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    Age, Growth and Reproduction of Silvery Pout (Gadiculus argenteus Guichenot, 1850) in the Saros Bay (Northeastern Aegean Sea)
    (Springer International Publishing Ag, 2019) İşmen, Ali; Yigin, Cahide Cigdem; Ihsanoglu, Mukadder Arslan; Oz, Melike Idil
    The age, growth and reproduction of Silvery Pout (Gadiculus argenteus), caught in the Bay of Saros (Northeastern Aegean Sea) between April 2005 and September 2008, were investigated. The total length and weight of the G. argenteus ranged from 5.5 cm to 16.8 cm in total length (TL) and from 1.6 g to 30.7 g in weight. The length-weight relationships were estimated W = 0.011*TL2.924.Age data derived from otoliths readings were used to estimate the growth parameters of the von Bertalanffy equation. The population growth parameters for G. argenteus were estimated as L-infinity = 14.97 cm, K = 0.28 year(-1) and t(0) = -1.69 year. The maximum age was 5 years. The data on maturity stages indicated that length at 50% maturity (L-50) were 8.94 cm TL for G. argenteus. Monthly values of the gonadosomatic index indicated that reproduction period of G. argenteus was determined between December and March.
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    Length-Weight and Otolith Morphometry Relationships of Hoplostethus mediterraneus Cuvier, 1829 from the Saros Bay, Northern Aegean Sea
    (Springer Int Publ Ag, 2025) İşmen, Ali; Yigin, Cahide Cigdem; Oz, Melike Idil; Ihsanoglu, Mukadder Arslan
    The relationship between total length (TL) and total weight (TW) and the morphometric relationships of the otolith between total length and otolith length (OL), total length and otolith weight (OW) and otolith length and otolith weight of Hoplostethus mediterraneus were examined in Saros Bay, North Aegean Sea, T & uuml;rkiye. The samples were collected with commercial trawls in Saros Bay from September 2006 to September 2008. A total of 970 specimens were caught at depths of 100-500 m. The average value of fish length was 11.86 +/- 0.14 cm (4.0-22.1 cm), and weight 32.2 +/- 1.0 g (0.83-148.75 g). Otolith size was measured with a minimum of 4.31 mm and a maximum of 12.88 mm. The relationships between TL and TW, OW and OL, OL and TL, OW and TL and OW and OL were determined as TW = 0.010*TL3.10 (r2 = 0.99), OW = 0.0004*OL2.64 (r2 = 0.99), OL = 0.055*TL + 0.564 (r2 = 0.98), OW = 0.0002*TL2.38 (r2 = 0.98), and OW = 0.0004*OL2.64 (r2 = 0.99). The high correlation coefficients (r(2) values) demonstrate the reliability of the established equations, offering a robust framework for estimating the size and weight of this species based on otolith measurements. This study provides crucial insights into the growth patterns and morphometric relationships of Hoplostethus mediterraneus, which can be used to enhance fishery management and conservation efforts in Saros Bay.
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    Öğe
    Mass mortality report of the critically endangered Pinna nobilis (Linnaeus, 1758) in Gokceada (North Aegean Sea, Turkey)
    (Ege Univ, Fac Fisheries, 2022) Acarli, Deniz; Acarli, Sefa; Oz, Melike Idil
    In August 2020, a total area of 38000 m(2) around Gokceada has been scanned to determine the current population status of Pinna nobilis. 9 stations (Yildizkoy, Manastir, Marmaros, Gizli Liman, Laz Koyu, Kapikaya, Karacavus, Karacavus shore and Kefalos) have been detected by means of SCUBA and ABC diving techniques. All specimens were found dead (total mass mortality of 100%). The total length range of P. nobilis was between 30.8 - 38.3 cm.
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    Sightings of cetaceans in the Western Antarctic Peninsula during the first joint Turkish-Ukrainian Antarctic Research Expedition, 2016
    (Tubitak Scientific & Technological Research Council Turkey, 2017) Ozturk, Bayram; Tonay, Mehmet Arda; Oz, Melike Idil; Yilmaz, Izzet Noyan; Ergul, Halim Aytekin; Ozturk, Ayaka Amaha
    During the cetacean surveys of the first Turkish-Ukrainian Antarctic Research Expedition conducted on 5-8 April 2016 in Lemaire Channel, Penola Strait, Flanders Bay, southern Gerlache Strait, and southern Neumayer Channel in the Western Antarctic Peninsula, 74 humpback whales (Megaptera novaeangliae) in 24 sightings and 11 Antarctic minke whales (Balaenoptera bonaerensis) in 6 sightings were recorded. The overall encounter rate (number of sightings/survey effort in nautical miles) was 0.333 (0.266 for humpback whale, 0.066 for Antarctic minke whale). According to the sighting distribution, the Lemaire Channel and Penola Strait are important migration and feeding habitats for whales. Five humpback whales were photo-identified individually by natural features on their flukes; one of them had a match in the Antarctic Humpback Whale Catalogue. The matched individual was first recorded on 30 August 2007 at Salinas, Ecuador.