Serhat Turkmen

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PhD @ University of Las Palmas de Gran Canaria, Research in Aquaculture Group (GIA), Spain

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21/12/18

Todos los que formamos el equipo del Instituto Universitario ECOAQUA de la @ULPGC, les deseamos una Feliz Navidad...❤️

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Nutritional reprogramming in fish: Importance of developmental windows

8th April 2015 by serhat Leave a Comment

Presented in Epiconcept Cost Action’s workshop Epigenomic Toolbox: from Methods to Models.

07-09 May 2014, Las Palmas, Spain

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Studies in mammals and humans show that dietary influences exerted at critical developmental stages early in life (neonatal nutrition, post-natal nutrition) may have long-term consequences on physiological functions in later life. Nutritional programming phenomenon is largely studied in mammalian models for the understanding of diseases such as the metabolic syndrome or diabetes. The functioning of certain metabolic pathways such as fatty acid metabolism in juvenile fish also depends on specific nutritional signals during the critical larval periods, demonstrating that the concept of metabolic programming also exists in fish. Modulation of key enzymes for fatty acid synthesis is possible by feed given to juveniles. The present study will examine the influences early nutritional programming either during embryonic phase or during metamorphosis. To affect nutrient intake during these two periods either broodstock or early weaning diets were modified and their effects studied on sea bream performance, lipid metabolism, gene expression and response after a feeding challenge. Specific genes such as those involved in essential fatty acids metabolism, were markedly affected by the nutritional programing at both developmental windows. For instance an up regulation of delta-6 desaturase gene expression was obtained when fish was conditioned with moderate levels of vegetable oils, whereas extreme conditioning conditions inhibited the expression. Despite it was potentially possible to condition fish during metamorphosis, the larvae were very sensitive during this period and high mortalities occurred during the treatment. When fishes were programmed through broodstock nutrition, a very high survival rate was obtained. Even extreme conditioning produced reliabe survival rates. After treatment with different conditioning during the embryonic period, all fish were fed standard fishmeal diet for three months and, afterwards, challenged with vegetable oils. A significant positive effect of the nutritional programming was observed in lipid metabolism response as well as a better utilization of the feeds. Grant support: European Commission, Directorate for Research & Innovation, Grant Agreement KBBE-2001-5-288925 (ARRAINA)

Meeting’s web page

Filed Under: Abstracts, My own articles Tagged With: developmental windows, epigenetics, gilthead sea bream, nutritional reprogramming

Growth response of European sea bass under different starvation cycles and feeding rates

1st April 2015 by serhat Leave a Comment

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The compensatory growth response of the European sea bass (Dicentrarchus labrax) faced cycling starvation and restricted ration was assessed. Juveniles (10.5 g) were stocked into 15 tanks at a density of 25 fish per tank. Five different feeding regimes were tested on triplicate groups of fish: CSatiation: control fed for 60 days without deprivation, CRestricted: 25% restricted feeding, S-R: 1 day starvation then 4 days CRestricted feeding, R-F: 1 day CRestricted feeding then 4 days CSatiation feeding, and, finally, S-F: 1 day starvation then 4 days CSatiation feeding. The specific growth rate of fish in the CSatiation (2.5±0.06 %/day), S-F (2.5±0.11 %/day) and R-F (2.4±0.18 %/day) were significantly higher than that of CRestricted (2.2±0.05 %/day) or S-R (2.0±0.01 %/day). Fish in S-F group was able to achieve catching up with the CSatiation. There was no significant difference in feed conversion rates but R-F and S-F consumed ~34% more feed than CSatiation following the first re-feeding day. While the highest lipid content was observed in CSatiation (14.4 %), S-R (33.3 % dry matter) had the highest water content compare to the CSatiation and CRestricted (37.8 and 36.9 % dry matter, respectively). In conclusion, it may be concluded that sea bass has rapid response to cycling starvation/re-feeding and that a 25% restricted feeding ratio is insufficient to invoke a compensatory growth response in sea bass.

Link to article: http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2109.2011.02970.x/abstract

Filed Under: My own articles Tagged With: feeding rate, Sea bass, starvation

Thermal tolerance of European sea bass

1st April 2015 by serhat Leave a Comment

Screen Shot 2015-04-02 at 12.09.23 AMThis study was carried out to determine upper (CTMax) and lower (CTMin) thermal tolerance, acclimation response ratio (ARR) and thermal tolerance polygon of the European sea bass inhabiting the Iskenderun Bay, the most southeasterly part of the Mediterranean Sea, at three acclimation temperatures (15, 20, 25 °C). Acclimation temperature significantly affected the CTMin and CTMax values of the fish. At 0.3 °C/min cooling or heating rate, CTMin ranged from 4.10 to 6.77 °C and CTMax ranged from 33.23 to 35.95 °C in three acclimation temperatures from 15 to 25 °C. Thermal tolerance polygon for the juveniles at the tested acclimation temperatures was calculated to be 296.14 °C. In general, the current data show that our sea bass population possesses acclimation response ratio (ARR) values (0.25–0.27) similar to some tropical species. The cold tolerance values attained for this species ranged from 4.10 to 6.77 °C, suggesting that cold winter temperatures may not pose danger during the culture of European sea bass in deep ponds or high water exchange rate systems. Upper thermal tolerance is more of a problem in the southern part of the Mediterranean as maximum water temperature in ponds may sometimes exceed 33–34 °C, during which underground cool-water should be used to lower ambient water temperature in the mid-summer. For successful culture of sea bass in ponds, temperature should be maintained around 25 °C throughout the year and this can be managed under greenhousing systems using underground well-waters, commonly available in the region.

Link to article: http://www.sciencedirect.com/science/article/pii/S0306456511001586

Filed Under: My own articles Tagged With: Sea bass, thermal tolerance

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