Effects of various stocking densities on hatching and survival rates of sea cucumber Holothuria tubulosa eggs (Gmelin, 1788)
Makaleler > Tam Makale · 2018
Yazarlar: Deniz GÜNAY, Mustafa Tolga TOLON, Dilek EMİROĞLU
Ege Journal of Fisheries and Aquatic Sciences, ESCI İndekslerine Giren Dergi, Uluslararası, Zoological Record, 2018, cilt 35, ss 381-386
DOI: 10.12714/egejfas.2018.35.4.03
Özet
In this study, it was aimed to determine the opening and survival rates of Holothuria tubulosa eggs at four different stocking densities (1,5,15,30 eggs / ml ) and to determine the effect of stocking density on egg size and larval size in different stages. Fertilized Holothuria tubulosa eggs were stocked in cylindrical conical collectors with a capacity of 30 l. Eggs were counted under light microscope at fertilization, early gastrulation, late gastrulation and hatching stages. It was found that there is an inverse relationship between stock intensity and opening rate (r = -0.848; p<0.001). The lowest hatching and survival rate was determined in 30 eggs / ml group (p <0.05). However, different stocking densities did not affect the diameter of the egg in different embryological stages (p> 0.05) and the length of early auricularia larva at 65 h (p> 0.05). As a result, the optimal stocking density for the highest hatching and survival rates of the fertilized eggs of Holothuria tubulosa was determined as 1-5 eggs / ml .