Survival, growth and condition of tench Tinca tinca (L.) larvae fed live food for 12, 18 or 24 h a day under controlled conditions

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 dm 3 , 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 ¼ 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 ¼ 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 ¼ 1.19). Thus, to maximize growth and condition of tench larvae being reared at the optimal growth temperature, intensive 24 h feeding is necessary.

Effect of live and dry food on rearing of tench (Tinca tincaL.) larvae under controlled conditions

“…Acceleration of the growth rate in finfish aquaculture is possible by modification of thermal conditions (Peňaz et al, 1989;Wolnicki and Korwin-Kossakowski, 1993), or feeding or stocking density (Quiros and Alvariño, 2000;Wolnicki et al, 2003;Celada et al, 2007a). The best growth rate of tench larvae (about 0.5 mm day -1 ITL) was obtained at 28°C with the use of live food for 12-13 h per day (Wolnicki and Korwin-Kossakowski, 1993;Wolnicki et al, 2003).…”

“…It concerns especially controlled reproduction , Kujawa et al 2010, sperm cryopreservation (Babiak et al, 1998;Cejko et al, 2010), gamete management , incubation conditions and initial rearing of larvae under controlled conditions (i.e. Kucharczyk et al, 1997;Kujawa et al, 2009;Wolnicki et al, 2003;Wolnicki et al, 2006;Mamcarz et al, 2006).…”

“…For that purpose, most commonly used techniques are: specially prepared and naturally fertilized ponds (Milstein et al, 2006;Śliwiński, 2009), net cages or recirculating aquaculture systems (i.e. Wolnicki et al, 2003;Wolnicki et al, 2006;Wolnicki et al, 2009). Fast developing cultures in closed systems are becoming increasingly widely used due to the possibility of full control of environmental and sanitary conditions (Blancheton, 2000) and economic effectiveness of production (Turkowski et al 2008).…”

“…In addition, researches have been undertaken on rearing tench larvae under controlled conditions (Quiros and Alvariño, 2000;Wolnicki et al, 2003). Initially, lack of suitable food for very small young larvae was a serious problem in the early rearing of fish larvae.…”

“…Initially, lack of suitable food for very small young larvae was a serious problem in the early rearing of fish larvae. Advances in using Artemia as the first live foods for the larvae (Fleig et al, 2001;Wolnicki et al, 2003, Celada et al, 2007b as well as improved new types of artificial, commercially available fish feeds make it possible to overcome this obstacle (Wolnicki and Górny, 1995;Wolnicki and Myszkowski, 1998;Quiros et al, 2003;Wolnicki et al, 2006).…”