Reproductive parameters of common carp (Cyprinus carpio L) spawners during natural season and out-of-season spawning.
Common carp spawning characteristics were compared between season and out-of-season periods. There were no differences in the percentage of ovulation, spermatozoa motility and embryo survival to the eyed-egg-stage between the spawning periods. Fish spawned during the season produced oocytes of higher total weight than those spawned out-of-season. On the day exogenous feeding began, larvae obtained in out-of-season spawning were shorter than those obtained during the spawning season. However, the out-of-season larvae started feeding two days earlier than in-season larvae. As a result, seven days after fertilization, larvae obtained during out-of-season had the same length as larvae obtained during season. It appears to be possible to obtain common carp larvae half a year before the natural spawning period without decreasing the quality of gametes and larvae.
Kucharczyk
Dariusz
D
Department of Lake & River Fisheries, University of Warmia and Mazury in Olsztyn, 5 Oczapowskiego St., 10-718 Olsztyn-Kortowo, Poland. darekk@uwm.edu.pl
Targońska
Katarzyna
K
Hliwa
Piotr
P
Gomułka
Piotr
P
Kwiatkowski
Maciej
M
Krejszeff
Sławomir
S
Perkowski
Jacek
J
D000818:Animals; D002347:Carps / Q000196:embryology / Q000502:physiology*; D005260:Female; D007814:Larva / Q000254:growth & development; D008297:Male; D010060:Ovulation / Q000502:physiology; D012098:Reproduction / Q000502:physiology*; D012621:Seasons; D013081:Sperm Motility / Q000502:physiology