Nb. Cherfas et al., INDUCED GYNOGENESIS AND POLYPLOIDY IN THE ISRAELI COMMON CARP LINE DOR-70, Israeli journal of aquaculture-Bamidgeh, 45(2), 1993, pp. 59-72
Meiotic and mitotic diploid gynogenetic, triploid and tetraploid proge
nies were obtained in the Israeli common carp (Cyprinus carpio L.) lin
e Dor-70 in laboratory experiments and in large scale production in We
iss incubation jars. Chromosome-set diploidization was induced by heat
shock applied at the second meiotic division or at the first cleavage
. A high rate of response to induction of diploid gynogenesis was obse
rved. The best production was 29% meiotic gynogenetic larvae and 23% m
itotic gynogenetic larvae (of fertilized eggs). About 10,000 meiotic g
ynogenetic larvae and 40,000 mitotic gynogenetic larvae were obtained
from mass production experiments. Survival of gynogenetic progenies to
age 2.5 months under pond conditions was 8% for meiotic gynogens and
3% for mitotic gynogens. A large number of mitotic gynogenetic fingerl
ings had morphological aberrations. The frequency of triploid larvae w
as 83-100% and that of tetraploid larvae 92-100%, in the most successf
ul experiments, but heat shock resulted in markedly decreased larvae s
urvival. Many tetraploid larvae were weak and/or deformed, and only tw
o tetraploids were found (among 31 surviving fish) after two months re
aring in ponds.