Effectiveness of treatments against eggs, and adults of Haliotrema sp. and Euryhaliotrema sp. (Monogenea: Ancyrocephalinae) infecting red snapper, Lutjanus guttatus

Fájer-Ávila, Emma Josefina; Velásquez-Medina, S.P.; Betancourt‐Lozano, Miguel

doi:10.1016/j.aquaculture.2006.12.035

Cited by 39 publications

(27 citation statements)

References 21 publications

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“…On the other hand, the spotted rose snapper Lutjanus guttatus (Steindachner) is an important potential fish species for aquaculture in Mexico which is commonly infected by a high number of dactylogyrids that can cause a severe proliferative epithelial response, lamellar fusion, asphyxia and anorexia (10,11). Monogeneans in high level of parasitic infection cause changes in the blood parameters of the fish and induce a cellular immune response (11–13).…”

Section: Introductionmentioning

confidence: 99%

Influence of β‐glucan on innate immunity and resistance of Lutjanus guttatus to an experimental infection of dactylogyrid monogeneans

Río-Zaragoza

Fájer-Ávila

Almazán-Rueda

2011

Parasite Immunology

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The present study investigated the effect of β-1,3/1,6-glucan on growth, haematology, innate immunity and resistance against dactylogyrids on the spotted rose snapper (Lutjanus guttatus). Fish were fed during 5 weeks with commercial diet (control group) and same diet supplemented with three levels of β-glucans (0·05%, 0·1% and 0·5%/kg feed). The results showed that at concentrations of 0·05% and 0·1%, fish growth was enhanced, and in weeks 2 and 4, an increase in cellular responses such as percentage of monocytes, neutrophils, respiratory burst activity and nitric oxide activity was observed. In diet with 0·5%β-glucans, changes were registered at the end of the experiment. At week 2, 0·05%β-glucans showed the best response to most of the analysed parameters. In a second trial, diet with 0·05%β-glucans was chosen to prove its effect on the resistance of infected fish with monogeneans. The results showed that fish reduce significantly the number of dactylogyrids, and parameters such as WBC, percentage of lymphocytes, neutrophils and eosinophils were increased. In addition, WBC and percentage of thrombocytes increased in the control (+). The β-glucans have the potential to be use in diet formulations of the spotted rose snapper and to limit the adverse effects of dactylogyrids.

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Section: Introductionmentioning

confidence: 99%

Influence of β‐glucan on innate immunity and resistance of Lutjanus guttatus to an experimental infection of dactylogyrid monogeneans

Río-Zaragoza

Fájer-Ávila

Almazán-Rueda

2011

Parasite Immunology

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“…and Euryhaliotrema sp. decreased 30% by applying praziquantel baths (4.5 g L −1 , 14–24 h) to Lutjanus guttatus (Fajer‐Ávila, Velásquez‐Medina & Betancourt‐Lozano ). Ideally, the treatment should be delivered at the most appropriate time to interrupt the parasite's life cycle, killing worms hatched from eggs not killed by previous treatments before they mature and produce more eggs (Tubbs et al .…”

Section: Discussionmentioning

confidence: 99%

Diphasic sedimentation technique complemented by a statistical approach as a useful tool to the quantification and the determination of dynamics of eggs produced by adult monogenean parasitizing groupers,Epinephelus marginatus(Lowe, 1834), in captivity

