Ertan Taskavak

Ertan Taskavak
Ege University · Faculty of Fisheries

Professor

About

136
Publications
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1,606
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Publications

Publications (136)
Article
Full-text available
We, here, aimed to determine the presence of Anguillicola crassus, a swim bladder parasite, in 89 (male: 45, female: 44) dead European eel specimens obtained seasonally between 2020-2021 from a regional fisherman, who has fished with fyke net in the locality Tuzla of Izmir Bay, Eastern Aegean Sea. Out of 21 male European eels caught in winter, only...
Article
Full-text available
Temporal changes of the morphological indices (Relative Gut Length (RGL), Fullness Index (FI), Hepatosomatic Index (HSI), Visceral Index (VSI), Gonadosomatic Index (GSI) and Fulton condition)) in 122 (♂: 94, ♀: 19, immature: 9) common sole were evaluated. Total length-weight relationships were calculated as W = 0.085TL3.01 and W = 0.0547TL2.40 in f...
Technical Report
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In this study, we discussed the size of devil firefish Pterois miles (Bennett, 1828) specimen obtained from commercial fishermen who trawl off the coast of Taşucu, Silifke (36°3'32.70"N; 34°3'51.33"E). The obtained specimen was 335 mm in total length, 258 cm in standard length, and 0.696 kg in weight. The dissected specimen was a mature male. The t...
Article
Full-text available
This study aims to determine the presence of sexual dimorphism based on morphometric charac-teristics in 69 (female: 44 male: 25) Syngnathus abaster specimens captured with seine-net from Lake Bafa’s coasts (Muğla) between November 2014 and March 2016. Female/Male ratio of sam-ples is 1/0.6. Based on morphometric measure-ments, the presence of sexu...
Article
Full-text available
The reproductive characteristics of the Short-snouted Seahorse, Hippocampus hippocampus, was studied in the eastern Black Sea shore over a one-year period. Average standard length was 10.38 cm (6.15–13.3 cm) and weight 1.88 g (0.68–3.02 g). Males were slightly more common than females (females: 48%), but the difference was statistically insignifica...
Article
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Sardina pilchardus is a multiple spawning fish, i.e., the species that spawns periodically during the spawning period. In order to examine the reproduction biology of the species, the specimens were obtained in the known spawning period indicated by the current literature obtained from fishers who were commercially fishing in December 2018 and Janu...
Conference Paper
In this study, together with of liver, gonad, condition values, it was aimed to determine various morphometric measurements of some body parts of Short snouted seahorse, Hippocampus hippocampus, distributed in the vegetated shores of the county Tirebolu for 4 months in 2014. A total of 131 (♀: 70, ♂: 61) specimens was obtained from fishermen fishin...
Article
Full-text available
This study aims to determine various relationships between liver, gonad and body weights of the two pipefish species caught in two breeding seasons from the Bafa Lake (Muğla) coasts between 2014 -2016. Using beach seine-net in the lake, a total of 208 pipefish specimens (79 Synathus abaster and 129 Synathus acus) were sampled. L-W relationship and...
Article
Full-text available
In this research, a preliminary study was carried out in January and February 2014 to determine the fecundity of the whiting species in Tirebolu, Eastern Black Sea. After the total length (cm) and weight (0.01 g) of the 70 fish specimens were measured in the laboratory, they were dissected for sex determination. Using the 20 ovaries at the third an...
Article
Full-text available
A total of 1492 specimens of sand smelt, Atherina boyeri, was collected from the coasts of Candarlı Bay (North Aegean Sea, Turkey) during 2007-2008, to determine their stomach content compositions. Of the 460 stomachs examined, 258 (56.1%) were found with prey items. Zooplanktonic organisms were the main prey items in terms of abundance for the aut...
Article
Full-text available
In this research, a preliminary study was carried out in January and February 2014 to determine the fecundity of the whiting species in Tirebolu, Eastern Black Sea. After the total length (cm) and weight (0.01 g) of the 70 fish specimens were measured in the laboratory, they were dissected for sex determination. Using the 20 ovaries at the third an...
