Effects of dietary n-3 HUFA concentrations on spawning performance and fatty acids composition of broodstock, eggs and larvae in yellowfin sea bream, Acanthopagrus latus

This study investigated the effect of n‐3 to n‐6 fatty acid ratios in broodstock diets on reproduction performance, fatty acid composition of eggs and gonads of tongue sole Cynoglossus semilaevis. Broodstock were fed five isonitrogenous and isoenergetic diets for 60 days. The supplemented lipids were prepared by a combination of fish oil and soybean oil inclusion FO (fish oil); FSO1 (fish oil: soybean oil = 7:1); FSO2 (fish oil: soybean oil = 2.2:1); FSO3 (fish oil: soybean oil = 1:1); FSO4 (fish oil: soybean oil = 1:4.3) as lipid sources with different n‐3 to n‐6 fatty acid ratios 10.40, 5.21, 2.81, 1.71 and 0.87. Results showed that relative fecundity, fertilization rate and survival rate of larvae at 7 days posthatching were all higher in broodstock fed FSO1 and FSO2 diet and significantly (P < 0.05) decreased in groups fed FSO3 and FSO4 diets. The best result in starvation tolerance test was obtained in FSO2 diet. The present study suggests that n‐3 and n‐6 PUFA ratio in broodstock diet has a considerable effect on spawning performance, egg and larval quality for C. semilaevis.

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“…; Zakeri et al . ). Some studies have indicated that both n‐6 and n‐3 fatty acids are necessary for larvae and broodstock (Bessonart et al .…”

Section: Discussionmentioning

confidence: 97%

“…SAI was calculated from the following equation (Zakeri et al . ):

SAI = \sum_{i = 1}^{k} (N - h_{i}) \times i / N

where N is the total number of supplied larvae, h i is the cumulative mortality by the i ‐th day, and k is the number of days elapsed until all larvae died due to starvation.…”

Section: Methodsmentioning

confidence: 99%

Effects of dietary n-3 to n-6 fatty acid ratios on spawning performance and larval quality in tongue soleCynoglossus semilaevis

Liang

Qian

et al. 2013

Aquacult Nutr

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“…Indeed, there was a difference in the content of DHA between Cladocera and Copepoda, regardless of temperature. Climatic warming is known to reduce the relative abundance of copepods and increase that of cladocerans in the zooplankton (Hampton et al ., ; Thompson, St‐Jacques & Vinebrooke, ; Visconti, Manca & de Bernardi, ; but see Dupuis & Hann, ), thus decreasing the overall content of DHA, essential for fish (Sargent et al ., ; Tocher, ; Zakeri et al ., ; Trushenski et al ., ). We found previously a low content of DHA in pooled samples of zooplankton from warm lakes, which correlated with a low percentage of copepods in the community (Gladyshev et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Fatty acid composition of Cladocera and Copepoda from lakes of contrasting temperature

