J.A. Pérez

J.A. Pérez
University of La Laguna | ULL · Department of Animal Biology, Edafology and Soil Science

Doctor of Biology

About

52
Publications
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Publications

Publications (52)
Article
Full-text available
Macroalgal wracks can be considered unpleasant for beach users and, consequently, they are usually collected from most touristic beaches and discarded. However, seaweeds are an important source of bioactive lipid compounds, such as phospholipids, glycolipids, and n-3 polyunsaturated fatty acids (n-3 PUFA), displaying multiple health-promoting prope...
Article
Full-text available
Lactic acid bacteria (LAB) probiotics were evaluated for their impact on the microbiota and development of pikeperch (Sander lucioperca) larvae during their initial feeding stage (first 21 days). Pikeperch larvae were exposed to LAB probiotics in two ways: (1) via the live-feed only (Treatment 1, live-feed) or (2) via the live-feed and the larval c...
Article
Full-text available
Live prey used by the aquaculture industry are usually poor in some essential nutrients including long chain polyunsaturated fatty acids (LC-PUFA) and must be enriched to improve their nutritional value prior to larval feeding. Standard enrichment protocols are commonly based on lipid emulsions, being associated to a high oxidative stress condition...
Article
Full-text available
The pathogenesis of obesity-related-renal disease is unknown. Menopause can promote renal disease in obese women, but this interaction is unclear. In a previous study, we observed that obese male and female mice developed albuminuria, hyperfiltration, and glomerulomegaly, and these changes were more severe in those obese ovariectomized females. In...
Article
Background and Aims The pathogenesis of obesity related-renal disease is unknown. Gender differences may have a role in renal damage in obesity. In particular, menopause can promote renal disease in obese women. In a previous study we observed that obese male and female mice developed albuminuria, hyperfiltration and glomerulomegaly, and these chan...
Article
Full-text available
The capacity to biosynthesise long-chain (≥C20) polyunsaturated fatty acids (LC-PUFA) depends upon the complement and function of key enzymes commonly known as fatty acyl desaturases and elongases. The presence of a Δ5/Δ6 desaturase enabling the biosynthesis of docosahexaenoic acid (22:6n-3, DHA) through the "Sprecher pathway" has been reported in...
Article
Full-text available
Macroalgae have been recently described as a potential ingredient for aquafeeds, exerting several physiological benefits. Grass carp (Ctenopharyngodon idella) is a freshwater species, which has been the major fish species produced in the world in the last years. In order to determine the potential use of macroalgal wracks in fish feeding, C. idella...
Article
Pikeperch (Sander lucioperca) intensive aquaculture development has been slowed down by high mortality rates (>70%) during larval rearing. The use of taurine during larval development in other species has been reported to improve survival as well as growth. This trial aims to find out whether supplementation of taurine during the larval stage will...
Article
Full-text available
The currently limited knowledge on the nutritional requirements of the European lobster (Homarus gammarus) remains a major obstacle to the improvement of growth and survival rates in lobster farming. Therefore, digestive enzyme activity (trypsin, lipase, and amylase) and biochemical indices (RNA:DNA, proximate and lipid class composition) of larval...
Article
Full-text available
There is a growing interest to understand the capacity of farmed fish species to biosynthesise the physiologically important long-chain (≥C20) n-3 and n-6 polyunsaturated fatty acids (LC-PUFAs), eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA) and arachidonic acid (ARA), from their C18 PUFA precursors available in the diet. In fish, the LC-P...
Article
In order to increase omega-3 (n-3) long-chain polyunsaturated fatty acids (LC-PUFA) availability and to improve the design of rotifer's enrichment protocols for marine larvae production, the endogenous fatty acid (FA) metabolism of the marine rotifer, Brachionus plicatilis was determined. To this purpose, the in vivo ability of this species to inco...
Article
The lipid and fatty acid profiles of 14 marine macroalgal species from the Madeira Archipelago, including two green (Ulvales and Dasycladales), three red (Corallinales, Bonnemaisoniales, and Ceramiales) and nine brown (Fucales, Dictyotales, and Sphacelariales) species were characterised in order to determine their potential use for animal and human...
