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Název:		Pikeperch (Sander lucioperca L.) larviculture improvements using rotifers Brachionus plicatilis = Inovace chovu larev candáta obecného (Sander lucioperca L.) při použití vířníků druhu Brachionus plicatilis
Autor:		Aiman Imentai
Rok vydání:
Identifikátory:		9788075141156 cnb003255240

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Anotace:	"Pikeperch Sander lucioperca L. is a promising candidate for intensive aquaculture. Currently, a critical bottleneck in pikeperch larviculture is the period of initial exogenous feeding when high mortalities occur. Since recognition of the rotifer as potential feed for larva culture, its use has grown tremendously in fish hatcheries. Although use of rotifers and Artemia as a starter feed has become a common practice in hatcheries, rotifers have not been used for pikeperch larval culture. Questions regarding introduction of rotifers as pikeperch larva first exogenous feeding remain unanswered. The aim of the research contained in this thesis was to maximize survival, growth, and proper development of pikeperch larvae during first exogenous feeding using rotifers Brachionus plicatilis. The effects of B. plicatilis on survival rate, growth performance, stomach fullness, fatty acid composition of pikeperch larvae during first feeding were evaluated in Chapter 2 (Yanes-Roca et al., 2018). Larvae were reared under three diets (Artemia; Artemia/rotifer; rotifer) from 3 to 17 days post-hatching (DPH). Using rotifers as first diet for pikeperch larvae was shown to benefit survival and growth rates. Larvae fed on rotifers only or combined with Artemia obtained higher survival and growth compared to feeding on Artemia alone. The essential fatty acid content and smaller size of rotifers had a considerable effect on larval survival and growth, confirming that the mixed Artemia/rotifer diet can be recommended for initial exogenous feeding in pikeperch larvae. The objective in Chapter 3 (Imentai et al., 2020) was to optimize the first exogenous feeding regime for pikeperch larvae using rotifers and Artemia. Larvae were provided with B. plicatilis for 3 days followed by one of five diet regimes from 8 to 17 DPH: rotifers only; 8–13 DPH rotifers/14–17 DPH Artemia; 8–10 DPH rotifers/11–17 DPH Artemia; Artemia only; and a rotifer/Artemia combination. Feeding on rotifers from 5 to 8 DPH followed by Artemia or rotifer/Artemia to 17 DPH can ensure high survival and growth rates, and optimal development of digestive organs. Feeding larvae with rotifers from 5 to 8 DPH followed by Artemia alone to 17 DPH is recommended as an optimum feeding regime, larval survival and growth are satisfactory, and production costs are lower. The main aim in Chapter 4 (Imentai et al., 2019a) was to determine the optimal salinity for rearing of pikeperch larvae while feeding B. plicatilis. Rotifers were stocked at 0‰, 2‰, 4‰, 8‰, 16‰ salinity, and motility was investigated over a 6-h period. The same salinities were used in second trial to quantify the effect on pikeperch gut fullness over the course of 11 h. In a third trial, the survival and growth rate of larvae from 4 to 11 DPH at low and medium salinity were analysed. Results of this study showed that rotifers stocked at all tested salinities, except for freshwater, retained motility for over a 6-h period. Pikeperch larvae reared at 2‰ and 4 ‰ showed higher survival and growth rate compared to freshwater. The results of this study showed advantages of rearing larvae in low salinity water during initial exogenous feeding with B. plicatilis. The aim in Chapter 5 (Imentai et al., 2019b) was to determine the optimal rotifer density as pikeperch larvae prey at the beginning of exogenous feeding. Larvae were divided into four groups provided rotifers at 2, 6, 10, and 20 ind/mL from 5 to 9 DPH. The optimal growth performance was achieved at 20 ind/mL, however survival rate did not significantly differ among groups. Results suggested that B. plicatilis at density of 6 ind/mL can be recommended for larval feeding from 5 to 9 DPH when balanced with production costs." In IMENTAI, Aiman. Pikeperch (Sander lucioperca L.) larviculture improvements using rotifers Brachionus plicatilis =: Inovace chovu larev candáta obecného (Sander lucioperca L.) při použití vířníků druhu Brachionus plicatilis. Vodňany: Faculty of Fisheries and Protection of Waters, University of South Bohemia in České Budějovice, 2020. 85 stran. ISBN 978-80-7514-115-6.
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