Control of the Parasitic Copepod<i>Caligus elongatus</i>on Pond-Reared Red Drum

Landsberg, Jan H.; Vermeer, Gregory K.; Richards, Shane A.; Perry, Nigel B.

doi:10.1577/1548-8667(1991)003<0206:cotpcc>2.3.co;2

Cited by 21 publications

(8 citation statements)

References 10 publications

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“…We counted live and dead lice on salmon (excluding gill surfaces) in SW-filled containers kept at room temperature within 5 h. Lice were considered alive if limb or peristaltic stomach movements (assessed under a stereomicroscope) were detected (Landsberg et al 1991). Free-swimming mobile (pre-adult and adult) stages in SW containers were included in counts, under the assumption they were host-attached after treatments.…”

Section: Lice Assessmentsmentioning

confidence: 99%

Early‐stage sea lice recruits on Atlantic salmon are freshwater sensitive

Wright

Oppedal

Dempster

2016

Journal of Fish Diseases

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Sea lice are significant parasites of marine and brackish farmed fishes. Freshwater bathing is a potential control option against numerous sea lice species, although has been viewed as futile against those that are capable of tolerating freshwater for extended periods. By comparing freshwater survival times across host-attached stages of Lepeophtheirus salmonis (Krøyer), a key parasite in Atlantic salmon farming, we show the first attached (copepodid) stage undergoes 96-100% mortality after 1 h in freshwater, whereas later attached stages can tolerate up to 8 days. Thus, regular freshwater bathing methods targeting the more susceptible attached copepodid stage may successfully treat against L. salmonis and potentially other sea lice on fish cultured in marine and brackish waters.

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Section: Lice Assessmentsmentioning

confidence: 99%

Early‐stage sea lice recruits on Atlantic salmon are freshwater sensitive

Wright

Oppedal

Dempster

2016

Journal of Fish Diseases

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“…Despite the positive aspects of red drum aquaculture's rapid expansion, negative impacts from infectious diseases have aroused widespread concern. Various pathogenic organisms including viruses (Bowden, Oestmann, Lewis & Frey 1994; Oh, Jung, Kim, Rajendran, Kim, Choi, Kim & Kim 2002), bacteria (Eldar, Perl, Frelier & Bercovier 1998; Liu, Chuang & Lee 2003) and parasites (Paperna 1984; Landsberg, Vermeer, Richards & Perry 1991; Landsberg 1993; Diamant 1998; Harris 1999) have been documented. Among them, the dinoflagellate Amyloodinium ocellatum is one of most virulent parasitic organisms, and numerous epidemics in aquaculture facilities have been reported worldwide (Lewis, Wang, Ayres & Arnold 1988; Tu, Shih, Lin & Wang 2002).…”

Section: Introductionmentioning

confidence: 99%

A preliminary study on the effects of dietary supplementation of brewers yeast and nucleotides, singularly or in combination, on juvenile red drum (Sciaenops ocellatus)

Li¹,

Burr²,

Goff³

et al. 2005

Aquaculture Res

103

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This study was designed to evaluate the e¡ects of dietary supplementation with brewers yeast (Brewtech s ) and nucleotides (Optimu" n), either singularly or in combination, on red drum growth, body composition, stress responses and possible resistance to Amyloodinium ocellatum infection. Juvenile red drum ( $ 1g initially) fed practical ¢sh-meal-based diets for 6 weeks had similar weight gain regardless of whether the diet was unsupplemented (basal) or supplemented with brewers yeast (2% of diet), nucleotides (Optimu" n at 0.2% of diet) or both brewers yeast (2% of diet) and nucleotides (Optimu" n at 0.2% of diet). Dietary e¡ects on hepatosomatic index, intraperitoneal fat ratio or whole-body composition were not signi¢cant, except that ¢sh fed the singular nucleotide supplement had a signi¢cantly higher wholebody lipid content compared with ¢sh fed the basal diet. No signi¢cant dietary e¡ects on cortisol response were observed after a 15 min con¢nement stress test perhaps because of the extreme variation among individual ¢sh. Subsequently, in situ challenge by co-habitation with A. ocellatum caused 100% mortality regardless of dietary treatment within a 48 h period. It is concluded that dietary supplementation of brewers yeast and nucleotides did not promote enhanced growth or improved cortisol response and resistance to uncontrolled amyloodiniosis in juvenile red drum, at least at the tested dosages.

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“…Because C. elongatus are not host specific they transfer between hosts (Wootten, Smith & Needham 1982; Neilson, Perry, Scott & Valerio 1987; Bruno & Stone 1990; Stuart 1990). Consequently, the species is one of the most common parasitic copepods in British marine waters (Kabata 1979), parasitizing over 80 species of fish including gadoids, such as cod (Karlsbakk, Otterlei, Hoie & Nylund 2001), scianids (Landsberg, Vermeer, Richards & Perry 1991), herring (MacKenzie & Morrison 1989) and pollack (Shaw & Opitz 1996).…”

Section: Introductionmentioning

confidence: 99%

The epidemiology of the sea lice, Caligus elongatus Nordmann, in marine aquaculture of Atlantic salmon, Salmo salar L., in Scotland

Revie

Gettinby

Treasurer³

et al. 2002

Journal of Fish Diseases

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Although Caligus elongatus is one of two major species of sea lice that parasitize farmed salmon, its epidemiology has not been extensively studied. In this communication, the abundances of the adult stage of C. elongatus in salmon populations from 33 farms in the West of Scotland between 1997 and 2000 have been analysed for evidence of seasonal and annual patterns. The findings indicate that the pattern of C. elongatus is remarkably consistent from year to year, and directly opposed to that reported for Lepeophtheirus salmonis, the other major caligid species. In particular, adult infestations rapidly increase from the start of July each year, and are more prevalent on salmon in the first year of production than the second year. Treatment is seen to have an effect on levels of infestation but it is not clear why this species should have significantly lower levels of abundance in the second year of production. There is also evidence that fallowing has no effect on abundance. Strategic management programmes for the control of sea lice on salmon farms, which are increasingly effective in controlling L. salmonis, may also have to give greater consideration to C. elongatus.

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Control of the Parasitic CopepodCaligus elongatuson Pond-Reared Red Drum

Cited by 21 publications

References 10 publications

Early‐stage sea lice recruits on Atlantic salmon are freshwater sensitive

Early‐stage sea lice recruits on Atlantic salmon are freshwater sensitive

A preliminary study on the effects of dietary supplementation of brewers yeast and nucleotides, singularly or in combination, on juvenile red drum (Sciaenops ocellatus)

The epidemiology of the sea lice, Caligus elongatus Nordmann, in marine aquaculture of Atlantic salmon, Salmo salar L., in Scotland

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