et al. 2014

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Summary We studied the fatty acid (FA) composition of six species of Cladocera and six species of Copepoda from five cold‐water lakes, situated in the tundra and/or in the mountains, and eight species of Cladocera and four species of Copepoda from eight warm‐water lakes (including one reservoir) in temperate regions. We asked whether the contrasting temperature would result primarily simply in changes in the percentages (i.e. percentage of total FAs) and absolute contents (quantities) of the long‐chain polyunsaturated fatty acids (PUFAs), eicosapentaenoic acid (20:5n‐3, EPA) and docosahexaenoic acid (22:6n‐3, DHA), or whether there are other FAs with various number of double bonds and/or chain lengths which could be responsible for a putative homeoviscous adaptation. We also aimed to reveal any consistent phylogenetic differences in FA percentages and contents between Cladocera and Copepoda, separable from any temperature effects. Both taxa in warm waters had greater percentages of 18:0, and lower percentages of 14:0 and 18:4n‐3, than in cold waters, but there were no differences in percentages of DHA. In addition, Cladocera, besides the lower percentage of EPA, had higher percentages of 20:0 and 22:0 in warm waters. These patterns in the percentages of 14:0, 18:0, 18:4n‐3, 20:0 and 22:0 are in a good agreement with the hypothesis of homeoviscous adaptation. Thus, the role of EPA, and particularly DHA, as unique regulators of the homeoviscous adaptation of the zooplankton may have been overestimated. Overall, we confirmed the known differences between Cladocera and Copepoda, namely higher percentages of EPA in Cladocera and higher percentages of DHA in Copepoda. However, there was c. 50% overlap in the ranges of the percentage of EPA in Cladocera and Copepoda, while the ranges in the content of EPA per unit organic carbon in Cladocera and Copepoda overlapped completely. Differences in the percentages and content of DHA between Cladocera and Copepoda were statistically significant and invariant with temperature, and therefore are probably due to phylogenetic factors, rather than any temperature adaptation. Contrasting temperature was not associated with significant differences in the contents of EPA and DHA per unit of organic carbon within the taxa studied. If this remained the case in a warming climate, such warming would be unlikely to reduce the accumulation of these important PUFAs in the zooplankton, at least if species composition was unchanged. However, if there were shifts in the proportions of Cladocera and Copepoda in the zooplankton, for example fewer copepods as temperature rises, a decrease of the flux of PUFA in the ecosystem is plausible, taking into account the phylogenetic (and temperature invariant) differences in DHA between the two groups.

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“…Indeed, DHA composes up to approximately 30% of fish brain lipids (Shields et al, ), but the capacity of most fish to synthesize this HUFA from short‐chain precursors is very limited (Tocher, ). Thus, shortage in food supply of DHA significantly affects fish growth and development (Vizcaino‐Ochoa et al, ; Zakeri et al, ). According to our data, in the warm rivers, standing stock and production of zoobenthos, as the main food supply for fish, had significantly lower DHA content.…”

Section: Discussionmentioning

confidence: 99%

Secondary Production of Highly Unsaturated Fatty Acids by Zoobenthos Across Rivers Contrasting in Temperature

et al. 2015

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Highly unsaturated fatty acids (HUFA), namely eicosapentaenoic acid (20:5n‐3, EPA) and docosahexaenoic acid (22:6n‐3, DHA), which are essential for many animals, including humans, are mainly produced in aquatic trophic webs. In fast‐flowing rivers, macrozoobenthos is the main source of HUFA for fish and may be particularly vulnerable to thermal alterations associated with climate change. We studied benthic communities in a unique natural ecosystem: the Yenisei River downstream of the dam of Krasnoyarsk Hydroelectric Power Station with very low temperature in summer because of discharge of cold water from deep in the reservoir and its tributaries with high summer temperature. This ‘natural experiment’ allowed to get rid of confounding factors, such as differences in light, seasonality, geology (biogeochemistry) and biogeography (regional species pools). As found, in spite of an increase of biodiversity and rates of daily production in warm rivers compared with cold sites, DHA and partly EPA production of zoobenthos decreased with the increase of temperature because of changes in species composition. Thus, in a climate warming context, we can predict a decrease of production of these HUFA by river zoobenthos and thereby a diminishing of their supply for fish and next to humans. Copyright © 2015 John Wiley & Sons, Ltd.

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Effects of dietary n-3 HUFA concentrations on spawning performance and fatty acids composition of broodstock, eggs and larvae in yellowfin sea bream, Acanthopagrus latus

Cited by 83 publications

References 46 publications

Effects of dietary n-3 to n-6 fatty acid ratios on spawning performance and larval quality in tongue soleCynoglossus semilaevis

Effects of dietary n-3 to n-6 fatty acid ratios on spawning performance and larval quality in tongue soleCynoglossus semilaevis

Fatty acid composition of Cladocera and Copepoda from lakes of contrasting temperature

Secondary Production of Highly Unsaturated Fatty Acids by Zoobenthos Across Rivers Contrasting in Temperature

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