Article
Full-text available
Objective: Obese patients with metabolic syndrome have a high risk of chronic kidney disease. The prevalence of obesity, metabolic syndrome, and insulin resistance increase in women after menopause, as does the risk of chronic kidney disease. This may indicate an interaction between obesity, metabolic syndrome, and menopause in the induction of re...
Article
Despite its legislative regulation and control, the quality and safety of aquatic products is somewhat questioned due to the potential bioaccumulation of pollutants. The elements (Al, B, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Mo, Na, Ni, Pb, Sr, V and Zn) were determined in the liver and muscle of wild and captive-reared Seriola dumerili with t...
Article
Westernized societies ingest an unhealthy high dietary omega-6/omega-3 fatty acid ratio of 20:1 or even higher. Seafood is the primary source of omega-3 long chain polyunsaturated fatty acids (LC-PUFA) for humans, mainly eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which are involved in a plethora of physiological and health-related...
Article
Full-text available
Fish vary in their ability to biosynthesise long-chain polyunsaturated fatty acids (LC-PUFA) depending upon the complement and function of key enzymes commonly known as fatty acyl desaturases and elongases. It has been reported in Solea senegalensis the existence of a Δ4 desaturase, enabling the biosynthesis of docosahexaenoic acid (DHA) from eicos...
Article
The in vivo ability of Atlantic halibut (Hippoglossus hippoglossus) larvae to incorporate, deacylate and reacylate [1-¹⁴C]fatty acids (FA) into lipid classes and to elongate and desaturate those substrates was elucidated. To this purpose, 30 days post-first-feeding (30 dpff) larvae were incubated in the presence of either free [1-¹⁴C]-FAs (18:2n-6,...
Article
An overall synchronization of morphological and physiological ontogenetic events of the digestive and antioxidant defence systems occurred in greater amberjack (Seriola dumerili) larvae reared under intensive (INT) or semi‐intensive (MES) conditions for 30 days. The first differentiations of the digestive channel took place at 3–4 days post‐hatch (...
Article
Knowledge on dietary nutrient requirements of first-feeding European eel larvae (Anguilla anguilla) is very limited. This study provides first ever information on in vivo lipid uptake and fatty acid (FA) metabolism of European pre-leptocephalus eel larvae and advances directions for dietary lipid and FA inclusions. The in vivo capability of eel lar...
Article
To elucidate the in vivo endogenous ability of pikeperch (Sander lucioperca) larvae to deacylate and reacylate phospholipids and to elongate and desaturate PUFAs, 20 days post hatch (DPH) fish were incubated with either [1-¹⁴C]20:4n-6 bound to PC and PE, or with free [1-¹⁴C]-labelled fatty acids (18:2n-6, 18:3n-3, 20:4n-6, 20:5n-3 and 22:6n-3). The...
Article
Full-text available
Carps, barbels and other cyprinids are the major contributors to freshwater aquaculture at global scale. Nevertheless, freshwater fish aquaculture needs to diversify their production in order to offer consumers new species. Tench (Tinca tinca) is a freshwater species with great interest for the diversification of continental aquaculture. However, u...
Article
Full-text available
The long-chain (≥C20) polyunsaturated fatty acid biosynthesis capacity of fish varies among species, with trophic level hypothesised as a major factor. The biosynthesis capacity is largely dependent upon the presence of functionally diversified fatty acyl desaturase 2 (Fads2) enzymes, since many teleosts have lost the gene encoding a Δ5 desaturase...
Conference Paper
Full-text available
Seriola dumerili is a very promising species for the diversification of marine aquaculture. The commercial production requires obtaining a sufficient number of fertilized quality eggs. It is necessary to develop diets in line with the nutritional requirements of broodstock to improve the development and quality of gametes and obtain reproductive su...
Article
Combinations of nutritional requirements and husbandry rearing conditions during early ontogeny are poorly studied in pikeperch (Sander lucioperca). The substitution of marine oils with vegetable oils has reduced stress tolerance and caused neurophysiological changes in pike perch larvae, but effects of environmental cues are limited. Saline water...
Article
Full-text available
In the last decades, the development of new technologies applied to lipidomics has revitalized the analysis of lipid profile alterations and the understanding of the underlying molecular mechanisms of lipid metabolism, together with their involvement in the occurrence of human disease. Of particular interest is the study of omega-3 and omega-6 long...
