A study on zooplankton of a grass carp nursing pond

Bu çalışma, alanı 0,61 ha ve derinliği 1 m olan bir toprak havuzda yürütülmüştür. Havuza 5 günlük ot sazanı larvaları 100000 adet/ha stoklanmıştır. Zooplankton örnekleri Temmuzdan Ağustosa kadar haftalık olarak alınmıştır. Zooplankton topluluğunda 7. ve 8. haftalar dışında çeşitli rotifer türleri dominanttır ve ortalama bolluk oranı % 74 olmuştur. Küçük Cladocera'lar 7. ve 8. haftalarda dominant olmuşlardır. Cladocera'nın ortalama bolluk oranı %24'dür. Bu çalışmada Cladocera'lar Bosmina longirostris, Daphnia hyalina, D. pulex, Diaphanosoma sp. ve Alona sp. gibi küçük Cladocera'larla temsil edilmişlerdir. Daphnia longispina ve D. magna gibi büyük olanlarına nadiren rastlanmıştır.Büyütme havuzlarında planktonik Crustacea populasyonu, Calanoid ve Cyclopoid türlerin nauplii ve kopepoditlerinden meydana gelmiştir. Copepod bolluğu oranı %2 olmuştur. Çalışma süresince zooplankton topluluğu içinde en yüksek biyomas Cladocera'ya ait olmuştur.

Ot sazanı yavru havuzunun zooplanktonu üzerine bir çalışma

This study was conducted in an earthen pond having an area of 0.61 ha and a deptth of 1 meter. Five day-old grass carp were stocked at arate of 100000/ha in pond. Zooplankton samples were taken every week from July to September. Zooplankton community was dominated by various rotifer species apart from the week 7 and 8; the mean abundance ratio was 74%. It changed to small cladocerans 7th and 8th weeks. The mean abundance ratio for Cladocera was 24%. Cladocera was represented by small cladocerans such as Bosmina longirostris, Daphnia hyalina, D. pulex, Diaphanosoma sp. and Alona sp. large cladocerans D.longispina ve D. magna were rarely found. Planktonic crustacean population in this nursing pond consisted primarily of Calanoid and CYClopoid species nauplii and copepodits. The ratio of Copepoda abundance was 2%. During the study the biomass of Cladocera was the highest in the zooplankton community.

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