Distribution of anisakid nematodes parasitizing rajiform skates under commercial exploitation in the Southwestern Atlantic

Irigoitia, Manuel Marcial; Braicovich, Paola E.; Lanfranchi, Ana L.; Farber, Marisa Diana; Timi, Juan T.

doi:10.1016/j.ijfoodmicro.2017.12.009

Cited by 9 publications

(17 citation statements)

References 71 publications

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“…The year of capture also had certain relevance in determining mean abundance, indicating that some changes could have occurred in the region during recent decades; however, a reliable explanation to these variations would require additional studies, beyond the scope of the present work. Finally, and as observed for larval Anisakis in skates of the Argentine Sea [ 18 ], the geographical origin of the samples was the main determinant of prevalence and mean abundance of parasites. The environmental conditions in the study region are determined by the subtropical and sub-Antarctic currents flowing along the continental slope [ 75 ].…”

Section: Discussionmentioning

confidence: 57%

“…Anisakis typica is known to be restricted to subtropical and tropical waters, and is the most common species in Brazilian waters [ 56 ], whereas A. pegreffii displays a discontinuous distribution, being known from the Mediterranean Sea, the Central East Atlantic and waters of China and Japan in the Northern Hemisphere and displaying a circumpolar distribution in the Southern Hemisphere [ 4 , 24 , 59 ]. Anisakis pegreffii is also the most reported species in the southern Argentine Sea, dominated by sub-Antarctic waters where 121 of 122 previously genetically identified worms were assigned to this species and only one to A. berlandi [ 18 , 60 , 61 ]. Therefore, A. typica and A. pegreffii can be considered as representatives of northern and southern regions of the South-West Atlantic, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…). The only published reports of genetically identified species of Anisakis are that of Anisakis pegreffii in Merluccius hubbsi [ 4 ] and the skates Sympterygia bonapartii and Zearaja chilensis [ 18 ], and that of a single specimen of Anisakis berlandi in S. bonapartii [ 18 ], highlighting the considerable uncertainty existing in the species composition of this genus in this region. Adult Anisakis have been also reported in several species of cetaceans in the Argentine Sea [ 19 ], all of them based on morphological identifications, and most reported as Anisakis sp.…”

Section: Introductionmentioning

confidence: 99%

“…Prevalence and mean abundance of larval Anisakis in the Argentine Sea, presumed to be mostly A. pegreffii , follow a latitudinal pattern increasing southwards irrespective of the host species harbouring them [ 9 , 18 ]. The locality of capture of Z. conchifer in the ecotonal region also provided the opportunity for evaluating whether population attributes of larval anisakids follow a general distribution pattern across fish species with a similar trophic level in the region, or if they depart from it.…”

Section: Introductionmentioning

confidence: 99%

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Influence of confluent marine currents in an ecotonal region of the South-West Atlantic on the distribution of larval anisakids (Nematoda: Anisakidae)

et al. 2018

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BackgroundIn the marine environment, transitional zones between major water masses harbour high biodiversity, mostly due to their productivity and by containing representatives of species characteristic of adjacent communities. With the aim of assessing the value of larval Anisakis as zoogeographical indicators in a transitional zone between subtropical and sub-Antarctic marine currents, larvae obtained from Zenopsis conchifer were genetically identified. Larvae from Pagrus pagrus and Merluccius hubbsi from two adjacent zoogeographical provinces were also sequenced.ResultsFour species were genetically identified in the whole sample, including Anisakis typica, A. pegreffii, A. berlandi and a probably new species related to A. paggiae. Anisakis typica and A. pegreffii were identified as indicators of tropical/subtropical and sub-Antarctic waters, respectively, and their presence evidenced the transitional conditions of the region. Multivariate analyses on prevalence and mean abundance of Anisakis spp. of 18 samples represented by 9 fish species caught south of 35°S determined that host trophic level and locality of capture were the main drivers of the distribution of parasites across zoogeographical units in the South-West Atlantic.ConclusionsMost samples followed a clear zoogeographical pattern, but the sample of Z. conchifer, composed mostly of A. typica, was an exception. This finding suggests that population parameters of A. typica and A. pegreffii could differ enough to be considered as a surrogates of the identity of larvae parasitizing a given host population and, therefore, a step forward the validation of the use of larval Anisakis as biological indicators for studies on host zoogeography.Electronic supplementary materialThe online version of this article (10.1186/s13071-018-3119-7) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of confluent marine currents in an ecotonal region of the South-West Atlantic on the distribution of larval anisakids (Nematoda: Anisakidae)

et al. 2018

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“…Anisakid nematodes belonging to the Pseudoterranova decipiens species complex (also known as sealworms or codworms) mature and reproduce in the digestive tract of pinnipeds (LAUCKNER, 1985;DI AZEVEDO et al, 2017;IRIGOITIA et al, 2018). As far as it has been known, the life cycle of Pseudoterranova species also includes crustaceans as the first hosts, and fish as second hosts (SUKHDEO, 2012).…”