Article
Aquaculture plays an important role in supplying the fresh fish. However its production is dominated by only few long-established species that in turn limit the variety of available products in the market. Therefore, new fish species need to be properly introduced to create a diversification in the current market. In order to achieve this goal, it...
Article
Meagre Argyrosomus regius is considered a new species for the diversification of finfish aquaculture in the Mediterranean. Several bottlenecks have been identified by producers, and among them, the necessity to establish early weaning protocols to reduce production costs. In this study, two experiments were carried out with meagre larvae from 2 to...
Article
Full-text available
The greater amberjack Seriola dumerili is a large teleost fish with rapid growth and excellent flesh quality, whose domestication represents an ambitious challenge for aquaculture. The occurrence of reproductive dysfunctions in greater amberjack reared in captivity was investigated by comparing reproductive development of wild and captive-reared in...
Data
Biometric data, sex steroids, leptin and gonad biochemical composition of wild and captive-reared greater amberjack. (XLSX)
Data
Similarity of the predicted Seriola dumerili ORF to leptin amino acid sequences derived from various Perciformes. (DOCX)
Data
Partial cDNA and deduced amino acid sequences of greater amberjack leptin. The putative alpha helix domains are specified. (TIF)
Data
Proximate (a) and main fatty acids composition (b) of greater amberjack broodstock diet. (DOC)
Article
Pigmentation capability of red porgy (Pagrus pagrus) skin reared under open sea-cage conditions and fed an astaxanthin-enriched diet was studied. Skin lipid peroxide levels and lipid composition were also evaluated to establish the antioxidant role of astaxanthin under these sunlight-exposure conditions. Fish placed either in an offshore sea cage s...
Article
Two experiments were carried out to study the effect of n-3 HUFA levels in rotifers on survival, growth, activity and fatty acid composition of gilthead bream, Sparus aurata (L.), larvae. From the third to the 15th day after hatching, gilthead bream larvae received one of the three kinds of rotifers containing different percentages of n–3 HUFA. Moi...
Article
The present study was undertaken to establish whether the formation of 22:6n-3 from 18:3n-3 and/or 20:5n-3 can occur in turbot liver and if this conversion is consistent with the operation of a Delta4 desaturase-independent pathway. At the same, time the effects of feeding a diet devoid of long chain polyunsaturated fatty acids (PUFA) on the patter...
Article
To study the intestinal fatty acid absorption in fish in vitro, enterocytes were isolated from the intestine of rainbow trout and incubated with an equimolar mixture of seven fatty acids [16:0, 18:1n-9, 18:2n-6, 18:3n-3, 20:4n-6, 20:5n-3 and 22:6n-3] in which the component carrying a radioactive label was varied. The fatty acid mixture was presente...
Article
Three day-old Sparus aurata larvae were fed rotifers (Brachionus plicatilis) previously enriched with four lipid emulsions containing different percentages (10–30%) of n−3 highly unsaturated fatty acids (HUFA) but a fixed docosahexaenoic (DHA; 22:6n−3) to eicosapentaenoic acid (EPA; 20:5n−3) ratio of about 2/1. The n−3 HUFA content of the enriched...
Article
A feeding experiment was carried out to investigate the influence of the eicosapentaenoic acid (EPA, 20:5n − 3) to docosahexaenoic acid (DHA, 22:6n − 3) ratio (EPADHA) on 17-day-old Sparus aurata larval development. Larvae were fed rotifers (Brachionus plicatilis) enriched with four different lipid emulsions containing the same amount of total n −...
Article
Several enrichment conditions (type and concentration of oil in culture medium and time of enrichment) were tested in order to study their influence on rotifer (Brachionus plicatilis) lipid and fatty acid composition as well as on its population profile. Rotifers pre-fed on baker's yeast (Saccharomyces cerevisiae) were enriched with lipid emulsions...
Article
A feeding experiment on n-3 highly unsaturated fatty acids (n-3 HUFA) requirement in gilthead seabream, Sparus aurata, larvae was carried out using rotifers containing different percentages of n-3 HUFA, ranging from 0.16% to 7.42% on a dry weight basis (DWB). The enriched rotifers showed a direct relationship between their n-3 HUFA contents and the...

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