Poster
Full-text available
SOME REPRODUCTIVE FEATURES OF GREAT PIPEFISH IN COASTS OF TİREBOLU (EAST BLACK SEA)
Presentation
Full-text available
This study aims to contribute solution of the problems in the taxonomic status and distribution of E. orbicularis in the Aegean and Central Anatolian regions of Turkey
Article
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We assessed the size of the population of the African Softshell Turtle, Trionyx triun- guis, in Dalaman (Muğla, Turkey), which is considered to be the largest population of the species in the Mediterranean, by using the Jolly-Seber mark-recapture method. A total of 415 individuals were caught during the summer months of 2009 to 2011, of which 148 w...
Poster
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This investigation aims to examine histologically the ovary structure of H.hippocampus.
Article
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In this study, the prey composition of broadnosed pipefish (Syngnathus typhle) that has distributed in the Aegean Sea coasts was seasonally determined between the years of 2007 and 2008. The seasonal differences were determined in gut contents. In Spring, unidentified and vegetative tissues were the most important prey group in ten prey groups X2=1...
Article
Full-text available
The aquaponics is a bio-integrated food production system that, aquaculture (fish production in intensive culture ponds) and hydroponics (plant growing in water with nutrient solution) plant production are made together. This study was designed in the shape of a closed system; two different feeding dose (3% and 4% of the live weight of the pool) Gr...
Article
Full-text available
The Euphrates Softshell Turtle, Rafetus euphraticus (Family Trionychidae), is a medium-sized (maximum recorded carapace length 680 mm), freshwater turtle thought to be most closely related to the eastern Asian species Rafetus swinhoei. The species inhabits diverse habitats, including rivers, streams, ponds, lakes, reservoirs, marshlands, and artifi...
Conference Paper
Full-text available
The Morocco dentex, Dentex maroccanus, is an important demersal commercial sparid species inhabiting throughout the Mediterranean at the depths from 20 to 500 m. Morocco dentex ecologically prefers deep and higher salinity waters. In the Aegean Sea (Izmir Bay), a basin of the eastern-central Mediterranean, the sparids represent important components...
Poster
Full-text available
In this research, stomach lengths and occurence of gut contents (NO) of Syngnathus acus, Syngnathus typhle and Nerophis ophidion was examined in which collected between 2006 and 2008 years in different habitats (vegetated and sandy-vegetated etc.) from coasts of Aegean Sea by using beach seine net. The zooplanktonic preys were mostly consumed by Sy...
Article
Full-text available
Male tortoises are occasionally presented with a prolapsed phallus (penis). The penis is retracted except during mating, trauma, or death; it lies in the ventral floor of the cloaca. Male Euphrates soft-shelled turtle constituted the study material. Clinically, necrotic areas in the phallus were observed. After the local anesthesia and analgesia, p...
Article
Full-text available
Leatherback sea turtle, Dermochelys coriacea, is a pelagic and circumglobal species and listed Vulnerable in IUCN Red List. Although the species mainly inhabits the Atlantic and Paci c Oceans and occasionally enters the Mediterranean Sea. Most of the sightings have been made in the western part of the Mediterranean. More than a decade after the spe...
Article
Full-text available
About knowledge of reproductive success of broad-nosed pipefish, Syngnathus typhle, has not yet determined for the Turkish coasts, Aegean Sea. Three groups of oocyte in the ovaries of females were determined in the present study. In the study, egg diameter in pregnant males was approximately equal in females. Average hydrated oocyte diameters were...
Article
Full-text available
The endangered Euphrates soft-shelled turtle, Rafetus euphraticus, is endemic to the Mesopotamian River Basin in the Middle East. Within recent decades, populations of this aquatic species have been heavily depleted and severely fragmented owing to habitat alteration and destruction by drainage and hydroelectricity dam constructions. Continuing hab...
