Gücü, Ali Cemal
Kıdeyş, Ahmet Erkan
Two international surveys of anchovy eggs and larvae were carried out in the Black Sea at the beginning of the spawning season in June 1991 and during the main spawning period in July 1992. Horizontal tows demonstrated that the bulk of anchovy eggs acid larvae were distributed in the upper 3-m layer, but in downwelling areas eggs and larvae were found down to 70 m depth. In contrast to earlier studies, vertical hauls obtained during the present investigation contained higher egg numbers in the southern and particularly south-eastern Black Sea than in the north-western region, which is known as the main spawning area of anchovy. Long-term sampling by the Institute of Biology of the Southern Seas, Sevastopol, shows that, in the northern Black Sea, the number of anchovy eggs and larvae found since the mid-1980s is lower than in the early 1960s. The sudden decline of anchovy ichthyoplankton in 1989, coinciding with the outburst of the recently introduced Mnemiopsis sp. (Ctenophora), supports the hypothesis that this gelatinous zooplankton species has played a role in diminishing the Black Sea anchovy fisheries, although the drastic changes in the Black Sea ecosystem (due to pollution, eutrophication, and heavy fishing) have also had an effect.


Seasonal distribution of fish eggs and larvae off sinop (the southern Black Sea) in 1999-2000
Satilmis, HH; Gordina, AD; Bat, L; Bircan, R; Culha, M; Akbulut, M; Kıdeyş, Ahmet Erkan (2003-05-01)
The seasonal distribution of fish eggs and larvae off Sinop, the central southern Black Sea, was studied by using vertical and horizontal tows at two stations at biweekly intervals between January 1999 and November 2000. Besides basic oceanographic parameters, macro gelatinous was also sampled to evaluate their relation to fish eggs and larvae. Eggs or larvae of a total 23 fish species were present in the samples. Most of the species were found to occur during spring and summer. It is observed that especial...
Distribution of phytoplankton in the southern Black Sea in summer 1996, spring and autumn 1998
Eker-Develi, E; Kıdeyş, Ahmet Erkan (2003-03-01)
The species composition, abundance, and biomass of micro- (>15 mum) and nano- (<15 mu m) phytoplankton were studied along the southern Black Sea during June-July 1996 and March-April and September 1998. A total of 150 species were identified, similar to 50% of them being dinoflagellates. The average total phytoplankton abundance changed from 77 x 10(3) Cells l(-1) in spring to 110 x 10(3) cells l(-1) in autumn and biomass from 250 mu g l(-1) in summer to 1370 mu g l(-1) in spring. Based on the extensive sam...
Recent changes in the spawning grounds of Black Sea anchovy, Engraulis encrasicolus
Gücü, Ali Cemal; Ok, Meltem; Sakinan, Serdar (2016-01-01)
Towards the end of the 1980s, when the spawning grounds in the northwestern shelf (NWS) of the Black Sea were lingering with the effects of eutrophication and of an exotic invasive ctenophore, a series of basin-wide international ichthyoplankton surveys pointed out an increase in the anchovies spawning in the southern half of the Black Sea. Later, with the help of international conservation efforts, several key littoral ecosystem components within the anchovy's historical spawning grounds showed signs of re...
Study of Copepod Species from the Western Black Seain the Cruise r/v Knorr during May June 2001
Selifonova, Janet P; Shmeleva, Alexandra A; Kıdeyş, Ahmet Erkan (Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences, 2008-01-01)
Results of investigation of copepod fauna in the western Black Sea are obtained in May-June 2001. 49 taxa have been found including 33 taxa that are not of the Black Sea origin. The problem of intensifi cation of process of copepod fauna Mediterranization in the Black Sea basin is discussed.
Regional peculiarities of community-wide trophic cascades in strongly degraded Black Sea food web
Oguz, Temel; Salihoğlu, Barış; Moncheva, Snejana; Abaza, Valeria (2012-04-01)
The community-wide trophic cascade due to collapsed fish stocks and population outburst of invasive predators after the early 1990s resulted in different pelagic and benthic food web structures in the Black Sea. The northeastern region assumed their most simplified forms characterized by increasing mesozooplankton and polychaete biomass. The ecological degradation is more severe in the northwestern part, whereas the southern basin maintains an anchovy fishery under relatively weak gelatinous predation.
Citation Formats
U. NIERMANN et al., “DISTRIBUTION OF ANCHOVY EGGS AND LARVAE (ENGRAULIS-ENCRASICOLUS CUV) IN THE BLACK-SEA IN 1991-1992,” ICES JOURNAL OF MARINE SCIENCE, pp. 395–406, 1994, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30856.