Topic
Monogenea
About: Monogenea is a research topic. Over the lifetime, 1290 publications have been published within this topic receiving 14502 citations. The topic is also known as: monogenean.
Papers published on a yearly basis
1 / 2
Papers
TL;DR: Justine et al. as discussed by the authors identified nine species among 1500 monogeneans collected on the gills of 17 speckled blue groupers, Epinephelus cyanopodus, caught off New Caledonia, South Pacific.
Abstract: Nine species were identified among 1500 monogeneans collected on the gills of 17 speckled blue groupers, Epinephelus cyanopodus, caught off New Caledonia, South Pacific. A new method for describing squamodiscs in tables is proposed. Diplectanids included one new species of Laticola, which was the most abundant species, and six species of Pseudorhabdosynochus, including four new species, which were differentiated mainly on the basis of morphology of the sclerotised vagina. Laticola cyanus n. sp. is characterised by its genital organs. Pseudorhabdosynochus cyanopodus n. sp. and P. podocyanus n. sp. both have a vagina with a large primary chamber. Pseudorhabdosynochus chauveti n. sp. has a vagina with a long, coiled primary canal. Pseudorhabdosynochus exoticus n. sp. has an aberrant discoid vagina and characters (tip of quadriloculate organ, lateral bar with hook), which differentiate it from all other species. The fivepreviously cited species are strictly specific to E. cyanopodus and were abundant in large (>585 mm) fish. In addition, Haliotrema sp. (Ancyrocephalidae) and Allobenedenia sp. (Capsalidae), both undescribed, were also found on large fish. Pseudorhabdosynochus duitoe Justine, 2007 and P. huitoe Justine, 2007, were collected in very small numbers, mainly in young (345–500 mm) fish; the type-host of these two species is the highfin grouper, E. maculatus, and their occurrence on E. cyanopodus was considered accidental and due to habitat overlap between the young speckled blue groupers and adult highfin groupers. It is hypothesized that the speckled blue groupers are infested by their own, strictly specific monogeneans, only when they encounter older members of their species during spawning aggregations. Spawning aggregations thus play a key role in infestation of coral reef fish by their monoxenic parasites such as monogeneans. Lists are given for other parasites of the speckled blue grouper, including digeneans, cestodes, nematodes, isopods and copepods, with new records from New Caledonia: 41 species of parasites are recorded.
31 citations
TL;DR: By means of light, scanning and transmission electron microscopy (TEM), it was clearly demonstrated that toltrazuril caused damage to the tegument of Dactylogyrus species and P. bini, and fish with extensive skin lesions should carefully be observed during treatment, because this factor decreases their drug tolerance.
Abstract: Sym. triazinone (toltrazuril, Code No Bay Vi 9142), which has been shown to be an anticoccidial drug (Haberkorn 1986; Haberkorn and Stoltefuss 1987; Haberkorn etal. 1983; Mehlhorn etal. 1984), is also effective against Monogenea parasitizing the gills or external surface of fish. Naturally infected carps, breams, roaches, eels, and threespined sticklebacks parasitized by Dactylogyrus vastator, D. extensus, D. cornu, Diplozoon homoion, Pseudodactylogyrus bini, and Gyrodactylus arcuatus were incubated in water containing 0.5, 10, 20, 30, or 50 gg toltrazuril/ml for 0.3, 1, 2, 3, and 4 h. The pure solvent (4 ml/1000 ml water) had no effect on either the fish or parasites. Toltrazuril caused irreversible damage to the tegument of Dactylogyrus species and P. bini, beginning at a dose of 5 gg/ml and 4 h exposure. In vitro treatment with toltrazuril causes death in D. paradoxurn (host=chub) and D. homoion after 4-80 min (10 ~tg/ml), depending on the age of the parasites. Specimens of G. arcuatus were severely affected after treatment with 20 gg/ml for 1 h. In all species, the teguments of the prohaptor and peduncle showed marked vacuolization and disruptions. We recommend that infections in Gyrodactylus and Dactylogyrus species and P. bini be treated using a water bath with 10 gg toltrazuril/ml for 4 h at 20~ (breams and roaches: 15 ~ C) under good aeration. Fish with extensive skin lesions (due to other infections) should carefully be observed during treatment, because this factor decreases their drug tolerance. By means of light, scanning (SEM) and transmission electron microscopy (TEM), it was clearly demonstrated that toltrazuril caused damage to
31 citations
TL;DR: In this article, the authors described three new species of monogenean parasites of characid fishes from the Upper Parana River basin, Brazil: Characithecium paranapanemense n. sp.
30 citations
TL;DR: During August 1960 and April 1961, a number of living specimens of Entobdella soleae were recovered from the blind (= 'ventral ') surfaces of common sole caught at Plymouth, and a characteristic undulating movement of the flattened leaf-like body was noticed in all individuals examined.
Abstract: During August 1960 and April 1961, a number of living specimens of Entobdella soleae (van Beneden & Hesse, I863)J ohnston, 1929, were recovered from the blind (= 'ventral ') surfaces of common sole (Solea solea L.) caught at Plymouth. A characteristic undulating movement of the flattened leaf-like body was noticed in all individuals examined. No previous record of this movement is available for Entobdella soleae, but in E. squamula from the bastard halibut (Paralichthys californicus) of the Pacific, Heath (1902) noted very briefly that body undulations occurred, while both extremities of the animal were attached, and that these movements probably aided the process of respiration. Heath, however, produced no evidence to support his suggestion, and the purpose of the present work is to investigate the nature and function of the undulating movements.
30 citations
1 Jan 1964
30 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2025 | 23 |
| 2024 | 52 |
| 2023 | 53 |
| 2022 | 129 |
| 2021 | 39 |
| 2020 | 29 |