Naslov
Genetic variability in members of Didymozoidae family isolated from two bluefin tuna species

Autori
Mladineo, Ivona ; Block, Barbara

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
Abstract book of the first north american meeting of the american society of parasitology / - , 2007

Skup
First north american meeting of the american society of parasitology

Mjesto i datum
Mérida, Meksiko, 21.07.2008. - 25.07.2008

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Thunnus orientalis; Didymozoa

Sažetak
Atlantic (Thunnus thynnus) and Pacific bluefin tuna (Thunnus orientalis) are migratory marine teleosts that are declining in abundance due to overexploitation in the Atlantic and Mediterranean Sea. Recently, molecular and electronic tag data has shown that at least two populations exist in the North Atlantic and mix on foraging grounds in the North Atlantic. One population spawns in the Gulf of Mexico and the other spawns in the Mediterranean Sea. Ttuna also comprises the most valuable finfish aquaculture product currently recognized, with the production accounting for more than a half of the world total, concentrated in the Mediterranean Sea. While the use of parasites as natural tags is not a novel practice, it is mainly employed to assess stocks of fish taxa with high commercial value (hake, Atlantic cod, rockfish). In past studies, bluefin tuna parasite communities were assessed both in wild and reared fish, showing remarkable prevalence/ abundance of Didymozoidae (Trematoda, Digenea). They parasitize a wide number of tissues ; body surface, fins, mouth and gill cavity, visceral organs and kidney, and are able to elicit pathological effect in reared fish. Giving the wide geographical distribution of bluefin tuna and substantial efforts to distinguish between the stocks, we analyzed molecular variation in 63 Didymozoidae members using mitochondrial (COI) and genomic markers (28S rDNA and ITS). 44 specimens were collected from Atlantic bluefin tuna reared in Adriatic Sea pans, and 19 were sampled from Pacific bluefin tuna reared in the Gulf of Mexico. The aim of the study was to discern if the genetic diversity of Didymozoidae is correlated with the origin of the bluefin from the Mediterranean or Gulf of Mexico stock, in order to assess the usefulness of didymozoans as biological tags. In contrast with previous results on genetic diversity of digenea Cradicola forsteri and monogenean Hexostoma thynni from four tuna species, our results showed evidence in favor of genetic divergence between didymozoids from Gulf of Mexico and Adriatic Sea, respectively.

Izvorni jezik
Engleski

Znanstvena područja
Veterinarska medicina

POVEZANOST RADA