Abstract
Five diets were compared for their efficiency at maturing the gonads of the blue mussel, Mytilus edulis. The diets consisted of a 1:1:1 mixture of Isochrysis galbana (T-Iso), Pavlova lutheri, and Chaetoceros calcitrans given at concentrations of 2.4 × 1011 cells day−1 for the positive control treatment (PF) and 3.0 × 1010 cells day−1 (=1/8) for the negative control treatment (NF). The other three treatments, MB10+, MyStock+, and Frippak+, consisted of the NF diet supplemented with one of the micro-encapsulated diets MB10 (mixture of dried algae), MyStock (formulated diet), and FRiPPAK® Fresh #1 CAR (larval shrimp diet) at a level of 0.2% of the live weight (LW). Treatments PF, MB10+, and MyStock+ led to high percentages of spawning animals (80, 78, and 85%, respectively) and large numbers of eggs (on average 3.0 × 106 eggs female−1). Females given the NF and Frippak+ treatments produced only half the number of eggs per female, and only 17 and 6%, respectively, of the animals spawned. A high hatching rate was observed for all treatments, 71% for the pure algae diets PF and NF and more than 80% for the micro-encapsulated diets. The larvae resulting from the NF treatment were smaller, with 41% of D-larvae measuring less than 90 μm, whereas with the other treatments only 5–11% belonged to that size category. The four most important fatty acids found in mussel eggs were 16:0, 16:1(n−7), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA); these represented at least 50% of the fatty acids in all treatments. The high DHA content of MB10 and MyStock was not reflected in the fatty acid composition of the eggs whereas the high concentration of linoleic acid in MyStock was. To our knowledge, this is the first time that mussels are successfully conditioned with formulated feeds.
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Abbreviations
- LW:
-
Live weight
- PF:
-
Positive control treatment
- NF:
-
Negative control treatment
- MB10+:
-
NF + 0.2% formulated diet MB10
- MyStock+:
-
NF + 0.2% formulated diet MyStock
- Frippak+:
-
NF + 0.2% FRiPPAK® Fresh #1 CAR
- FAME:
-
Fatty acid methyl esters
- DW:
-
Dry weight
- EPA:
-
Eicosapentaeneoic acid
- DHA:
-
Docosahexaenoic acid
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Nevejan, N.M., Pronker, A.E. & Peene, F. Hatchery broodstock conditioning of the blue mussel Mytilus edulis (Linnaeus, 1758). Part II. New formulated feeds offer new perspectives to commercial hatcheries. Aquacult Int 16, 483–495 (2008). https://doi.org/10.1007/s10499-007-9160-8
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DOI: https://doi.org/10.1007/s10499-007-9160-8