Studies on Host Reactions to Larval Parasites. I. The Effect on Weight

Huntér, George W.; Hunter, Wanda Sanborn

doi:10.2307/3272273

Cited by 24 publications

(18 citation statements)

References 4 publications

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“…and Philometra sp.1 were also chosen, although these parasites have not been reported previously to be pathogenic in aquaculture. However, endoparasite infections can have negative effects on fish health (Hoffman, ; Hunter & Hunter, ; Moravec & de Buron, ; Thompson, ) and the digeneans Allopodocotyle sp. and Prosorhynchus sp.…”

Section: Discussionmentioning

confidence: 99%

“…(4-5) Prevalence of Trichodina sp. because it has been used to estimate bacterial biomass in polluted waters Ogut & Palm, 2005;Palm et al, 2011) and Cryptocaryon irritans as it has been documented as an indicator for stress and polluted environments (Diamant et al, 1999;Overstreet, 1993 (Hoffman, 1956;Hunter & Hunter, 1938;Moravec & de Buron, 2013;Thompson, 1983) and the digeneans Allopodocotyle sp. and Prosorhynchus sp.…”

Section: Selection Of Indicator Species and Parametersmentioning

confidence: 99%

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Assessment ofEpinephelus coioides(Hamilton, 1822) aquaculture systems in the Gulf of Tonkin, Vietnam, by using fish parasites

et al. 2017

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Summary The parasite fauna of Epinephelus coioides can be used as an indicator to assess different aquaculture systems. A total of 133 E. coioides were collected from fishermen (wild fish) and marine fish farms (net cages, pond farms) in the Gulf of Tonkin (Ha Long, Cat Ba and Nghia Hung), Vietnam in 2013 and 2014, and examined for the presence of protozoan and metazoan parasites. Different patterns of parasite infections were found. The monogenean Pseudorhabdosynochus spp. was predominant in the net cage system; and the protozoans Trichodina spp. and Cryptocaryon irritans were found exclusively in pond and net cage cultivation sites in Nghia Hung and Cat Ba. These three species were assessed in addition to seven further indicator species and two dominance indices, to visualize the potential of assessing different aquaculture systems in Vietnam. This suggests the use of former shrimp ponds for grouper cultivation, reducing the pressure to further extend net cage cultivation in already highly influenced mariculture regions in Vietnam.

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Section: Discussionmentioning

confidence: 99%

Section: Selection Of Indicator Species and Parametersmentioning

confidence: 99%

Assessment ofEpinephelus coioides(Hamilton, 1822) aquaculture systems in the Gulf of Tonkin, Vietnam, by using fish parasites

et al. 2017

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“…Table 2 provides a summary of the body condition parameters as well as the mean number of blackspots on each fish. Blackspot disease is commonly observed in freshwater fish as pinhead sized spots located on the fins and body of infected fish [21], [27]. It is caused by a trematode parasite ( Ornithodiplostomum sp .)…”

Section: Methodsmentioning

confidence: 99%

Within and between Population Variation in Epidermal Club Cell Investment in a Freshwater Prey Fish: A Cautionary Tale for Evolutionary Ecologists

et al. 2013

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Many prey fishes possess large club cells in their epidermis. The role of these cells has garnered considerable attention from evolutionary ecologists. These cells likely form part of the innate immune system of fishes, however, they also have an alarm function, releasing chemical cues that serve to warn nearby conspecifics of danger. Experiments aimed at understanding the selection pressures leading to the evolution of these cells have been hampered by a surprisingly large intraspecific variation in epidermal club cell (ECC) investment. The goal of our current work was to explore the magnitude and nature of this variation in ECC investment. In a field survey, we documented large differences in ECC investment both within and between several populations of minnows. We then tested whether we could experimentally reduce variation in mean ECC number by raising fish under standard laboratory conditions for 4 weeks. Fish from different populations responded very differently to being held under standard laboratory conditions; some populations showed an increase in ECC investment while others remained unchanged. More importantly, we found some evidence that we could reduce within population variation in ECC investment through time, but could not reduce among-population variation in mean ECC investment. Given the large variation we observed in wild fish and our limited ability to converge mean cell number by holding the fish under standard conditions, we caution that future studies may be hard pressed to find subtle effects of various experimental manipulations; this will make elucidating the selection pressures leading to the evolution of the cells challenging.