Conference Paper
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Background: The family Syngnathidae exhibits one of the most specialized forms of parental care with the female depositing egg in a specialized incubating area, located either on the abdomen or tail of the male who, according the each species. In Syngnathus typhle, all the eggs in male’s brood pouch are usually at the same developmental stage, even...
Article
Full-text available
zet: Ege Denizi'nde bulunan beş derin deniz balığı: Argentina sphyraena, Glossanodon leioglossus, Chlorophthalmus agassizi, Hoplostethus mediterraneus ve Capros aper 2003 bahar mevsimi süresince ticari trol balıkçıları tarafından hedef dışı av olarak elde edilen örnekler olarak çalışılmıştır. Türlerin besin kompozisyonlarını belirlemek için mide iç...
Article
Full-text available
This paper presents the first attempt to use an ethnoecological approach to examine issues relevant to seahorse conservation and management in Turkey. Between 1999 and 2008, we visited 32 localities, and interviewed 394 people involved in artisanal fishery. We considered the following aspects as positive for the conservation of seahorses and th...
Article
We present a detailed morphological review of the leaf-toed gecko, Asaccus elisae from Birecik, Şanliurfa (Southeastern Anatolia), as well as a comparison with specimens from Iran, Iraq, and Syria. The great majority of morphological characteristics of the Birecik sample are in accordance with those given for A. elisae (Werner, 1895).
Article
Full-text available
The relationships of length—weight and age, and otolith length—total length in Solea solea were examined. The length and age of wild-caught specimens were compared with the length and age calculated theoretically, together with the results from the back-calculated lengths-at-age. Five different groups of total length were designated, and otolith le...
Article
Full-text available
1. The aim of the study was to investigate nearshore fish community structure in the different habitat types (sand, gravel, and seagrass) in Çandarlı Bay (Northern Aegean Sea) from May 2007 to June 2008. 2. The samples were collected with beach seine net at the depths of 0.5 to 1.5 m. Evenness and Shannon-Weaver diversity indices were calculated to...
Article
Full-text available
Seahorses (genus: Hippocampus) are traded globally for use in traditional medicines, souvenirs and as aquarium fishes. Between 1999 and 2008, surveys were made in order to expose the situation (species distribution, seahorse fishery and trade etc.) of seahorses in Turkey. The surveys were conducted on south and west coasts of Turkey where fisheries...
Article
Full-text available
zet: Bu araştırmada, İzmir Körfezi'nde dağılım gösteren gümüş balığı Atherina boyeri Risso, 1810'nın bazı biyometrik özellikleri incelenmiştir. Aralık 2002-Ekim 2003 tarihleri arasında incelenen toplam 596 örneğin en küçük ve en büyük tam boy değerleri sırasıyla, 43 mm, 97 mm olarak belirlenmiştir. Türün tam boy-ağırlık ilişkisi ise W=0.000003*L 3....
Article
Full-text available
Females of Syngnathus typhle have larger mouth structure than males, resulting in pronounced sexual dimorphism with respect to the mouth width/mouth height in length group II (0.54 and 0.67 respectively). The mouth was relatively wider in females compared with males (1.32mm female; 1.25mm male) and higher (2.67mm female; 2.33mm male). Additionally...
Article
Full-text available
This study investigates the diet of adult wild seahorses, Hippocampus hippocampus and Hippocampus guttulatus from the Aegean Sea, along the coasts of Turkey. A total of 47 fish stomachs (H. hippocampus = 25, H. guttulatus = 22) were analyzed to determine diet according to fish size and sex. Twenty one of specimens of H. hippocampus (84%) had prey i...
Article
Full-text available
This study examined the gut content of 43 Nerophis ophidion individuals obtained from Izmir Bay, Eastern Aegean Sea. A four season sampling process provided 7 groups of prey: Ostracoda, Amphipoda, Gastropoda, Cirripedia, Decapod crustacea, bentic Cinideria and Copepoda (Calanoid, Harpacticoid, Cyclopoid-Sapphirina sp., E. acutifrons and Monstrilloi...
