The effect of the isopod parasite Ceratothoa gaudichaudii on the body weight of farmed Salmo salar in southern Chile

Sievers, G; Lobos, Carlos; Inostroza, Ricardo; Ernst, S.A.

doi:10.1016/0044-8486(96)01262-8

Cited by 33 publications

(29 citation statements)

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“…CharfiCheikhrouha et al 2000, Matašin & Vu<inić 2008, Mladineo et al 2009), cymothoids frequently occur at prevalences below 25%. In contrast, prevalences in fish farms have been reported to exceed 50% and approach 100% (Sievers et al 1996, Horton & Okamura 2001, Mladineo 2002.…”

Section: Discussionmentioning

confidence: 99%

Benign effect of the fish parasitic isopod Ceratothoa cf. imbricata on Selenotoca multifasciata (Scatophagidae) from Australia

Carrassón

Cribb²

2014

Dis. Aquat. Org.

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The tongue-biter cymothoid isopod Ceratothoa cf. imbricata is nearly ubiquitous in buccal cavities of the banded scat Selenotoca multifasciata (Scatophagidae) from Waterloo Bay, south-east Queensland. To test whether infestation affects fish growth or condition significantly, we explored parasitism and condition in 122 S. multifasciata specimens. The internal area of the buccal cavity and that occupied by ovigerous female isopods were measured, allowing the relative proportion of free internal area of the buccal cavity (PFIAO) to be calculated. Of 122 fish, 119 (97.5%) were infected; 35.3% had large female isopods, the remaining infections comprised much smaller mancae, juveniles and adult males. Mean intensity of infection was significantly correlated with fish total length (TL). In some fish, the female isopod occupied up to 80% of the buccal cavity area. There was little evidence of attachment damage in the buccal cavity; only 9 of 43 hosts analysed had restricted damage to the tissues at the points of attachment of the female isopod. Condition factor, food intensity index and stomach weight did not differ between fish with and without female C. cf. imbricata. The relative proportion of free internal area of the buccal cavity with respect to the fish total length (PFIAO/TL 2 ratio) of fish infected with females correlated with food intensity and condition factor. Although the correlation was significant, the actual effect was not large because more than 70% of these 2 indices was not explained by the PFIAO/TL 2 ratio (r 2 < 0.3 in both cases). Despite the dramatic appearance of infestations and the high prevalence of C. cf. imbricata in the population, the near-absence of pathological alterations and the limited effect of the isopod on the condition indices and food intensity suggest that this isopod is relatively benign for S. multifasciata. KEY WORDS: Ceratothoa cf. imbricata · Oral ectoparasite · Selenotoca multifasciata · Asymptomatic infection Resale or republication not permitted without written consent of the publisherDis Aquat Org 110: [173][174][175][176][177][178][179][180] 2014 musculature of fishes. Most are highly site specific (Bunkley-Williams & Williams 1998). Females are always much larger than the males on an individual host.There are reports of various pathologies caused by cymothoids including tissue damage, growth defects, decrease in mean host weight and size, depressed fecundity and increased mortalities (Adlard & Lester 1994, 1995, Horton & Okamura 2001, Rajkumar et al. 2005, Ravi & Rajkumar 2007, Fogelman & Grutter 2008. In contrast, some studies have failed to find such serious effects of infection as those listed above (e.g. Ruiz & Madrid 1992, Landau et al. 1995, Bakenhaster et al. 2006. Species of the genus Ceratothoa affect both wild and cultured fish populations. These parasites may significantly depress growth or other parameters in both wild and cage-reared fishes (Šarušic 1999, Papapanagiotou & Trilles 2001, Mladineo 2002, Horton & Okamura 2003.Scats (family Sca...

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Section: Discussionmentioning

confidence: 99%

Benign effect of the fish parasitic isopod Ceratothoa cf. imbricata on Selenotoca multifasciata (Scatophagidae) from Australia

Carrassón

Cribb²

2014

Dis. Aquat. Org.

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“…Nerocila phaeopleura, is being host specific, would thus seem to fit in with an apparently generic characteristic and it seems reasonable to assume that Sardinella gibbosa is the major host of this species in the South China sea. There was an increase in the prevalence of the parasitosis from 33.4% to 98.2%; concurrently, the total number of parasites on salmon rose from 309 to 3 987 with an increase of infestation intensity from 1.4 to 6.1 parasites per fish [28] . In Parangipettai coast the highest percentage of infestation occurred in January and the lowest in July [29] .…”

