Publications by authors named "Victor H Marques"
Alterations in Gene Expression and the Fatty Acid Profile Impact but Do Not Compromise the In Vitro Maturation of Zebrafish () Stage III Ovarian Follicles after Cryopreservation.
Animals (Basel)
November 2023
The vitrification of ovarian follicles is a strategic tool that may contribute to advances in aquaculture and the conservation of many important species. Despite the difficulties inherent to the cryopreservation of oocytes, some successful protocols have been developed for different species, but little is known about the capacity of oocytes to develop after thawing. Therefore, the profiles of the reproductive pathway genes and fatty acid membrane composition during the initial stages of development were analyzed in fresh ovarian follicles and follicles after the vitrification process.
View Article and Find Full Text PDFInfluence of Docosahexaenoic and Eicosapentaenoic Acid Ratio and Temperature on the Growth Performance, Fatty Acid Profile, and Liver Morphology of Dusky Grouper () (Teleostei: Serranidae) Juveniles.
Animals (Basel)
October 2023
Article Synopsis
- - An 8-week trial assessed how different ratios of DHA (docosahexaenoic acid) and EPA (eicosapentaenoic acid) along with temperature variations affect fatty acid metabolism and liver structure in fish.
- - Fish fed the highest DHA level (1.5%) displayed better growth in warmer temperatures, but the DHA/EPA ratio didn't impact overall performance at either temperature.
- - Temperature significantly influenced lipid deposition and fatty acid profiles in muscle, liver, and eyes, highlighting the importance of both temperature and a balanced fat ratio in the diet for optimal marine fish health.
Article Synopsis
- Researchers studied how cobia fish's liver responds after eating by analyzing their gene expression and fatty acid profiles over a 24-hour period.
- They fed the fish, fasted them, and then collected liver samples at various intervals to see how the diet affected specific fatty acids and gene activities.
- The findings revealed that the best time to assess the liver's response was between 8 to 12 hours after feeding, as gene expression changes were minimal at 24 hours, indicating they were less impacted by food intake.
Phospholipids (PL) are membrane components composed of fatty acids (FA), while triglycerides (TG) are a main source of energy and essential FA. Polyunsaturated FA (PUFA), such as docosahexaenoic acid (DHA), and eicosapentaenoic acid (EPA), are essential for marine carnivorous fish; thus, an 8-week experiment was performed to evaluate the influence of DHA and EPA, provided as PL and TG, on the morphophysiology of juveniles. A basal diet was manufactured, and DHA and EPA in PL form (PL1-low amount PL2-high amount) and TG form (TG1-low amount; TG2-high amount) were added.
View Article and Find Full Text PDFIt has been postulated that eutrophication causes replacement of n3 highly unsaturated fatty acids (n3 HUFA) rich taxa, such as Bacillariophyta, Cryptophyta and Dinophyta, with taxa poor in these fatty acids (FA), such as Chlorophyta and Cyanobacteria. Such a change in community composition at the basis of the food web may alter the FA composition of consumer tissues. Here, we investigated the effects of eutrophication on phytoplankton composition and FA profiles of seston and muscle of two omnivorous fish species (Astyanax fasciatus and Astyanax altiparanae) from reservoirs of different trophic status in Southeast Brazil.
View Article and Find Full Text PDFThe present study aimed to evaluate two different methods of artificial reproduction induction, and characterize the embryonic development of Salminus hilarii. Different than observed for other tropical fish species, artificial reproduction induction followed by hand-stripping of gametes was considered unfeasible for S. hilarii, as no gamete fertilization was observed.
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