Lipid content and fatty acid distribution in tissues from Portuguese dogfish, leafscale gulper shark and black dogfish

Remme, Jannicke Fugledal; Larssen, Wenche Emblem; Bruheim, Inge; Sæbø, Per Christian; Sæbø, Asgeir; Stoknes, Iren

doi:10.1016/j.cbpb.2005.12.018

Cited by 28 publications

(25 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sandbar shark and skate blood and muscle samples did not undergo lipid extractions since all samples had consistently low lipid content (C:N \ 3.0). Shark liver has a high lipid content (Remme et al, 2006), and since lipids were not removed, only liver d 15 N values are presented. All tilapia samples were analyzed in duplicate (bulk tissue and lipid-extracted tissue) to avoid potential effects of extraction procedures on d 15 N values (Pinnegar & Polunin, 1999;Sotiropoulos et al, 2004).…”

Section: Sample Preparationmentioning

confidence: 99%

Stable isotope dynamics in elasmobranch fishes

2010

View full text Add to dashboard Cite

Carbon and nitrogen stable isotope analyses have improved our understanding of food webs and movement patterns of aquatic organisms. These techniques have recently been applied to diet studies of elasmobranch fishes, but isotope turnover rates and isotope diet-tissue discrimination are still poorly understood for this group. We performed a diet switch experiment on captive sandbar sharks (Carcharhinus plumbeus) as a model shark species to determine tissue turnover rates for liver, whole blood, and white muscle. In a second experiment, we subjected captive coastal skates (Leucoraja spp.) to serial salinity reductions to measure possible impacts of tissue urea content on nitrogen stable isotope values. We extracted urea from spiny dogfish (Squalus acanthias) white muscle to test for effects on nitrogen stable isotopes. Isotope turnover was slow for shark tissues and similar to previously published estimates for stingrays and teleost fishes with low growth rates. Muscle isotope data would likely fail to capture seasonal migrations or diet switches in sharks, while liver and whole blood would more closely reflect shorter term movement or shifts in diet. Nitrogen stable isotope values of skate blood and skate and dogfish white muscle were not affected by tissue urea content, suggesting that available diet-tissue discrimination estimates for teleost fishes with similar physiologies would provide accurate estimates for elasmobranchs.

show abstract

Section: Sample Preparationmentioning

confidence: 99%

Stable isotope dynamics in elasmobranch fishes

2010

View full text Add to dashboard Cite

show abstract

“…Fatty acids, mainly eicosapentaenoic (EPA) and docosahexaenoic (DHA) acids, are known to play a major role in several biochemical processes in vivo and in vitro (Økland et al, 2005;Remme et al, 2006) and in the case of human newborn infants it is well known that they are carried from maternal circulation across the placenta into the fetal venous blood (Connor et al, 1996). In deep-sea fish, particularly in the shark species, there is scarce information about this fact.…”

Section: Introductionmentioning

confidence: 99%

Atlantic Multidecadal Oscillation (AMO) and sea surface temperature in the Bay of Biscay and adjacent regions

García-Soto

Pingree

2011

J. Mar. Biol. Ass.

View full text Add to dashboard Cite

Little information is available on the maternal -embryonic relationships among sharks. Birdbeak dogfish (Deania calcea) has been described as ovoviviparous, but this term comprises a wide range of forms on how the embryos are nourished including lecithotrophy and matrotrophy. To evaluate the maternal -embryonic relationship in birdbeak dogfish we have analysed chemical features (fatty acid composition and mercury (Hg) levels) and biological characteristics (egg and embryo dry weight variation, uterus characterization). Monounsaturated fatty acids were the dominant fatty acids in eggs while polyunsaturated fatty acids (PUFA) were the dominant fatty acids in both pregnant females and embryos. Significant differences were found among eggs, embryos and pregnant females for all fatty acids groups with the exception of saturated fatty acids for embryos and pregnant females. The principal components analysis revealed that embryos are particularly related to n-6 PUFA and pregnant females with n-3 PUFA. A close relationship exists between the Hg level of pregnant females and the Hg level of their embryos which indicates that there is a transfer of mercury from maternal sources. The comparison of the mean dry weight between eggs and embryos showed a gain of 3.8% obtained in the embryos. Histological sections of the uteri of pregnant females showed a high level of both superficial and inner vascularization in the uterine villi as well as the presence of secretor cells. Until now, the importance of this species maternal contribution and interference for the embryos development has never been documented. However, the biological and chemical results observed in the present work show that there is a matrotrophic strategy for the birdbeak dogfish.

show abstract

“…The fatty acid signatures of both prey and predator (flesh and liver) deep sea fish were typical of other fish species, containing a high proportion of 16:0, 18:1 and 22:6 (Dalsgaard et al, 2003 andRemme et al, 2006) (Fig. 3).…”

Section: Discussionmentioning

confidence: 97%

“…The dominant fatty acid in both the black scabbard and black dogfish liver was 18:1(nÀ9). A high proportion of 18:1(nÀ9) has been reported as a characteristic of deep-sea organisms; 18:1(nÀ9) is the dominant fatty acids in carnivorous copepods (Remme et al, 2006). PCA showed there were differences in the fatty acid profiles of the liver of all three predator species.…”

Section: Discussionmentioning

confidence: 97%