagoon showed over time a small decrease in eel catches in EMA‐2. However, a substantial decrease was detected in the province of Adana, which includes the Seyhan and Ceyhan basins, and these are located in the EMA‐3. The catch data mainly based on the commercial fisheries and the restriction on export seems to be the main reason for the decline in catches in the three EMAs. Thus the suggested monitoring areas (EMAs) are needed to structure research programmes on basic knowledge on escapement ratio of migrating silver eels, arrival and upstream migration of glass eels in the rivers of each of the EMAs in order to build area specific management strategies. These monitoring areas may provide practical units that management can use in future fisheries regulations.

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“…Moreover, residuals from agricultural fertilizers and pesticides upstream in the Soke Plains are threatening the fish and bird populations (Koc 2008). Subsequently, stenohalin species such as Cyprinus carpio (Common Carp) has disappeared from the lake (Sari and Bilecenoglu 2002;Sari et al 1999) and Acanthobrama mirabilis ladiges (Ulubat Fish), an endemic of the northern Mediterranean, almost came to the point of extinction (Sari et al 1999). Recently, the General Directorate of State Hydraulic Works (GDSHW) has initiated a project titled "Protecting the Natural Life and Ecological Balance of Lake Bafa".…”

Section: Study Areamentioning

confidence: 99%

Analyzing landscape changes in the Bafa Lake Nature Park of Turkey using remote sensing and landscape structure metrics

Esbah

Deniz

Kara

et al. 2009

Environ Monit Assess

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Bafa Lake Nature Park is one of Turkey's most important legally protected areas. This study aimed at analyzing spatial change in the park environment by using object-based classification technique and landscape structure metrics. SPOT 2X (1994) and ASTER (2005) images are the primary research materials. Results show that artificial surfaces, low maqui, garrigue, and moderately high maqui covers have increased and coniferous forests, arable lands, permanent crop, and high maqui covers have decreased; coniferous forest, high maqui, grassland, and saline areas are in a disappearance stage of the land transformation; and the landscape pattern is more fragmented outside the park boundaries. The management actions should support ongoing vegetation regeneration, mitigate transformation of vegetation structure to less dense and discontinuous cover, control the dynamics at the agricultural-natural landscape interface, and concentrate on relatively low but steady increase of artificial surfaces.

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Recent changes in the fish fauna of Lake Bafa, Aegean region of Turkey

Cited by 20 publications

References 6 publications

Why are there so few freshwater fish species in most estuaries?

Why are there so few freshwater fish species in most estuaries?

Assessment of The Annual European eel ( Anguilla Anguilla Linnaeus, 1758) Catches In Three Suggested Major Monitoring areas To Support The development of eel fishery management system In Turkey

Analyzing landscape changes in the Bafa Lake Nature Park of Turkey using remote sensing and landscape structure metrics

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