The First Attempt to
Artificially Reproduce the Endangered Cyprinid Lake Minnow Eupallasella
Perenurus (Pallas)
R. Kamiński,
J. Kusznierz, L. Myszkowski, J. Wolnicki-2004
Aquaculture International, 12(1):
3-10
Abstract
:
The standard artificial reproduction technique with
the use of Ovopel (GnRH analogue) was evaluated for the critically
endangered cyprinid species in Poland, the lake minnow Eupallasella
perenurus. Wild spawners were angled at the beginning of the spawning
season. Only females with a condition coefficient value higher than the mean
were included in the experiment and then stimulated with Ovopel. Group A (n
= 20) was given standard treatment (0.2 pellet kg-1 and 1.0
pellet kg-1 after 12 h), whereas group B (n = 8) was
treated with a single dose of 2.0 pellets kg-1. After
fertilisation with the dry method, the glutinous eggs attached to the bottom
of flow-through aquaria were incubated at 17.1–18.4°C.
Throughout incubation (85D°), dead eggs were
removed and counted. The same was done with dead larvae, those with deformed
bodies or those with empty alimentary tracts after 2 days of external
feeding. Two injections of Ovopel resulted in a significantly (P ≤
0.05) higher ovulation rate in comparison with the single dose (70 and 25%
in groups A and B, respectively). The individual hatching rates were very
high (98.4–100%), as was the share of good
quality larvae (91.1 and 96.5% of stripped eggs in groups A and B,
respectively). These results indicate that the standard propagation method
used with commercially important cyprinid species can also be used to
successfully breed E. perenurus.
(Pond Fishery Department, The Stanisław
Sakowicz Inland Fisheries Institute in Olsztyn, Żabieniec,
05-500 Piaseczno, Poland, e-mail: erka@infish.com.pl)