Makeyeva et al, 1996


Makeyeva, A.P. and Belova, N.V. and Emel'yanova, N.G. and Verigin, B.V. and Ryabov, I.N. (1996) Materials on the state of reproductive system of bighead Aristichthys nobilis from the cooling pond of Chernobyl nuclear power station in the post-disaster period. Journal of Ichthyology, pp. 181-189

Associated characteristics

Species Development state Trait Primary Data Secondary Data
Aristichthys nobilis Egg Oocyte diameter Average 1.64 [Diameter of the ovulated oocytes] 1.64 mm
Aristichthys nobilis Egg Egg size after water-hardening 5.0-5.2 [Membrane after swelling] 5.1 mm
Aristichthys nobilis Female Oocyte development Low indexes of recorded maturation and of asynchronism in gamete development were characteristic of this species Asynchronous
Aristichthys nobilis Female Onset of oogenesis In autumn and early spring gonads were at III stage of maturation ['April', 'May', 'June', 'October', 'November', 'December']
Aristichthys nobilis Female Intensifying oogenesis activity At end of April and beginning of May, gonads reached the IV stage of maturation [Gsi about 7-13%] ['April', 'May']
Aristichthys nobilis Female Maximum GSI value In Fish from Moldova ponds maturation indexes comprised only 6-9%, on other coolers of Ukraine 10-12%. By our observations in ponds in Turmenistan and Uzbekistan this index comprises 11-13% 7.5 percent