Section: Discussionmentioning

confidence: 96%

Invasion of parasitic isopods in marine fishes

2013

JCLM

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“…Ακολούθησαν και άλλες δημοσιεύσεις όσον αφο ρά στις μολύνσεις από τα ισόποδα παράσιτα της οι κογένειας Cymothoidae, όπως παρασίτωση από το ι-οόποδο Ceratothoa gaudichaudii σε εκτροφές οολο-μοΰ (Salmon salar) στη Χιλή (Alvarado et al, 1990, Roa, 1992, Inostroza et al, 1993, Sievers et al, 1996. Στην περίπτωση αυτή παρατηρήθηκε μείωση του βά ρους των ψαριών, που φιλοξενούσαν περισσότερα α πό 8 παράσιτα, σε σχέση με εκείνα τα ψάρια που πε ριείχαν 3-8 ή λιγότερα από 3 παράσιτα.…”

Section: συζητησηunclassified

“…Στην περίπτωση αυτή παρατηρήθηκε μείωση του βά ρους των ψαριών, που φιλοξενούσαν περισσότερα α πό 8 παράσιτα, σε σχέση με εκείνα τα ψάρια που πε ριείχαν 3-8 ή λιγότερα από 3 παράσιτα. Τα παράσιτα δεν βρέθηκαν σε άγριους ή εκτρεφόμενους οολομονς στο Βόρειο ημισφαίριο, αλλά στη Χιλή παρατηρήθη καν στο είδος Trachurus murphyi, το οποίο βρέθηκε γΰρω από τους κλωβούς των εκτρεφόμενων οολομών τους καλοκαιρινούς μήνες (Sievers et al, 1996). Στην Ελλάδα παρατηρήθηκαν παρασιτώσεις από το παράσιτο Emetha audouini σε εκτροφές λαβρακιών (Papapanagiotou et al, 1999).…”

Section: συζητησηunclassified

Study of the biological cycle of the isopod Ceratothoa oestroides, Risso, 1836 in sea bream (Sparus aurata) and sea bass (Dicentrarchus labrax)

Vagianou

Bitchava

Yagnisi

et al. 2017

J Hellenic Vet Med Soc

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Study of the biological cycle of the isopodABSTRACT. The aim of the present study was the investigation of the biological cycle of the isopod parasite Ceratothoa oestroides (Risso, 1836), the way of installation in the host and the study of its pathology in young individuals of gilthead sea bream {Sparus aurata) and sea bass {Dicentrarchus labrax) raised in experimental aquariums. During the experiment, initially, 10 sea bass of marketable size (300-400gr) were collected infected with lice from the region of Chios and Epidavros. The lice were mature and gravid. The adults and their hosts were kept in 151t aquariums, with constant water of 32-33%c salinity at temperature of 21-22° C, until they would give both to young parasites. The time that parasites stayed in aquarium was three months. After three months, new hatched larvae appeared. The pulii II stage, which was responsible for the most alterations that were observed in the fish and particular in sea bass, were observed in the first week, after the hatching. In this stage, parasites swam freely in the surface of water column. At this phase, 100 parasites were transported in 2 different aquariums with the same conditions of salinity and temperature as in the first aquarium, where young uninfected individuals (3-5 gr) of gilthead sea bream {Sparus aurata) and sea bass {Dicentrarchus labrax) were placed. The number of the uninfected, healthy fish was 40 individuals per aquarium. During the duration of experiment four weekly samplings of five individuals per sample were performed and these underwent a macroscopical, parasitological and histopathological examination. In addition, the mortalities that existed and the final luck of parasites afterwards the death of their hosts were recorded. From the results, we concluded that pulii II stage caused serious lesions and eventually the death of mainly young fish, gilthead sea bream {Sparus aurata) and sea bass {Dicentrarchus labrax). The process from the moment of "invasion" of young parasites until their final installation in the buccal cavity lasted around 2 hours. In one week, all the isopods were installed in the buccal cavity of young gilthead sea bream {Sparus aurata) and sea bass {Dicentrarchus labrax). During the second week, the first symptoms of fish appeared. The infected fish swam fast and rubbed their body against the aquarium surface in order to remove the parasites. In the sea bass {Dicentrarchus labrax), with the appearance of first symptoms, the biggest rate of mortality (56,25%) followed, while in the gilthead sea bream {Sparus aurata), the biggest rate of mortality (52%) was observed in the third week. With regard to the luck of the young parasites that remained without host it was observed that they swam for 48 hours, then fell in the bottom of aquarium and after 24 hours the first mortalities started. The adult parasites, that gave the young pulii II after 24 hours, were dead in the bottom of aquarium.

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The effect of the isopod parasite Ceratothoa gaudichaudii on the body weight of farmed Salmo salar in southern Chile

Cited by 33 publications

References 3 publications

Benign effect of the fish parasitic isopod Ceratothoa cf. imbricata on Selenotoca multifasciata (Scatophagidae) from Australia

Benign effect of the fish parasitic isopod Ceratothoa cf. imbricata on Selenotoca multifasciata (Scatophagidae) from Australia

Invasion of parasitic isopods in marine fishes

Study of the biological cycle of the isopod Ceratothoa oestroides, Risso, 1836 in sea bream (Sparus aurata) and sea bass (Dicentrarchus labrax)

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