Survival, growth and condition of tench Tinca tinca (L.)
larvae fed live food for 12, 18 or 24 h a day under controlled
conditions
J.
Wolnicki, R. Kamiňski, L. Myszkowski-2003
Journal of
Applied Ichthyology, 19(3):
146-148
Abstract:
The present 20-day trial was performed in
order to improve growth of tench Tinca tinca (L.) larvae reared
intensively in a controlled environment. Larvae of 4.53 mm initial
length, 45 per dm3, were fed each day with live Artemia nauplii
for 12, 18 or 24 h at 28°C. Final survival rates were very high in all
treatment groups, ranging from 88.9 to 91.8%. Duration of daily feeding
significantly affected growth and final condition, expressed by Fulton's
coefficient (K) (P
>/= 0.05,
Duncan's test). The fastest larval growth (17.6 mm total length, TL;
88.8 mg body weight, BW) and the best condition (K = 1.54)
were recorded in the group fed 24 h each day. The second best results
were attained with the larvae fed 18 h a day (16.5 mm TL, 67.9 mg
BW, K = 1.40) whereas those fed 12 h daily grew the slowest
(13.5 mm TL, 31.7 mg BW) and showed the worst condition (K = 1.19).
Thus, to maximize growth and condition of tench larvae being reared at the
optimal growth temperature, intensive 24 h feeding is necessary.
(The Stanislaw Sakowicz Inland Fisheries
Institute in Olsztyn, Pond Fishery Department, Žabieniec, PL-05-500
Piaseczno, Poland. E-mail: jawol@infish.com.pl