Publications by authors named "Freddy Silva Sergent"
Article Synopsis
- - Ciguatera is a foodborne illness caused by ciguatoxins (CTXs) produced by certain dinoflagellates, which accumulate in fish and can poison humans, with dusky grouper being a significant species in this context in the Canary Islands.
- - The study experimented with adult dusky groupers fed diets of fish naturally contaminated with CTXs to assess the effects of these toxins over time (4 to 18 weeks).
- - While the groupers didn’t show behavioral changes, biochemical tests indicated potential liver damage and disruptions in metabolic processes, highlighting the need for further research on the fish's health impacts.
Ciguatoxins (CTXs) are marine neurotoxins that cause ciguatera poisoning (CP), mainly through the consumption of fish. The distribution of CTXs in fish is known to be unequal. Studies have shown that viscera accumulate more toxins than muscle, but little has been conducted on toxicity distribution in the flesh, which is the main edible part of fish, and the caudal muscle is also most commonly targeted for the monitoring of CTXs in the Canary Islands.
View Article and Find Full Text PDFYersiniosis, caused by the fish pathogen Yersinia ruckeri, is a serious bacterial septicaemia affecting mainly salmonids worldwide. The acute infection may result in high mortality without apparent external disease signs, while the chronic one causes moderate to considerable mortality. Survivors of yersiniosis outbreaks become carriers.
View Article and Find Full Text PDFThe Canary Islands are a ciguatoxin (CTX) hotspot with an established official monitoring for the detection of CTX in fish flesh from the authorised points of first sale. Fish caught by recreational fishermen are not officially tested and the consumption of toxic viscera or flesh could lead to ciguatera poisoning (CP). The objectives of this study were to determine the presence of CTX-like toxicity in relevant species from this archipelago, compare CTX levels in liver and flesh and examine possible factors involved in their toxicity.
View Article and Find Full Text PDFArticle Synopsis
- - On intensive fish farms, 10% of fish die from pathogens, with a bacteria called subsp. subsp. causing pasteurellosis being a major threat.
- - Researchers aimed to find new probiotic strains to combat pasteurellosis and reduce reliance on harmful chemotherapy treatments.
- - Out of 122 isolated strains from marine fish gills and intestines, only one showed strong potential as a probiotic, warranting further study for its protective effects in marine aquaculture.
Article Synopsis
- Ciguatoxins (CTXs) are harmful toxins made by dinoflagellates found in warmer ocean waters, which can accumulate in fish and cause ciguatera fish poisoning in humans.
- An experiment was conducted using goldfish fed fish muscle contaminated with Caribbean ciguatoxin (C-CTX1) to understand how these toxins are taken up by fish.
- Results showed that while CTXs accumulated in the goldfish muscles and led to symptoms like lethargy, the fish could recover and detoxify when switched to a non-toxic diet after some time.
Local population frequently consumes moray eels and dusky groupers from the Canary Islands. These species are top predators and the interactions between them include predation but also, in some cases, collaborative hunting. These fish are well known to cause ciguatera (CFP) outbreaks in several marine areas such as Japan, Hawaii, French Polynesia and Caribe.
View Article and Find Full Text PDFThis research identifies factors associated with the contamination by ciguatoxins (CTXs) in a population of fish and proposes a predictive score of the presence of CTX-like toxicity in amberjack samples from the official control program of ciguatera in the Canary Islands of the Directorate-General (DG) Fisheries (Canary Government). Out of the 970 samples of fish studied, 177 (18.2%) samples showed CTX-like toxicity.
View Article and Find Full Text PDFBackground: The importance of pigeons as reservoirs and carriers of Cryptococcus neoformans and other species of this genus is well-known; however, less is known about their role as reservoirs and carriers of other yeasts that impact public health.
Aims: The present study was performed on Gran Canaria Island to define yeasts other than Cryptococcus spp. that have been reported to impact public health and which could be carried by pigeons.