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Kotor, Montenegro

Redzic A.,Institute for Marine Biology | Krstulovic N.,Croatian Institute Of Oceanography And Fisheries | Solic M.,Croatian Institute Of Oceanography And Fisheries | Santic D.,Croatian Institute Of Oceanography And Fisheries | Ordulj M.,University of Split
Acta Adriatica

The dynamics of the prokaryotic picoplankton community were studied at six stations of three embayments in Boka Kotorska Bay from January 2010 to January 2011. The abundance of non-pigmented bacteria, high nucleic acid content (HNA) bacteria, low nucleic acid content (LNA) bacteria, bacterial production and heterotrophic nanoflagellates was determined, as well as the chlorophyll a, physical and chemical factors of the water column. It seems that freshwater input has the ability to control bacterial abundance as well as the proportion of HNA cells in bacterial community and thus the abundance of HNF cells. During the warmer seasons, in the investigated area, which is mainly oligotrophic, we found an increase in values and domination of the LNA group in the bacterial population. The dominance of the HNA group was found only during the colder seasons. Weak coupling between bacteria and HNF suggests that predation (top down control) is not dominant in controling of bacterial abundance in studied area. © 2015, Institute of Oceanography and Fisheries. All rights reserved. Source

PesIC A.,Institute for Marine Biology | Durovic M.,Institute for Marine Biology | Joksimovic A.,Institute for Marine Biology | Regner S.,Serbian Institute for Multidisciplinary Research | And 2 more authors.
Acta Adriatica

The annual alteration of gonad morphology in sardine (Sardina pilchardus, Walbaum 1792) caught in the period from November 2006 to October 2007 using beach seines in the region of Boka Kotorska Bay (Montenegro, southern Adriatic) was studied. Samples were taken in the middle of each month. Total length of individuals ranged from 8.7 to 14.7 cm and weight ranged from 4.67 to 22.61 g. Their gonads were extracted and weighed, and a piece of gonad tissue was sampled for histological analysis. The length-weight relationship of all sardine specimens was described by the equation: W=0.0059 L T 3.0891; (r 2 = 0.963). The lowest gonadosomatic index (GSI) values, below 1, were found in June, July and August, corresponding to the state of gonad rest. The GSI increased gradually from September and October and reached its highest value in February, at 5.22 for females and 6.58 for males. After February the GSI started to decrease throughout March (4.5), April (2.4) and May (2.4). In June all gonads had a GSI bellow 1. Although primary oocytes (stage I) were present during all months, their percentage increased from May and was the highest during the summer months (June-September 100%). Mature stage IV oocytes were recorded from November to April, with the highest percentage recorded during January (26.7%). An increase in the percentage of oocytes in the yolk vesicle (II) and yolk (III) stages occurred in October, remaining almost unchanged until May. During the summer months (May - September), only stage I spermatogonia were present in the testicles. In October, spermatocytes (stage II) started to appear, while from November the spermatids (stage III) appeared as well. Spermatozoa (stage IV) appeared in December and reached their maximum level in January and February. Source

Durovic M.,Institute for Marine Biology | Pesic A.,Institute for Marine Biology | Regner S.,Serbian Institute for Multidisciplinary Research | Joksimovic A.,Institute for Marine Biology | And 4 more authors.
Acta Adriatica

Daily growth rate of juvenile anchovy, Engraulis encrasicolus (Linnaeus, 1758), was estimated in the south-eastern Adriatic Sea. Samples were taken by a commercial beach seine net and the size range of 100 sampled individuals was 5.0-6.8 cm total length. Age was estimated by counting growth increments of sagittal otoliths, which are formed with daily periodicity. Estimated ages were 41- 90 days and hatch date for each age class was back-calculated from the date of capture. The calculated instantaneous growth rate was 0.41 mm day-1. Fish size at metamorphosis from late larva to juvenile was estimated to 3.2 cm total length. Parameters of the von Bertalanffy's growth function were L∞ = 10.41 and K = 3.36. Source

Tomovic J.,University of Belgrade | Zoric K.,University of Belgrade | Simic V.,University of Kragujevac | Kostic M.,Institute for Marine Biology | And 3 more authors.
Archives of Biological Sciences

Sinanodonta woodiana (Lea, 1834), Chinese pond mussel (Bivalvia: Unionoida: Unionidae) is one of the most invasive aquatic macroinvertebrate species found in Europe. We report the Chinese pond mussel for the first time in Montenegro, in August 2012, in Lake Šasko (Adriatic part of the Central Mediterranean subarea). One specimen of the Chinese pond mussel was observed in a habitat with a predominantly silt-clay substrate. The main pathway of species introduction was evaluated to be via fish stocking. Source

Dulcic J.,Croatian Institute Of Oceanography And Fisheries | Dragicevic B.,Croatian Institute Of Oceanography And Fisheries | Pavicic M.,Croatian Institute Of Oceanography And Fisheries | Ikica Z.,Institute for Marine Biology | And 2 more authors.
Annales, Series Historia Naturalis

Authors report additional records of five fish species (Caranx crysos, Fistularia commersonii, Ruvettus pretiosus, Tylosurus acus imperialis, Zu cristatus) that are considered non-indigenous, rare and less known species in the Adriatic Sea. C. crysos and F. commersonii can be considered as established species in the Adriatic Sea. © 2014, University of Primorska. All rights reserved. Source

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