et al. 2014

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Diphasic sedimentation technique complemented by a statistical approach as a useful tool to the quantification and the determination of dynamics of eggs produced by adult monogenean parasitizing groupers, Epinephelus marginatus (Lowe, 1834), in captivity Abstract Monogenean parasites create problems in confined fish, such as at aquaculture and aquariums facilities. Strategic timing of antihelminthic treatments should be based on the dynamics of monogenean egg production which requires egg quantification, but there is no standardized analytical method. The WHO diphasic sedimentation method for helminth quantification of eggs was applied in samples with tetrahedral and fusiform monogenean eggs from six specimens of confined groupers (Epinephelus marginatus) (31 m 3 sea water tank; water temperature 21.1-14.4°C; photoperiod 9:53-15 h light; November 2011 to June 2012). Helminth eggs remain in the pellet, while most organic matter was removed forming a cap. In contrast, monogenean eggs are distributed within both the pellet and cap. The diphasic sedimentation method is suitable to quantify tetrahedral and total egg number by counting those eggs in the pellet and incorporing water temperature data to obtain a statistically significant model expression (R 2 = 0.943; R 2 = 0.809), while this approach only weakly predicted fusiform egg numbers (R 2 = 0.297). Fusiform egg numbers declined along November-December, and increased in FebruaryMarch, until June. Tetrahedral eggs decreased in November-December, but did not increase until March. The trend of egg populations and best time for antihelminthic treatment application can be set by WHO technique with the statistical approach proposed.

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“…Clearly, the lutjanids harbour an impressive ancyrocephalid radiation, with probably several species on each fish species; some of these species seem to be strictly species-specific, others are found on up to 5 different host species [45]. These ancyrocephalids might be a threat for cultured snappers [46]. …”

Section: Discussionmentioning

confidence: 99%

An annotated list of fish parasites (Isopoda, Copepoda, Monogenea, Digenea, Cestoda, Nematoda) collected from Snappers and Bream (Lutjanidae, Nemipteridae, Caesionidae) in New Caledonia confirms high parasite biodiversity on coral reef fish

et al. 2012

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BackgroundCoral reefs are areas of maximum biodiversity, but the parasites of coral reef fishes, and especially their species richness, are not well known. Over an 8-year period, parasites were collected from 24 species of Lutjanidae, Nemipteridae and Caesionidae off New Caledonia, South Pacific.ResultsHost-parasite and parasite-host lists are provided, with a total of 207 host-parasite combinations and 58 parasite species identified at the species level, with 27 new host records. Results are presented for isopods, copepods, monogeneans, digeneans, cestodes and nematodes. When results are restricted to well-sampled reef fish species (sample size > 30), the number of host-parasite combinations is 20–25 per fish species, and the number of parasites identified at the species level is 9–13 per fish species. Lutjanids include reef-associated fish and deeper sea fish from the outer slopes of the coral reef: fish from both milieus were compared. Surprisingly, parasite biodiversity was higher in deeper sea fish than in reef fish (host-parasite combinations: 12.50 vs 10.13, number of species per fish 3.75 vs 3.00); however, we identified four biases which diminish the validity of this comparison. Finally, these results and previously published results allow us to propose a generalization of parasite biodiversity for four major families of reef-associated fishes (Lutjanidae, Nemipteridae, Serranidae and Lethrinidae): well-sampled fish have a mean of 20 host-parasite combinations per fish species, and the number of parasites identified at the species level is 10 per fish species.ConclusionsSince all precautions have been taken to minimize taxon numbers, it is safe to affirm than the number of fish parasites is at least ten times the number of fish species in coral reefs, for species of similar size or larger than the species in the four families studied; this is a major improvement to our estimate of biodiversity in coral reefs. Our results suggest that extinction of a coral reef fish species would eventually result in the coextinction of at least ten species of parasites.

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Effectiveness of treatments against eggs, and adults of Haliotrema sp. and Euryhaliotrema sp. (Monogenea: Ancyrocephalinae) infecting red snapper, Lutjanus guttatus

Cited by 39 publications

References 21 publications

Influence of β‐glucan on innate immunity and resistance of Lutjanus guttatus to an experimental infection of dactylogyrid monogeneans

Influence of β‐glucan on innate immunity and resistance of Lutjanus guttatus to an experimental infection of dactylogyrid monogeneans

Diphasic sedimentation technique complemented by a statistical approach as a useful tool to the quantification and the determination of dynamics of eggs produced by adult monogenean parasitizing groupers,Epinephelus marginatus(Lowe, 1834), in captivity

An annotated list of fish parasites (Isopoda, Copepoda, Monogenea, Digenea, Cestoda, Nematoda) collected from Snappers and Bream (Lutjanidae, Nemipteridae, Caesionidae) in New Caledonia confirms high parasite biodiversity on coral reef fish

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