Section: Introductionmentioning

confidence: 99%

First record of Pseudoterranova decipiens (Nematoda, Anisakidae) infecting the Red spot emperor Lethrinus lentjan in the Red Sea

Quraishy

Abdel‐Gaber

Dkhil

2019

Rev. Bras. Parasitol. Vet.

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The current parasitological study was carried out to investigate helminth parasites infecting the Red spot emperor Lethrinus lentjan inhabiting Hurghada City at the Gulf of Suez, Red Sea, Egypt. Third-stage larvae of nematode parasite was isolated from the intestine as well as body cavity of the examined fish. Light and scanning electron microscopy revealed that this parasite belonged to Anisakidae family within the genus Pseudoterranova. The present species is named Pseudoterranova decipiens based on the presence of triangular mouth aperture with prominent boring teeth and soft swellings of the cuticle, long muscular esophagus, ventrally excretory pore, and narrow transverse slit of anal opening followed by a short mucron. The morphological characteristics of this species were confirmed by molecular analysis of 18S rDNA gene region of the present parasite. It demonstrated a close identity ≥89% with taxa under family Anisakidae, 85% with Raphidascarididae, and 79-84% with Toxocaridae. A preliminary genetic comparison between gene sequence of the present parasite and other oxyurid species placeed it as a putative sister taxon to other Pseudoterranova decipiens described previously. This study demonstrated that the 18S rDNA gene region of Pseudoterranova decipiens yielded a unique sequence that confirmed its taxonomic position in Anisakidae.

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Parasites as tags for stock identification of a highly exploited vulnerable skate Dipturus brevicaudatus (Chondrichthyes: Rajidae) in the south‐western Atlantic Ocean, a complementary tool for its conservation

Irigoitia

Levy

Canel

et al. 2022

Aquatic Conservation

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1. Populations of chondrichthyans are particularly sensitive to elevated fishing mortality due to their low reproductive potential and very low population growth.2. Dipturus brevicaudatus is a common and endemic skate from waters of Argentina and is frequently caught as by-catch and is therefore extremely vulnerable to commercial fishing. There are signs of overfishing in both the northern and southern Argentine Sea and the species has been classified as 'Vulnerable' by the International Union for Conservation of Nature. 3. A parasitological examination of 96 skates revealed 1,913 individual macroparasites belonging to 18 species and one myxozoan. Three parasite species were long-lived and were suitable biological tags, resulting in statistically significant differences between North Patagonic and both Buenos Aires and South Patagonic regions and therefore can be used to identify stocks of D. brevicaudatus. The inclusion of short-lived parasites in the analyses suggested the existence of three stocks. 4. Parasite assemblages from the northern Argentine Sea (Buenos Aires, Argentine biogeographical province) and from Patagonian waters (North and South Patagonic, Magellanic biogeographical province) varied in terms of parasite infracommunity species richness and the relative abundance of parasite guilds.5. Using parasites to infer the existence of three stocks of D. brevicaudatus provides the basis to help establishing management and recovery strategies to preserve the diversity of this vulnerable skate in the south-west Atlantic Ocean.6. Due to the low host specificity of the long-lived parasite tags, there is potential to extend this methodology to other skate species that are commercially exploited in the region, whose population structures remain unknown.

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Distribution of anisakid nematodes parasitizing rajiform skates under commercial exploitation in the Southwestern Atlantic

Cited by 9 publications

References 71 publications

Influence of confluent marine currents in an ecotonal region of the South-West Atlantic on the distribution of larval anisakids (Nematoda: Anisakidae)

Influence of confluent marine currents in an ecotonal region of the South-West Atlantic on the distribution of larval anisakids (Nematoda: Anisakidae)

First record of Pseudoterranova decipiens (Nematoda, Anisakidae) infecting the Red spot emperor Lethrinus lentjan in the Red Sea

Parasites as tags for stock identification of a highly exploited vulnerable skate Dipturus brevicaudatus (Chondrichthyes: Rajidae) in the south‐western Atlantic Ocean, a complementary tool for its conservation

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