Growth, sex ratio, and reproduction of striped red mullet (Mullus surmuletus L.) were determined from 520 specimens collected in the northwestern Aegean coast of Turkey from September 2009 to July ...2010. Total length ranged from 7.7 to 17.0 cm while weight varied between 3.50 and 58.9 g. According to the length-weight relationship, positive allometry was confirmed for both sexes. The sex ratio was skewed in favour of males (1:1.73). The monthly values of gonadosomatic index (GSI) of females indicated that spawning occurred mainly between April and September with a peak in July. Values of Condition factor (CF) and Hepatosomatic index (HSI) varied between 0.71-1.57 and 0.10-1.43, respectively.Original Abstract: Starost, rast i smrtnost trlje kamenjarke, (Mullus surmuletus L.) procijenjene su kod 520 jedinki prikupljenih na sjeverozapadnoj obali Egejskog mora, Erdemitski zaljev u Turskoj od rujna 2009. do srpnja 2010. Ukupna duljina jedinki je u rasponu od 7,7 do 17,0 cm, a masa je kolebala izmedu 3,50 i 58,9 g. Prema duzinsko-tezinskom odnosu, ustanovljena je pozitivna alometrija za oba spola. Omjer zastupljenosti spolova bio je u korist muzjaka (1: 1,73). Mjesecne vrijednosti gonadosomatskog indeksa (GSI) za zenke pokazuju da se mrijest obavlja posebice u razdoblju travanj - rujan, sa vrhuncem u srpnju. Vrijednosti kondicijskog faktora (CF) i hepatosomatskog indeksa (HSI) kolebali su izmedu 0.71-1.57 i 0.10-1.43, respektivno.
Age, growth, sex, and condition of different populations of the Atlantic horse mackerel, Trachurus trachurus (L.) in the Turkish seas were determined from 300 specimens between November 2010 and ...March 2011. Fork length and total weight of the specimens ranged from 10.0 to 18.9 cm and from 12.81 to 81.71 g, respectively. Maximum age group was determined as IV, and sex ratio in samples did not differ significantly from a 1:1 ratio for all locations except for Bandirma, where it was skewed towards males (c 2 test, p>0.005). Weight increased allometrically for Zonguldak (BS), Bandirma (MS1), Edremit (AS1), Izmir (AS2), Marmaris (AS3) populations together with b=2.881, b=2.973, b=3.210, b=3.120, b= 2.820 respectively except for b=3.004 for Sarkoy (MS2) as isometry.Original Abstract: Starost, rast, spol i stanje razlicitih populacija atlantskog saruna Trachurus trachurus (L) u turskim morima procijenjene su kod 300 jedinki u razdoblju od studenog 2010. do ozujka 2011. Duzina do repne peraje i ukupna masa jedinki u rasponu je od 10.0 do 18.9 cm, odnosno od 12.81 do 81.71 g. Najstarija dobna skupina oznacena je oznakom IV, dok se omjer zastupljenosti spolova nije znacajno razlikovao od odnosa 1:1 koji je ustanovljen na svim postajama, osim u Bandirmi gdje je bio u korist muzjaka (c2 test, p>0.005). Masa se na sljedecim postajama Zonguldak (BS) Bandirma (MSI), Edremit (AS1), Izmir (AS2), Marmaris (AS3), povecavala uz koeficijente alometrije b=2.881, b=2.973, b=3.210, b=3.120, b= 2.820 respektivno, osim za b=3.004 u Sarkoyu (MS2) koji ukazuje na izometriju.
We studied the reproductive traits in 23 of 190 individuals of
caught monthly in the Solhan Creek of the Murat River between April 2017 and March 2018. The sex ratio (F:M) was found to be 1:1.11. The ...macroscopic examination of the gonads and gonado-somatic index indicated that the reproductive period lasted from May to August with peak activity in May. The fecundity ranged from 2,000 to 9,000 oocytes, and it correlated with the total length and body weight. This work represents the first attempt to investigate the reproductive traits of the
population in the Solhan Creek. The results provide information on the reproductive biology and contribute to the conservation of the fish population and its sustainable management.
Feeding habits of the horse mackarel, Trachurus mediterraneus in Bandırma Bay, the Sea of Marmara were investigated in the years of 2013-2015. Stomach contents of 90 specimens collected by commercial ...vessels were analysed. The stomach contents were determined to consist of 2 major systematic groups: Crustacea (Copepoda, Cladocera, Mysidacea, Ampipoda, Decapoda), and Pisces. The predominant and preferred prey category was Crustaceans. Besides, Crustaceans were identified as the most important food items considering the index of relative importance (IRI). Howver, teleost eggs were occasional foods. Euphausiacea, was food category with especially abundant in spring while Copepoda was the most in autumn. Feeding intensity varied throughout 3 seasons (winter, spring, and autumn). The lowest and highest feeding intensities were recorded in winter and autumn, respectively. Euphausiids were observed to be dominant prey during winter and spring. The lowest and highest feeding intensities were recorded in winter and autumn, respectively. T. mediterraneus revealed carnivorous feeding habit and. Euphausiacea food item with highest occurrence.
