<abstract xmlns="http://www.w3.org/1999/xhtml">Sagittae otoliths of eight juvenile species: <italic>Boops boops</italic>, <italic>Diplodus vulgaris</italic>, <italic>Diplodus puntazzo</italic>, <italic>Sarpa salpa</italic> (family Sparidae), <italic>Liza ramada</italic>, <italic>Liza aurata</italic> (family Mugilidae), <italic>Atherina boyeri</italic>, <italic>Atherina hepsetus</italic> (family Atherinidae) were analysed and compared using descriptive morphological characters and morphometric indices. The noticeable differences among the otoliths of the investigated species are in their overall shape, margins (i.e. irregular, sinuate or crenate) and anterior region. Otolith shape varied from elliptic to pentagonal in sparids, elliptic to rectangular in mugilids and elliptic in two atherinids. Aspect ratio (OW/OL), ratio of the sulcus length occupied by the cauda length (CL/SL) and ratio of the sulcus length occupied by the ostium length (OSL/SL) were calculated for all species. The otolith contour was described using wavelets. The Canonical Analysis of Principal Coordinates (CAP) gave an overview of the otolith shape differentiation between eight juveniles. Using the Wavelet coefficients, the first principal component (CAP1) explained 58.1% of the variation among species and the second principal component (CAP2) 25.2%.</abstract>

Variability of Otolith Morphology and Morphometry in Eight Juvenile Fish Species in the Coastal Eastern Adriatic

<abstract xmlns="http://www.w3.org/1999/xhtml">Algae are gaining attention for their application in aquaculture as a highly sustainable source of useful products. As microalgae have a significant role in primary production in aquatic ecosystems and are the basis of many food chains, it is important to understand the processes that provide them with better survival in a toxicant-polluted environment. In this study the <italic>Chlorella</italic> bioassay was evaluated: (1) as a potential method for algae farming, (2) as a method for testing advantages or disadvantages of symbiotic association, including two species of aposymbiotic algae, i.e. endosymbiotic algae isolated from green hydra <italic>Mychonastes homosphaera</italic> (Skuja) Kalina and Punčochářová and <italic>Desmodesmus subspicatus</italic> (Chodat) Hegewald and Schmidt) and two related free-living algal species (<italic>Chlorella kessleri</italic> Fott and Novak. [K&amp;H, 1992] and <italic>C. vulgaris</italic> Beij. [K&amp;H, 1992]), (3) through algal bioindicator responses related to comparative toxicity and ecotoxicological pollution of iron, and (4) by using algal bioindicators for microscopical and morphometrical application in environmental stress. Increasing concentrations of iron led to cell changes (dry dotted clusters of dying cells, intensive green wet bubbles representing a mucous structure, area, diameter and length), deformations (empty cells, aberrant divisions, irregular coenobia, tetrads and transitional forms) and ultrastructural changes (chloroplasts and nuclei). All modifications were more pronounced in aposymbiotic algae, suggesting a lower degree of adaptation to iron toxicity than their free-living relatives. A free-living species <italic>C. kessleri</italic> showed the best ability to survive in given unfavorable environmental conditions. High statistical significance was noticed in the cell division parameter, underlining the hormetic effect of increasing the biomass in free-living algal species. This increasing of the cell divisions at the specific concentration of iron demonstrated that the <italic>Chlorella</italic> bioassay may represent a useful tool for evaluating the growth of different microalgal species, and has a prospective application in a comparative study of algae farming.</abstract>

Evaluation of Algae Farming Using the <italic>Chlorella</italic> Bioassay

<abstract xmlns="http://www.w3.org/1999/xhtml"><italic>Chelon caeruleum</italic> sp. nov. is described as a new species of <italic>Chelon</italic> encountered in the Rashid coastal region of the Mediterranean Sea, Egypt. With this finding, the new species is the sixth member of the genus <italic>Chelon. Chelon caeruleum</italic> sp. nov. is distinguished from its congeners by the following characters: colouration of body is dark bluish grey dorsally and the sides are blue; head length 20.5 to 21.6% SL; head width 13 to 13.5% SL; pre-first dorsal fin length 50% SL; eye diameter 4.6 to 5.2% SL; postorbital length 10.7 to 11.1% SL; unbranched pyloric caeca are 2 short and 4 long; a pair of long (one longer than the other), spine-like neural postzygapophyse on the second vertebra. DNA of <italic>Chelon caeruleum</italic> sp. nov. and five mullet species (<italic>Mugil cephalus, Liza carinata, Liza ramada</italic>, <italic>Liza aurata,</italic> and <italic>Chelon labrosus</italic>) was extracted then amplified using polymerase chain reaction (PCR) and sequenced. The mtDNA cytochrome oxidase subunit I sequence analysis confirmed that <italic>Chelon caeruleum</italic> sp. nov. is distinct from other congeners of <italic>Chelon</italic> and it is a different species of <italic>Chelon</italic> which is new to science.</abstract>

