Early development of the ectoparasite Caligus rogercresseyi under combined salinity and temperature gradients

Montory, Jaime A.; Cumillaf, Juan Pablo; Cubillos, V.; Paschke, Kurt; Urbina, Mauricio A.; Gebauer, Paulina

doi:10.1016/j.aquaculture.2017.12.017

Cited by 26 publications

(33 citation statements)

References 61 publications

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“…Also, Bartsch et al (2013) and Molloy et al (2011) identified copepodids of the sea lice Lepeophtheirus salmonis (length: 684 ± 16 µm) in the guts of M. edulis. The average size of C. rogercresseyi copepodid used in the present study was 620 (± 22) µm, which is 29% larger than the nauplius II stage (González & Carvajal, 2003;Montory et al, 2018). Therefore, M. chilensis could be expected to be able to filter and retain particles at least as large 620 µm from the water column, similar to the potential prey sizes of M. edulis (Davenport et al, 2000).…”

Section: Discussionmentioning

confidence: 66%

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confidence: 99%

“…The lifespan of copepods in the water column is highly influenced by water temperature (Escribano, Irribarren, & Rodriguez, 1997;Groner, McEwan, Rees, Gettinby, & Revie, 2016;Montory et al, 2018). The mean lifespan of free-living stages of C. rogercresseyi in the water column is 20 days at 12°C (González & Carvajal, 2003;Montory et al, 2018). The first 4 days of pelagic life correspond to nauplius larval stages, which moult to a copepodid stage that may live up to 16 days without a host (González & Carvajal, 2003;Montory et al, 2018).…”

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confidence: 99%

“…The mean lifespan of free-living stages of C. rogercresseyi in the water column is 20 days at 12°C (González & Carvajal, 2003;Montory et al, 2018). The first 4 days of pelagic life correspond to nauplius larval stages, which moult to a copepodid stage that may live up to 16 days without a host (González & Carvajal, 2003;Montory et al, 2018). Early developmental stages (e.g.…”

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confidence: 99%

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The filter‐feeding bivalve Mytilus chilensis capture pelagic stages of Caligus rogercresseyi: A potential controller of the sea lice fish parasites

Montory

Chaparro

Averbuj

et al. 2020

Journal of Fish Diseases

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The copepod Caligus rogercresseyi is an ectoparasite of several salmonid species. The pumping activity of filter‐feeding molluscs could reduce the abundance of copepod dispersive larval stages in the water column. In this research, nauplius II and copepodid larvae of C. rogercresseyi were exposed to filtering mussels (Mytilus chilensis) of different sizes. These mussels were able to filter both larval stages, although they were more efficient in catching nauplius II. The fact that nauplius II were ingested more efficiently could be explained by their smaller size, lower swimming velocity (escape) and longer resting times between movements, when they were exposed to the influx of water around the inhalant area of the mussels. Larger mussels were more effective filtering C. rogercresseyi larvae due to their larger inhalant area and the related water influx. Additionally, the results suggest that larvae captured by the mussels can be incorporated into pseudofaeces or ingested and then released as part of the faeces. Thus, high concentrations of M. chilensis surrounding salmon farms may act as biological barriers, reducing the density of copepod dispersive larval stages and, thus, salmon infestations.

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Section: Discussionmentioning

confidence: 66%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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The filter‐feeding bivalve Mytilus chilensis capture pelagic stages of Caligus rogercresseyi: A potential controller of the sea lice fish parasites

Montory

Chaparro

Averbuj

et al. 2020

Journal of Fish Diseases

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“…The fit is based on data which are a mix of the two L. salmonis subspecies, but these data from different subspecies agree quite closely ( Figure S.1d, blue and black symbols). Data for C. rogercresseyi ( Figure S.1d, green squares containing an ×, Montory et al 2018) was not considered for the model fit, but shows that egg strings are produced more quickly for C. rogercresseyi at 5-10 • C as compared to L. salmonis.…”

Section: S1 Parameter Descriptions and Estimationmentioning

confidence: 99%

Regional climate affects salmon lice dynamics, stage structure, and management

Hurford

Wang

Zhao

2019

Preprint

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Regional variation in climate can generate differences in population dynamics and stage structure. Where regional differences exist, the best approach to pest management may be region specific. Salmon lice are a stage structured marine copepod that parasitizes salmonids at aquaculture sites worldwide, and have fecundity, development, and mortality rates that depend on temperature and salinity. We show that in Atlantic Canada and Norway, where the oceans are relatively cold, salmon lice abundance decreases during the winter months, but ultimately increases from year-to-year, while in Ireland and Chile, where the oceans are warmer, the population size grows monotonically without any seasonal declines. In colder regions, during the winter the stage structure is dominated by the adult stage, which is in contrast to warmer regions where all stages are abundant year round. These differences translate into region specific recommendations for management: regions with slower population growth have lower critical stocking densities, and regions with cold winters have a seasonal dependence in the timing of follow-up chemotherapeutic treatments. Predictions of our salmon lice model agree with empirical data, and our approach provides a method to understand the effects of regional differences in climate on salmon lice dynamics and management.

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Without a pinch of salt: effect of low salinity on eggs and nauplii of the salmon louse (Lepeophtheirus salmonis)

2023

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The salmon louse is an economically important parasite on Atlantic salmon and poses a major threat to aquaculture. Several treatment methods have lost their effect due to resistance development in the lice. A rather new method for combatting sea lice is freshwater treatment where the various life stages of lice are differently affected by this treatment. In this study, we analyzed the effect of freshwater on the egg strings. A 3-h treatment with freshwater had a detrimental effect on the egg strings. First, the water penetrated the string, widening it, then entering the eggs and enlarging them. Finally, the ordered structure of the egg strings collapsed, and no alive animals hatched. Shorter treatments had a lower effectivity, and treatments with brackish water also showed milder effects. The egg strings were found to have a protective effect against low salinities, as hatched nauplii died rapidly under conditions that embryos survived. We also found that embryos react to low salinity on a molecular level by changing gene expression of several genes, when incubated in brackish water. Additionally, the hatching of embryos treated with brackish water was delayed in comparison to seawater controls.

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Early development of the ectoparasite Caligus rogercresseyi under combined salinity and temperature gradients

Cited by 26 publications

References 61 publications

The filter‐feeding bivalve Mytilus chilensis capture pelagic stages of Caligus rogercresseyi: A potential controller of the sea lice fish parasites

The filter‐feeding bivalve Mytilus chilensis capture pelagic stages of Caligus rogercresseyi: A potential controller of the sea lice fish parasites

Regional climate affects salmon lice dynamics, stage structure, and management

Without a pinch of salt: effect of low salinity on eggs and nauplii of the salmon louse (Lepeophtheirus salmonis)

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