Yazar "Gaygusuz, Özcan" için listeleme
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Conversions of total, fork and standard length measurements based on 42 marine and freshwater fish species (from Turkish water)
Gaygusuz, Özcan; Gürsoy Gaygusuz, Çiğdem; Özuluğ, Müfit; Tarkan, Ali Serhan; Acıpınar, Hasan; Bilge, Gökçen; Filiz, Halit (2006)Relationships between total (TL), fork (FL) and standard (SL) lengths belonging 19 families from Aegean and Marmara coast of Turkey were presented for 42 fish species. The relationships between TL, FL and SL were all linear ... -
The Diel Changes in Feeding Activity, Microhabitat Preferences and Abundance of Two Freshwater Fish Species in Small Temperate Streams (Omerli, Istanbul)
Gürsoy Gaygusuz, Çiğdem; Tarkan, Ali Serhan; Gaygusuz, Özcan (Foundation Environmental Protection & Research-Fepr, 2010)We examined the abundance, food and microhabitat use of Proterorhinus marmoratus (Gobiidae) and Cobitis vardarensis (Cobitidae) during both day and night in two small temperate streams of the Black Sea region (North-West ... -
Diurnal vertical distribution of zooplankton in a newly formed reservoir (Tahtalı Reservoir, Kocaeli): the role of abiotic factors and chlorophyll a
Although water level fluctuations and related environmental variations occurring within reservoirs have a considerable effect on the zooplankton community, studies on zooplankton dynamics of reservoirs are very limited. ... -
The ichthyofaunal diversity of freshwater ecosystems in Gökçeada island (NW Turkey) under the pressure of nonnative species
Ağdamar, Sevan; Saç, Gülşah; Gaygusuz, Özcan; Doğaç, Ersin; Acar, Ümit; Gürsoy Gaygusuz, Çiğdem; Özuluğ, Müfit (Turkiye Klinikleri, 2021)Freshwater ecosystems have a greater value for biodiversity per surface area than terrestrial and marine ecosystems. Streams and lakes are notably prone to biodiversity loss, being the greatest threats habitat destructions ... -
Interannual variability of fecundity and egg size of an invasive cyprinid, Carassius gibelio: Effects of density-dependent and density-independent factors
Tarkan, Ahmet Nuri; Gaygusuz, Özcan; Tarkan, Ali Serhan; Gürsoy, Çiğdem; Acipinar, Hasan (Taylor & Francis Inc, 2007)A population of the invasive Prussian carp (Carassius gibelio) was examined over a three-year period in a mesotrophic reservoir to find out interannual variations of fecundity and egg size and the influence of maternal ... -
Length-weight relationships of six freshwater fishes from small streams flowing into Lake Sapanca, NW Turkey
Tarkan, Ali Serhan; Özuluğ, Müfit; Gaygusuz, Özcan; Gaygusuz, C. G.; Saç, Gülşah (Wiley, 2009)Length-weight relationships are given on six freshwater fish species (Phoxinus phoxinus, Cobitis vardarensis, Neogobius gymnotrachelus, Proterorhinus marmoratus, Petroleuciscus borysthenicus and Gambusia holbrooki) from ... -
A new locality for the freshwater fis Chondrostoma angorense Elvira, 1987 (Osteichtyes: Cyprinidae) in the Marmara Region (Turkey)
Marmara Bölgesi’nde (Türkiye) tatlısu balığı Chondrostoma angorense Elvira, 1987 (Osteichtyes: Cyprinidae) için yeni bir lokalite. Sakarya Nehri havzasından ilk Chondrostoma türü C. nasus olarak 1987 yılında rapor edildi. ... -
Ötrofik bir rezervuarda (Tahtalı, Kuzeybatı Türkiye) fizikokimyasal faktörler ve klorofil a’nın zooplanktonun günlük dikey dağılımına etkisi
Son yıllarda dünya çapında artış göstermesine rağmen, sulama amacıyla yapılan su kütlelerinde zooplankton komünitesinin bölgesel ve zamana bağlı değişimleri çok az ilgi görmüştür. Bu çalışmanın amacı, ötrofik bir rezervuarın ... -
REOCCURRENCE OF A COMMERCIAL EURYHALINE FISH SPECIES, Atherina boyeri Risso, 1810 (Atherinidae) IN BÜYÜKÇEKMECE RESERVOIR (ISTANBUL, TURKEY)
Saç, Gülşah; Gaygusuz, Özcan; Tarkan, Ali Serhan (2015)The big-scale sand smelt, Atherina boyeri Risso, 1810 was recorded for the first time from Bü yü kç ekmece Reservoir (İstanbul, Turkey) in 1982. However, recent studies on the fish fauna of Bü yü ... -
A review and meta-analysis of growth and life-history traits of a declining European freshwater fish, crucian carp Carassius carassius
Tarkan, Ali Serhan; Almeida, David; Godard, Michael J.; Gaygusuz, Özcan; Rylands, Mark; Sayer, Carl D.; Copp, Gordon H. (Wiley-Blackwell, 2016)1. In response to reported declines in crucian carp Carassius carassius across Europe, studies of the status and population biology of the species in England led to Biodiversity Action Plan priority designation in the ... -
Stocking of Common Carp (Cyprinus carpio) into Some Newly-Established Reservoirs of North-West Anatolia May Enhance the Spread of Non-Native Fish
Gaygusuz, Özcan; Tarkan, Ali Serhan; Aydın, Hamdi; Dorak, Zeynep; Top, Nildeniz; Karakuş, Uğur; Vilizzi, Lorenzo (Central Fisheries Research Inst, 2015)Stocking of water bodies with non-native fish species for fisheries enhancement is a common practice worldwide. However, overall limited benefits in terms of revenues for local communities have so far been reported in some ...