Article
Full-text available
Seasonal Condition Factors of Syngnathid Species Caugth from Aegean Sea Coasts. In this research, 1122 syngnathid fish samples (total fish size 1130) were obtained between 2002-2006 to examine the seasonal condition factors which were found in vegetated coasts of Aegean Sea. As a result of present study 4 pipefish species Syngnathus abaster (n=8),...
Data
Full-text available
Length- weight relationships were calculated for 22 fish species caught from Candarli Bay in the north Aegean Sea, Turkey. Between December 2006 and January 2008 beach seine net was use to capture specimens and sampling was made in vegetated and sandy bottoms at the depths up to 1.5 m. A total of 2605 fish specimens were weighed and measured. The s...
Article
In the last decade, Asian populations of Testudo graeca were split into as many as 10 species based on morphology and morphometry and then subsequently synonymized based on genetic evidence. We generate new morphometric data for six of these disputed species from Turkey, a major center of morphological and genetic diversity for Asian T. graeca. We...
Article
Full-text available
Length- weight relationships were calculated for 22 fish species caught from Candarli Bay in the north Aegean Sea, Turkey. Between December 2006 and January 2008 beach seine net was use to capture specimens and sampling was made in vegetated and sandy bottoms at the depths up to 1.5 m. A total of 2605 fish specimens were weighed and measured. The s...
Article
Full-text available
A total of 112 stomachs of the Great Pipefish, Syngnathus acus Linnaeus, 1758 (56 females and 38 males), was collected in İzmir Bay (Aegean Sea) and analysed in order to determine the feeding habits. 95 specimens (85.6%) were found with prey items in their stomachs. Zooplanktonic organisms were the main food and in terms of numerical (NO%) and freq...
Article
Full-text available
Age and feeding habits of Atlantic spotted flounder, Citharus linguatula, from Izmir Bay (central Aegean Sea coast of Turkey) were studied. Total length ranged between 6.8 and 23.2 cm. Overall female: male ratio was 1:1.34 and age distribution of the samples I and IV years (otolith readings). Atlantic spotted flounder grew positively allometrically...
Article
Full-text available
The Nile soft-shelled turtle, Trionyx triunguis is known from the riverine and coastal environments of eastern Mediterranean countries (Turkey, Syria, Lebanon and Israel) and most of Africa, except for the waterways of the southern, north-western, and northern part of the continent. Trionyx triunguis is a mainly freshwater species adapted to modera...
Article
Full-text available
Age and feeding habits of Atlantic spotted flounder, Citharus linguatula, from Izmir Bay (central Aegean Sea coast of Turkey) were studied. Total length ranged between 6.8 and 23.2 cm. Overall female: male ratio was 1:1.34 and age distribution of the samples I and IV years (otolith readings). Atlantic spotted flounder grew positively allometrically...
Article
Full-text available
With the aim of determining the reproductive characteristics and mating periods specific to Syngnathus acus, a study was carried out from December 2001 to November 2002 in the Camalti Lagoon (Izmir Bay, Aegean Sea). Study material consisted of 605 individuals that were captured using a beach seine in areas with vegetation. 43% (n=261) of the captur...
Article
Full-text available
Stomach contents of 148 hollowsnout grenadier, Caelorinchus caelorhincus (RISSO, 1810), were examined. Crusta- ceans were found to be most important prey group in the diet. Polychaetes constituted the second most important prey group. Cha- etognathans were only occasionally eaten.
Chapter
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Length–weight relationships of three macrourid fishes (saddled grenadier Caelorinchus caelorhincus, glasshead grenadier Hymenocephalus italicus and bluntsnout grenadier Nezumia sclerorhynchus) from Sigacik Bay on the Turkish coast of the Aegean Sea are presented. Overall, 923 specimens of three different species of the family Macrouridae were weigh...