Egg quality determinants in cod (Gadus morhua L.): egg performance and lipids in eggs from farmed and wild broodstock

By G. Salze, D. Tocher, W. Roy, D. A. Robertson. 2005

193 citations recorded by the source corpus.

Lipids and essential fatty acids, particularly the highly unsaturated fatty acids, 20:5n-3 (eicosapentaenoic acid; EPA), 22:6n-3 (docosahexaenoic acid; DHA) and 20:4n-6 (arachidonic acid, AA) have been shown to be crucial determinants of marine fish reproduction directly affecting fecundity, egg quality, hatching success, larval malformation and pigmentation. In Atlantic cod (Gadus morhua L.) culture, eggs from farmed broodstock can have much lower fertilization and hatching rates than eggs from wild broodstock. The present study aimed to test the hypothesis that potential quality and performance differences between eggs from different cod broodstock would be reflected in differences in lipid and fatty acid composition. Thus eggs were obtained from three broodstock, farmed, wild/fed and wild/unfed, and lipid content, lipid class composition, fatty acid composition and pigment content were determined and related to performance parameters including fertilization rate, symmetry of cell division and survival to hatching. Eggs from farmed broodstock showed significantly lower fertilization rates, cell symmetry and survival to hatching rates than eggs from wild broodstock. There were no differences in total lipid content or the proportions of the major lipid classes between eggs from the different broodstock. However, eggs from farmed broodstock were characterized by having significantly lower levels of some quantitatively minor phospholipid classes, particularly phosphatidylinositol. There were no differences between eggs from farmed and wild broodstock in the proportions of saturated, monounsaturated and total polyunsaturated fatty acids. The DHA content was also similar. However, eggs from farmed broodstock had significantly lower levels of AA, and consequently significantly higher EPA/AA ratios than eggs from wild broodstock. Total pigment and astaxanthin levels were significantly higher in eggs from wild broodstock. Therefore, the levels of AA and phosphatidylinositol, the predominant AA-containing lipid class, and egg pigment content were positively related to egg quality or performance parameters such as fertilization and hatching success rates, and cell symmetry.

Subfields: Aquatic Science, Global and Planetary Change, Physiology

View Paper: https://www.semanticscholar.org/paper/6b7fa700de882ec8f97fc6298e44fa7ddb48d2b9

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Aquatic Science

1. R. L. Olsen
2. Ronald B. Johnson
3. J. Bell
4. J. Bobe
5. H. Mundheim
6. D. Tocher
7. E. Ringø

In Global and Planetary Change

1. Ronald B. Johnson
2. J. Bell
3. J. Bobe

In Physiology

1. M. Carrillo
2. Ronald B. Johnson
3. E. Cabrita
4. J. Bell
5. M. Herráez
6. J. Bobe
7. H. Mundheim

Citations in the corpus

• Element concentrations in meals from krill and amphipods, — Possible alternative protein sources in complete diets for farmed fish (2006, background): “Krill meal also contains relatively high levels of phospholipids (Saito et al., 2002) which may be utilised in diets for marine fish, in particular larvae, which require high levels of marine phospholipids (Salze et al., 2005; Hamre et al., in press).”
• Lipid Deposition in Oocytes of Teleost Fish During Secondary Oocyte Growth (2009, background): “Recently, Salze et al. (2005) provided some insight into the role of ARA in the fertilized egg.”
• Gamete quality and broodstock management in temperate fish (2013, background): “However, when developing broodstock diets for any fish species it is useful to analyse the fatty acid composition of wild eggs as these provide useful information for optimizing dietary formulations (Tocher & Sargent 1984; Bell & Sargent 2003; Salze et al. 2005).”