Effects of enriched Artemia with Phospholipid on growth, survival, of the Persian sturgeon larvae (Acipenser persicus)

Effects of enriched Artemia with Phospholipid on growth, survival, of the Persian sturgeon larvae (Acipenser persicus)

It has been known for almost 25 years now that inclusion of intact phospholipids in the diet could improve culture performance of various freshwater and marine fish species. The primary beneficial effect was improved growth in both larvae and early juveniles, but also increased survival rates and decreased incidence of malformation in larvae, and perhaps increased stress resistance. Determination of absolute dietary requirements has been hampered by the use, in different dietary trials, of a wide range of phospholipid preparations that can vary greatly both in phospholipid content and class composition. Larval studies have been compromised further by the need on many occasions to supply phospholipid through enrichment of live feeds with subsequent re-modeling of the phospholipid and fatty acid compositions. Lecithin is known to be a consistent source of highly bioavailable phospholipids to crustaceans and fish. But there are a number of other nutritional benefits in aquaculture applications. This study investigated the effects of different Artemia enrichments containing different levels of variable amounts of the growth and survival of larval Persian sturgeon (Acipenser persicus). The fish with initial wet weight 40 mg were randomly distributed over 15 tanks of 300 L, representing five experimental treatments with three replicates per treatment. In the first stage, 200000 nauplii per liter of 26 ppt water were enriched with soya lecithin (74.42% phospholipid) for 12 hours. The enrichment emulsion was prepared by adding lecithin at the concentration of 0, 0.15, 0.3, 0.45 and 0.6 g ml-1. The newly hatched nauplii were collected for 12 hours, washed and fed to the fish larvae six times daily (at 8:00, 10:00,12,14, 16:00, 20:00) for a period of 15 days, followed by un-enriched nauplii and commercial until day 25 of growth. The results showed no significant differences in growth performance (BW and SGR) and also in survival of sturgeon larvae fed enriched and non-enriched nauplii (P 0.05). It is concluded that use of soybean lecithin enriched nauplii does not improve the growth and survival of the Persian sturgeon larvae.

It has been known for almost 25 years now that inclusion of intact phospholipids in the diet could improve culture performance of various freshwater and marine fish species. The primary beneficial effect was improved growth in both larvae and early juveniles, but also increased survival rates and decreased incidence of malformation in larvae, and perhaps increased stress resistance. Determination of absolute dietary requirements has been hampered by the use, in different dietary trials, of a wide range of phospholipid preparations that can vary greatly both in phospholipid content and class composition. Larval studies have been compromised further by the need on many occasions to supply phospholipid through enrichment of live feeds with subsequent re-modeling of the phospholipid and fatty acid compositions. Lecithin is known to be a consistent source of highly bioavailable phospholipids to crustaceans and fish. But there are a number of other nutritional benefits in aquaculture applications. This study investigated the effects of different Artemia enrichments containing different levels of variable amounts of the growth and survival of larval Persian sturgeon (Acipenser persicus). The fish with initial wet weight 40 mg were randomly distributed over 15 tanks of 300 L, representing five experimental treatments with three replicates per treatment. In the first stage, 200000 nauplii per liter of 26 ppt water were enriched with soya lecithin (74.42% phospholipid) for 12 hours. The enrichment emulsion was prepared by adding lecithin at the concentration of 0, 0.15, 0.3, 0.45 and 0.6 g ml-1. The newly hatched nauplii were collected for 12 hours, washed and fed to the fish larvae six times daily (at 8:00, 10:00,12,14, 16:00, 20:00) for a period of 15 days, followed by un-enriched nauplii and commercial until day 25 of growth. The results showed no significant differences in growth performance (BW and SGR) and also in survival of sturgeon larvae fed enriched and non-enriched nauplii (P 0.05). It is concluded that use of soybean lecithin enriched nauplii does not improve the growth and survival of the Persian sturgeon larvae.