Bu çalışmada; Rhodeus amarus’ un Ekim 2018 – Aralık 2018 tarihleri arasındaki helmint faunasının belirlenmesi amaçlanmıştır. Çalışma sonucunda; 51 adet R. amarus bireyinin 18’ nin bir ya da daha ...fazla parazit türü ile enfekte olduğu bulunmuştur. Konak balıkta toplam 3 adet ektoparazitik helmint türü tanımlanmış olup, üç farklı türe ait 34 parazit bireyine rastlanılmıştır. Bu parazitlerden Monogenea’ dan Dactylogyrus bicornis Malewitzkaja, 1941 (%17,6; 2 parazit/balık); Paradiplozoon homoion ( Bychowsky and Nagibina, 1959) (%11,7; 1,3 parazit/balık) konak balığın solungaçlarında, Digenea’ dan Clinostomum complanatum metaserkeri (Rhudolphi, 819) (%13,7; 1,1 parazit/balık) konak balığın solungaç boşluğunda kaydedilebilmiştir. Bu çalışmada, D. bicornis 9 balıkta toplam 18 adet bulunmuş olup, en yaygın parazit türü olarak. kaydedilmiştir. Parazit türlerine ait enfeksiyon yüzdeleri ile minimum, maksimum ve ortalama enfeksiyon yoğunlukları değerlendirilmiştir. Diğer taraftan, bu çalışma Susurluk Havzası balık faunasında yer alan R. amarus’ un helmint parazitleri üzerine yapılan ilk çalışmadır. Saptanan türlerden, P. homoion ise Türkiye’deki acı balıklarda ilk kez bu çalışma ile bildirilmiştir. Ayrıca bu çalışmada konak balıkta kaydedilen türlerden her biri Susurluk Çayı için yeni kayıttır ve Anadolu’ daki dağılımlarına yeni bir lokalite olarak eklenmiştir.
In this study; it was aimed to determine the helminth fauna of Rhodeus amarus in Susurluk Stream between October 2018 and December 2018. In result of this study; of fifty-one individuals of R. amarus, eighteen were found to be infected with one or more parasite species. A total of 3 ectoparasitic helminth species were identified in host fish and 34 parasites belonging to three different species were encountered. From these parasites; Dactylogyrus bicornis Malewitzkaja, 1941 ( Monogenea) (17.6%; 2 parasites / fish); Paradiplozoon homoion (Bychowsky and Nagibina, 1959) (Monogenea) (11.7%; 1.3 parasites / fish) in the gills of the host fish, Clinostomum complanatum metaserkeri (Rhudolphi, 819) (Digenea) (13.7%; 1.1 parasites / fish) of the host fish was recorded in the gill cavity. In this study, D. bicornis was found to be the most common parasite species as it was recorded in nine of a total of 18 fishes. Infection percentages of parasite species and minimum, maximum and average infection densities were evaluated. On the other hand, this study is the first study on the helminth parasites of R. amarus in the fish fauna of the Susurluk stream. P. homoion is first record for R. amarus in Turkey. In addition, the species recorded in the host fish in this study are the new record for Susurluk Stream and have been added to their distributions in Anatolia as a new locality.
Morphometric and meristic analyses of chub mackerel Scomber japonicus were used to discriminate stocks throughout the Black, Marmara, Aegean, and northeastern Mediterranean Seas. Morphometric and ...meristic analyses showed a similar pattern of differentiation between S. japonicus stocks and revealed a clear discreteness of two groups, northeastern Mediterranean (Antalya Bay-Iskenderun Bay) and the northern group, including the Aegean, Marmara, and Black Seas. Univariate analysis of variance showed significant differences between means of the samples for most morphometric and meristic descriptors. The contribution of each variable in distinguishing between the stocks for the first discriminant function revealed high contribution from head size measurements for morphometrics, and first and second dorsal fin rays for meristics. Plotting all specimens on the first two discriminant functions accounted for 76% of total variance for morphometric and 69% of total variance for meristic analyses, and both plots resulted in two main groupings. The overall random assignment of individuals to their original group was higher in morphometric than in meristic analysis.
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