A New Species of Mullet <italic>Chelon caeruleum (</italic>Family: Mugilidae) with Description of its Genetic Relationship to Some Mugilids

<abstract xmlns="http://www.w3.org/1999/xhtml">The purpose of the present study is to extend knowledge on the adverse effects of nanoparticles by evaluating genotoxicity as environmental risk assessment in <italic>Oreochromis mossambicus</italic>. Fish were exposed to sublethal concentrations of the selected nanoparticles, namely silicon dioxide (SiO2NPs-12mg/L), aluminium oxide (Al2O3NPs-4mg/L), titanium dioxide (TiO2NPs-16.4mg/L) and iron oxide (Fe3O4NPs-15mg/L) for short-term (24, 72 and 96 h) and long-term durations (15, 30 and 60 days). Genetic damages such as cytoplasmic, nuclear and DNA damage were measured in the erythrocytes of fish by using standard genotoxicity tests such as micronucleus test and comet assay. The frequencies of micronuclei along with nuclear and cytoplasmic abnormalities were scored and compared with the control group. The intensity of micronuclei along with other nuclear and cytoplasmic anomalies are found to be increased significantly (p&lt;0.05) in time-dependent manner in all exposure groups when compared to the control group, thereby indicating chromosomal damage as a result of contact with nanoparticles. The tail length and percent of tail DNA within the comet significantly (p&lt;0.05) increased in time-dependant manner after exposure to all nanoparticles, demonstrating an increase in DNA damage. Taken together, by using micronucleus test and comet assay, it is evident that the selected nanoparticles at sublethal concentrations induced genetic damage in <italic>Oreochromis mossambicus</italic>.</abstract>

Evaluation of Genetic Damage in <italic>Oreochromis mossambicus</italic> Exposed to Selected Nanoparticles by Using Micronucleus and Comet Bioassays

<abstract xmlns="http://www.w3.org/1999/xhtml">The paper presents a review of the distribution of marine crabs (Brachyura) along the Turkish coast and the amount of economically important marine crabs harvested between 1967 and 2016. Previous records reported that Turkey had 102 brachyuran crab species, only five of them being economically important, but this review identifies two more species, <italic>Inachus phalangium</italic> and <italic>Ashtoret lunaris</italic>. The Aegean Sea has more crab species than the Mediterranean, the Black Sea and the Sea of Marmara. The most harvested species are <italic>Callinectes sapidus</italic>, <italic>Maja squinado</italic>, <italic>Eriphia verrucosa</italic>, <italic>Carcinus aestuarii</italic> and <italic>Portunus segnis</italic>, respectively. This review shows that there have been fluctuations in the harvest of marine crabs between years, the lowest being 5 tonnes in 2015 and the highest, 2116 tonnes in 1984. The information provided in this review provides a basis for potential profitable development of conservation and management strategies of marine crabs in Turkey.</abstract>

Faculty of Marine Sciences and Technology

A Review of the Marine Crab Fisheries in the Turkish Seas

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Croatian Journal of Fisheries

Volume 76 (2018): Issue 3 (September 2018)

Variability of Otolith Morphology and Morphometry in Eight Juvenile Fish Species in the Coastal Eastern Adriatic

Evaluation of Algae Farming Using the Chlorella Bioassay

A New Species of Mullet Chelon caeruleum (Family: Mugilidae) with Description of its Genetic Relationship to Some Mugilids

Evaluation of Genetic Damage in Oreochromis mossambicus Exposed to Selected Nanoparticles by Using Micronucleus and Comet Bioassays

A Review of the Marine Crab Fisheries in the Turkish Seas

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