Blood Fluke Infection of Cage Reared Atlantic Bluefin Tuna Thunnus thynnus in West Mediterranean

Ybáñez, R. Ruiz de; Peñalver, J.; Martínez‐Carrasco, Carlos; Rı́o, Laura Del; Dolores, E. María; Berriatua, E.; Muñoz, Pilar

doi:10.3147/jsfp.46.87

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…Parasitological studies on the Atlantic bluefin tuna and other bluefin tunas, i.e. the southern bluefin tuna, Thunnus maccoyii (castelnau), and the Pacific bluefin tuna, Thunnus orientalis (temminck et schlegel), deal mainly with taxonomy (Ariola 1902(Ariola , ishii 1935(Ariola , cressey and cressey 1980, the effects of parasitic infections in cage-reared fish (Mladineo et al 2008, ruiz de Ybañez et al 2011, or the use of parasites as biological tags (MacKenzie 1983, rodríguez-Marín et al 2008, Mladineo et al 2010. the research on large tunas is hampered by the high value of fish; therefore, the studies on the use of parasites as tags consider mainly examination of gills, head and viscera, because of their limited (or null) commercial value (lardeaux 1982, lester et al 1985, Jones 1991, rodríguez-Marín et al 2008.…”

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confidence: 99%

Metazoan gill parasites of the Atlantic bluefin tuna Thunnus thynnus (Linnaeus) (Osteichthyes: Scombridae) from the Mediterranean and their possible use as biological tags

Culurgioni¹,

Mele²,

Merella³

et al. 2014

FOLIA PARASIT

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the gills of 63 specimens of the Atlantic bluefin tuna Thunnus thynnus (linnaeus) (osteichthyes: scombridae) from three localities of the Mediterranean (sardinian, tyrrhenian and levantine seas) were examined for metazoan parasites. the parasite fauna of T. thynnus from the sea of sardinia included 11 species: five didymozoid trematodes, three capsalid and one hexostomid monogeneans, and one caligid and one pseudocycnid copepods. Four didymozoids were found in fish from the levantine sea and only one didymozoid was recorded in fish from the tyrrhenian sea. Dividing the hosts into four size-groups (small, medium-sized, large and extra large), the pairwise comparison of prevalence and mean abundance of the new and literary data) showed differences according to host size. the differences in the composition of the parasitic faunas and in the prevalence of parasites, observed between the small tunas from the tyrrhenian sea and the medium-sized tunas from the Adriatic sea, levantine sea and the NorthEast (NE) Atlantic ocean, indicated that these groups form discrete units. the parasite fauna of the large tunas from the sea of sardinia is the richest among the bluefin tuna populations of the Mediterranean and the NE Atlantic, due to the presence of species not found elsewhere in bluefin tunas, such as Caligus coryphaenae steenstrup et lütken, 1861, Capsala magronum (ishii, 1936) and C. paucispinosa (Mamaev, 1968). this fact and the prevalence of some parasites of this group (lower than those of medium-sized fish from the NE Atlantic and higher than the small and medium-sized tunas from the Mediterranean) suggest that the large-sized tuna group in the western Mediterranean is formed by Mediterranean resident tunas (poorly infected), and by tunas migrating from the Atlantic ocean (heavily infected).

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mentioning

confidence: 99%

Metazoan gill parasites of the Atlantic bluefin tuna Thunnus thynnus (Linnaeus) (Osteichthyes: Scombridae) from the Mediterranean and their possible use as biological tags

Culurgioni¹,

Mele²,

Merella³

et al. 2014

FOLIA PARASIT

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“…require both an intermediate and definitive host. Free-living miracidia emerge from the egg and infect the intermediate host, a terebellid polychaete [14,15]. After maturation, free-living cercariae emerge and infect the definitive fish host [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…Free-living miracidia emerge from the egg and infect the intermediate host, a terebellid polychaete [14,15]. After maturation, free-living cercariae emerge and infect the definitive fish host [15,16]. After infection, adult C. forsteri colonise the heart of the host [17], while adult C. orientalis are present in the afferent branchial arteries of the gills [12,13,18,19].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Cardicola spp. Infection in Ranched Southern Bluefin Tuna: First Observation of C. orientalis at Transfer

