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    The first record of the eggs of black wing flyingfish Hirundichthys rondeletii (Valenciennes, 1846) in the Turkish nearshores of the Aegean Sea (Gümüldür)
    (Turkiye Klinikleri Journal of Medical Sciences, 2018) Uygun O.; Hoşsucu B.
    Hirundichthys rondeletii is among the three flyingfish species showing distribution in the Turkish seas. However, the egg stages of Exocoetidae species found in the Turkish waters have not been documented. Flyingfish eggs were randomly obtained on 16 July 2016 on the coast of Gümüldür, at a depth of approximately 1 m from a sandy bottom. Samples were fixed in a 4% buffered formaldehyde solution. The eggs were described and illustrated. The diameters of spherical fish eggs were between 1.75 mm and 2.05 mm. They have bipolar filaments: a single filament on one pole and 28–33 filaments on the other pole. The maximum length of these filaments was 73 mm. Vitellus in the eggs was homogeneous and did not contain oil globules. The total egg number determined with the gravimetric method was 4319.91 ± 22. This is the first record of the eggs of black wing flyingfish H. rondeletii found in the Turkish waters. © TÜBİTAK.
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    The ichthyoplankton of Izmir bay (Central aegean sea of Turkey): 2008-2010 years study
    (2012) Taylan B.; Hoşsucu B.
    In this survey, we searched about the abundance, distribution and mortality rates of eggs and larvae belonging to the teleostei living in Izmir Bay between the years 2008 and 2010. For this purpose, we seasonally obtained the ichthyoplankton samples from 8 stations identified in the inner, middle and outer parts of the bay aboard the R.V.K. Piri Reis research vessel. We obtained 11612 eggs/m 2, 19 prelarvae/m 2, and 5277 larvae/m 2 throughout the survey and identified 24 species belonging to 17 families. The eggs and larvae of the species Engraulis encrasicolus (Linnaeus, 1758) were found to be dominant in station 2 (outer bay), in contrast eggs of Gadidae and larvae of Melucciidae, Myctophidae and Syngnathidae were found to be at least in Izmir Bay. © 2012 Zoological Society of Pakistan.
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    The ichthyoplankton of İzmir Bay: A one-year study of fish eggs and larvae
    (2002) Hoşsucu B.; Ak Y.
    This study was carried out in order to determine the species diversity, abundance, and distribution and seasonal frequency occurrence times of the eggs and larvae of Teleost fish in Izmir Bay during 1989-1990. A total of 32140 eggs and 6582 larvae were collected from plankton samples and 69 species belonging to 27 families were identified. The most abundant families included Sparidae 23.79%, Clupeidae 24.63%, Mullidae 12.22%, Serranidae 8.72% and Mugilidae 8.04% of total eggs, and Gobiidae 67.38%, Sparidae 9.43% and Blennidae 9.31% of total larvae. In this study, with regard to eggs, because some species preferred to release their eggs in clean water, stations in the outer bay showed similarities, while stations in the middle bay formed various groups amongst themselves. From the point of view of larvae, apart from station 2, which was near the lagoon area in the middle bay, the other stations were similar. The reason for this is the abundance of species of the Gobiidae family specific to that area. In areas with a low diversity index in respect of eggs, the presence of dominant species was detected. The highest diversity index and frequency of occurrence of fish eggs and larvae were determined in spring, the reason for this being that the spawning period of many fish species in Izmir Bay begins at the end of spring. In the middle and outer bay, where the stations in this study were situated, the pollution in Izmir Bay was found generally not to influence the species diversity of fish eggs and larvae.
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    An investigation of growth parameters and otolith-total length relationship of Solea solea (L., 1758) Pisces: Soleidae) in Ismir Bay
    (1999) Hoşsucu B.; Kaya M.; Taşkavak E.
    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 lengths were compared with each of them. Similarly, the same parameters were utilized to determine sexual differences. As a result, it was observed that age and length groups of wild-caught specimens agree with the age and length groups calculated theoretically. Each otolith length group conforming to total length groups was distributed homogeneously, whereas the differences between them were statistically significant.
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    Some parameters of the population biology of spotted flounder (Citharus linguatula Linnaeus, 1758) in Edremit Bay (North Aegean Sea)
    (2005) Türker Çakir D.; Bayhan B.; Hoşsucu B.; Ünlüoglu A.; Akalin S.
    A total of 1096 spotted flounder (Citharus linguatula Linnaeus, 1758) were caught in Edremit Bay from September 1998 to September 2000. Length-weight relationships, age, growth, mortality and sex ratio of the samples were investigated. Within the population of this species, most of the individuals in our samples ranged from 100 to 160 mm (69.63%), the minimum and maximum total lengths of the specimens being 69 and 222 mm, respectively. Positive allometric growth was observed for male, female and all fish. Age distribution of the samples was from I to IV. There was no significant difference between observed and calculated (von Bertalanffy and back calculation) average total lengths of the age groups (P > 0.05). The sex ratio (females:males) was 1:1.27. The total (Z), natural (M) and fishing mortality (F) rates, and the exploitation ratio (E) for all individuals were estimated respectively as Z = 0.60, M = 0.75, F = 0.15 and E = 0.25. This shows that the spotted flounder stock of Edremit Bay is being exploited at a lower than optimal level. © TÜBİTAK.