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“…Hoffman 1956, Lemly & Esch 1984 or reduce the growth and body condition of some species (e.g. Hunter & Hunter 1938, Lemly & Esch 1984. Black spot condition among wild fish is usually considered relatively benign (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…In the laboratory, heavy infections have been shown to be fatal or to reduce growth in some cases (Hunter & Hunter 1938, Hoffman 1956, Lemly & Esch 1984. In natural systems, results are more variable with some studies showing deleterious effects from heavy infections by black spot agents (Harrison & Hadley 1982, Lemly & Esch 1984, whereas others show little or no effect from the parasite (e.g.…”

Section: Introductionmentioning

confidence: 96%

Infection by a black spot-causing species of Uvulifer and associated opercular alterations in fishes from a high-desert stream in Wyoming

Quist

Bower²,

Hubert³

2007

Dis. Aquat. Org.

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Black spot is a common disease syndrome of freshwater fishes. This study provides information on the rank of density of the black spot agent and opercular bone alterations associated with at least one digenean, Uvulifer sp., infecting native and non-native catostomids and cyprinids of the Upper Colorado River Basin. We evaluated the density rank of pigmented metacercariae and associated alterations in the operculum of the bluehead sucker Catostomus discobolus, flannelmouth sucker C. latipinnis, white sucker C. commersoni, catostomid hybrids, roundtail chub Gila robusta, and creek chub Semotilus atromaculatus, sampled from Muddy Creek, Wyoming, USA in 2003 or 2004. All fish species contained individuals that exhibited gross signs of the black spot agent. Bluehead and flannelmouth suckers had 100% prevalence of infection. Although the other suckers and chubs contained encysted metacercariae in at least one individual, the presence of pigmented metacercariae was not apparent (i.e. based on gross observations) in many individuals. Catostomids had higher densities of metacercariae than cyprinids, as shown by frequency distributions of density ranks. Opercular holes (i.e. holes that completely penetrated the opercle and were in direct association with the pigment associated metacercariae) and pockets (depressions on the external surface of the opercle associated with metacercariae) were abundant among catostomids but rare among cyprinids.KEY WORDS: Black spot disease · Uvulifer sp. · Opercular lesions · Colorado River · Native fish Resale or republication not permitted without written consent of the publisherDis Aquat Org 78: [129][130][131][132][133][134][135][136] 2007 mediate host snail and transforms into sporocysts, which in turn produce free-swimming cercariae. Infection occurs when a fish encounters cercariae that penetrate its integument and develop into encysted metacercariae, and the worm undergoes development in the fish before it will mature in the appropriate avian final host. Encysted metacercariae of some species can survive more than 4.5 yr in a fish (Hoffman & Putz 1965). The characteristic black spot is the result of the fish forming a capsule of connective tissue containing melanophores around the encysted metacercaria (Davis 1967, Berra & Au 1978.Many researchers have investigated the effects of encysted metacercariae on fishes, but results have been inconsistent. In the laboratory, heavy infections have been shown to be fatal or to reduce growth in some cases (Hunter & Hunter 1938, Hoffman 1956, Lemly & Esch 1984. In natural systems, results are more variable with some studies showing deleterious effects from heavy infections by black spot agents (Harrison & Hadley 1982, Lemly & Esch 1984, whereas others show little or no effect from the parasite (e.g. Vinikour 1977, Baker & Bulow 1985.During studies of the ecology of fishes in Muddy Creek, Wyoming, we observed the widespread prevalence of metacercariae, with apparent different densities per infected individual among fish species. We ...

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Studies on Host Reactions to Larval Parasites. I. The Effect on Weight

Cited by 24 publications

References 4 publications

Assessment ofEpinephelus coioides(Hamilton, 1822) aquaculture systems in the Gulf of Tonkin, Vietnam, by using fish parasites

Assessment ofEpinephelus coioides(Hamilton, 1822) aquaculture systems in the Gulf of Tonkin, Vietnam, by using fish parasites

Within and between Population Variation in Epidermal Club Cell Investment in a Freshwater Prey Fish: A Cautionary Tale for Evolutionary Ecologists

Infection by a black spot-causing species of Uvulifer and associated opercular alterations in fishes from a high-desert stream in Wyoming

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