Carabott,

Power,

Widdicombe

et al. 2023

Pathogens

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Aporocotylid blood flukes Cardicola forsteri and C. orientalis are an ongoing health concern for the Southern Bluefin Tuna (Thunnus maccoyii, SBT) industry, where infections can lead to morbidity and mortality in ranched SBT populations. This study compared blood fluke infection in SBT from two companies during the 2021 ranching season. Both companies administered the same dosage of praziquantel approximately 5 weeks after transfer, feeding with frozen baitfish daily; the only difference in the company’s practices was that the pontoons were located 2.5 km apart. Infection severity was measured as prevalence and intensity by quantifying adult C. forsteri in SBT heart and copy numbers of C. forsteri and C. orientalis ITS-2 DNA in SBT heart and gills. Data from the 2018 and 2019 harvests of SBT were used to make comparisons with 2021 harvest data. Cardicola orientalis was detected at transfer and no longer detected after treatment with praziquantel. Cardicola spp. were present in 83% of sampled SBT in 2021. Both companies demonstrated similar patterns of infection, and Company A had higher prevalence and intensity of Cardicola spp. infection. Based on C. forsteri ITS-2 DNA, infection intensity at harvest was significantly greater for both companies in 2021 when compared to 2018 and 2019. Continued monitoring of Cardicola spp. in SBT and improvements in diagnostics contribute to our understanding of Cardicola spp. epizootiology and the detection of changes in treatment efficacy.

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“…The lack of basic information on infectious diseases and their impacts on these species is surprising given that tunas are among the most economically valuable "blue water" bony fishes worldwide. With increasing production of tuna aquaculture operations, there has been a growing focus on parasitic diseases in cage‐reared fish (Mladineo, Šegvić, & Petrić, ; de Ybañez et al, ). In contrast, few studies have detailed the ecology of ectoparasitic infections on wild tunas other than on the skin and gills (Bullard, Womble, Maynard, Orélis‐Ribeiro, & Arias, ; Munday, Sawada, Cribb, & Hayward, ), and most studies treating tuna and billfish parasites have focused on the use of parasites as biological tags for stock discrimination or marking cryptic species (Barse & Bullard, ; Culurgioni et al, ; MacKenzie & Abaunza, ; Williams, MacKenzie, & McCarthy, ).…”

Section: Introductionmentioning

confidence: 99%

Prevalence, intensity and pathology of the nasal parasite Nasicola hogansi in Atlantic bluefin tuna (Thunnus thynnus)

Warshafsky

Bullard

Vogelbein

et al. 2020

Journal of Fish Diseases

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Ectoparasitic flatworms of Nasicola (Monogenoidea: Capsalidae), which infect nasal epithelium of true tunas (Thunnus spp.), are not well studied, nor have their impacts on the host's olfactory organ been evaluated. Infections of Nasicola hogansi on Atlantic bluefin tuna, Thunnus thynnus, were investigated with emphasis on the relationship between infection prevalence, abundance and mean intensity with bluefin tuna size, sex, body condition and capture month, as well as histopathological effects. Commercially caught Atlantic bluefin tuna (n = 161, 185–305 cm curved fork length) from the Gulf of Maine were sampled during June through August 2009 for infections by N. hogansi. A total of 247 specimens of N. hogansi were collected, with a prevalence of 45.3%, mean abundance of 1.57 (CI: 1.21–2.03) and mean intensity of 3.45 (CI: 2.91–4.22). Neither fish sex nor landing month had a significant effect on parasite parameters. Larger and better‐conditioned Atlantic bluefin tuna had a higher mean intensity of infection. Pathology associated with infection by N. hogansi included extensive necrosis, sloughing of the nasal epithelium and associated inflammation of underlying connective tissues. Further epidemiological and pathological study of this host–parasite system is warranted since impaired olfaction, if present, could adversely affect spawning and migration of this top ocean predator.

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Blood Fluke Infection of Cage Reared Atlantic Bluefin Tuna Thunnus thynnus in West Mediterranean

Cited by 10 publications

References 12 publications

Metazoan gill parasites of the Atlantic bluefin tuna Thunnus thynnus (Linnaeus) (Osteichthyes: Scombridae) from the Mediterranean and their possible use as biological tags

Metazoan gill parasites of the Atlantic bluefin tuna Thunnus thynnus (Linnaeus) (Osteichthyes: Scombridae) from the Mediterranean and their possible use as biological tags

Dynamics of Cardicola spp. Infection in Ranched Southern Bluefin Tuna: First Observation of C. orientalis at Transfer

Prevalence, intensity and pathology of the nasal parasite Nasicola hogansi in Atlantic bluefin tuna (Thunnus thynnus)

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