Distribution of anchovy eggs and larvae (Engraulis encrasicolus Cuv.) in the Black Sea in 1991-1992

Niermann, U.

doi:10.1006/jmsc.1994.1041

Cited by 69 publications

(49 citation statements)

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“…Until the mid-1970s, researchers considered the Black Sea to be a highly productive ecosystem at all trophic levels. Over the past 30 years, however, human manipulation of river outflows (Zaitsev, 1993), changes in nutrient loads (Bologa et al, 1984), the introduction of exotic species (Mutlu et al, 1994;Kideys and Romanova, 2001), excessive fishing (Gucu, 1997) and climatic variations (Oguz, 2005a) have meant drastic changes in the Black Sea ecosystem (Sorokin, 1983;Niermann et al, 1994;Oguz, 2005b of the total fodder zooplankton biomass in Black Sea coastal regions (Kovalev et al, 1998a). Copepod studies began 150 years ago with the identification of the species, but studies of Black Sea copepod reproduction have been limited.…”

Section: Introductionmentioning

confidence: 99%

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Üstün¹,

Bat²

2014

Turk. J. Fish. Aquat. Sci.

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The egg production rate (EPR) of Acartia (Acartiura) clausi was measured between January and December 2008 in Sinop Inner Harbor (southern Black Sea). During the study period, EPR were found to be generally low varying between 2.04±0.43 (20 October) and 19.41±1.73 eggs/female.day (26 March). The mean EPR was recorded 8.62±1.02 eggs/female.day. The results have shown that water temperature and chlorophyll-a concentration are factors that affect the EPR of A. clausi; however, these factors are not always sufficient alone to explain the EPR in Sinop Inner Harbor.

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Section: Introductionmentioning

confidence: 99%

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Üstün¹,

Bat²

2014

Turk. J. Fish. Aquat. Sci.

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“…Spawning occurs most efficiently from June to August in water temperatures higher than 20C, with optimal temperatures between 23-25C (Niermann et al, 1994;Lisovenko and Adrianov, 1996;Sorokin, 2002). Growth of Black Sea anchovy is characterized by its strong temperature dependence for the early-life stages (Lisovenko and Andrianov, 1996;Garcia and Palomera, 1996;North and Houde, 2004).…”

Section: Black Sea Anchovy Early Life Historymentioning

confidence: 99%

“…In spring, the migration routes reverse and anchovy move north again for spawning purposes. However, studies focusing on the southern Black Sea have repeatedly shown anchovy spawning in the entire southern Black Sea (Einarsson and Gürtürk, 1960;Niermann et al, 1994).…”

Section: Black Sea Anchovy Early Life Historymentioning

confidence: 99%

“…The mean sea surface height provided by Korotaev et al (2003) was then added to the daily AVISO fields to compute the geostrophic flow at the surface. Using only surface circulation fields in this study is a reasonable assumption for anchovy in the Black Sea, because eggs and larvae are found in the upper 10-20 m, above the seasonal thermocline, egg production not being possible in the Cold Intermediate Layer (~ 7°C) below the surface mixed layer (Niermann et al, 1994;Kideys et al, 1999;Satilmis et al, 2003).…”

Section: Satellite Datamentioning

confidence: 99%

“…For the purpose of this theoretical modeling study, anchovy eggs were assumed to be present in 11 coastal regions with depths less than 2000m (Figure 2, 1-11) that are generally accepted spawning areas throughout the Black Sea (Einarson and Gürtürk, 1960;Ivanov and Beverton, 1985;Niermann et al, 1994;Chashchin, 1996). Because observations show that anchovy eggs are found in open water areas of most of the Black Sea as well (Einarson and Gürtürk, 1960;Niermann et al, 1994), the open sea (>2000 m) was divided into another 4 areas (Figure 2, Area 12-15) to better identify the connectivity of spawning and overwintering grounds.…”

Section: Lagrangian Particle Trackingmentioning

confidence: 99%

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Fach¹

2014

Turk. J. Fish. Aquat. Sci.

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Dispersal mechanisms of Black Sea anchovy larvae (Engraulis encrasicolus ponticus) across the Black Sea were studied with an individual based anchovy larvae model embedded in a Lagrangian model using surface currents calculated from daily dynamic height topography maps of altimeter data during a period of three years (2001)(2002)(2003). Particles representing anchovy eggs were released at different sites during June to August and their movement was tracked over time. Drifters were advected for 36 days, representing the time it generally takes for anchovy eggs to develop into juveniles. Each individual was subject to somatic growth whose temperature dependence was calculated from satellite derived sea surface temperature data.Model results indicate that larval dispersal in the Black Sea is strongly controlled at the basin scale by the Rim Current circulation and its two cyclonic basin-wide gyres. It is locally controlled by mesoscale eddies. Consistent with the observed circulation fields, a strong meridional transport exists from the northern to the southern coastal zone along the western coast and the central basin. The peripheries of both the western and the eastern cyclonic gyres are also associated with strong larval transport from the southern coast to offshore areas. Elsewhere the connectivity between different regions is not as well pronounced due to weaker and patchy current fields. Variability in the dispersal of larvae is considerable when comparing different years and seasons and should be taken into account when designing networks of Marine Protected Areas in the Black Sea. Keywords: Black Sea anchovy larvae, Black Sea circulation, connectivity, Lagrangian modeling, temperature dependence. Karadeniz'deki Hamsi Dağılımı ve Bölgeler Arası Bağlantısı üzerine Hidrodinamik Proseslerin Etkisinin Modellenmesi ÖzetKaradeniz hamsi larvalarının (Engraulis encrasicolus ponticus) Karadeniz baseninde dağılım mekanizmaları, geliştirilen bir birey tabanlı hamsi larva modelinin üç yıllık (2001)(2002)(2003) altimetre verisinden hesaplanmış yüzey akıntıları kullanılarak bir Lagrangian modeline entegrasyonu ile araştırılmıştır. Model içinde hamsi yumurtalarını temsil eden parçacıklar HaziranAğustos ayları arasında farklı noktalarda bırakılmış ve zamana bağlı hareketleri takip edilmiştir. Hamsi yumurtalarının juvenil bireye gelişim süresi (ortalama) olan 36 gün boyunca model içinde bu parçacıklar akıntıya bağlı hareket etmiştir. Daha sonra bu bireylerin uydu verisinden hesaplanan yüzey suyu sıcaklık verisine bağlı olarak somatik büyümeleri hesaplanmıştır.Model sonuçları göstermiştir ki Karadeniz'de basen ölçeğinde larval dağılımı kontrol eden en büyük faktör kıyı akıntısı (Rim Current) ve iki büyük ölçekli siklonik döngüdür. Yerel ölçekte ise orta ölçek (mesoscale) girdaplar önem kazanır. Gözlemlenen akıntı sistemleri ile de tutarlı olarak, orta ve batı basende kuzey kıyılarından güneye güçlü bir boylamsal taşınım oluşur. Model sonuçları ayrıca batı ve doğu siklonik döngülerinin çevrelerinde güney sahillerinden ...

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Can Overfishing be Responsible for the Successful Establishment of Mnemiopsis leidyi in the Black Sea?

Gücü

2002

Estuarine, Coastal and Shelf Science

101

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Distribution of anchovy eggs and larvae (Engraulis encrasicolus Cuv.) in the Black Sea in 1991-1992

Cited by 69 publications

References 0 publications

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Can Overfishing be Responsible for the Successful Establishment of Mnemiopsis leidyi in the Black Sea?

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