Occurrence of pathogens in Pacific lamprey (Entosphenus tridentatus)

Jackson, Aaron; Moser, Mary L.; Onjukka, Sam T.; LaPatra, Scott E.; Lujan, Kenneth M.; Samson, Corie; White, Melissa G.; Blair, Marilyn; Rhodes, Linda D.; Lampman, Ralph T.; Maine, Alexa; Jolley, Jeffrey C.

doi:10.1007/s11160-019-09572-0

Cited by 4 publications

(2 citation statements)

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“…The mechanism by which microbes colonize the lamprey gut is not well understood; although the results from Moser et al (2020) documented no apparent benefits from this practice, there were also no obvious disadvantages of early microbial inoculation. In other cases, the absence of disinfection during larval rearing resulted in an increased risk of fungal infections (Lampman et al 2016; Jackson et al 2019). Future studies should assess the ontogeny of the external mucosal and gut microbiomes to identify the time at which exposure to microbes is most important and to determine the role of disinfection in lamprey incubation and early larval rearing.…”

Section: Discussionmentioning

confidence: 99%

“…Giri et al (2012) found that probiotics improved innate immunity in teleost fishes, and this may be another benefit of probiotic use. Outside of the laboratory, larval lamprey appear to be relatively resistant to disease or infection as compared with the juvenile and adult life stages (Jackson et al 2019). However, fungal, parasitic, and pathogenic infections have been reported in dense larval cultures in the laboratory (Lampman et al 2021).…”

Section: Discussionmentioning

confidence: 99%

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Probiotics improve survival and growth of larval Pacific Lamprey in laboratory culture

Maine,

Moser,

Jackson

et al. 2023

N American J Fish Manag

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ObjectiveThe Pacific Lamprey Entosphenus tridentatus is a First Food for members of the Confederated Tribes of the Umatilla Indian Reservation and other Columbia Plateau tribes in the Pacific Northwest. Declines in Pacific Lamprey abundance have prompted restoration efforts, including development of artificial propagation. Laboratory rearing of larvae has focused on maximizing survival and growth to conserve resources and increase production. To test the hypothesis that bacterial supplements increased the survival and growth of first‐feeding larval Pacific Lamprey, we conducted two controlled experiments.MethodsFirst, a probiotic supplement (EPI‐CIN G2; Epicore, Bionetworks) was added to a standard food ration (yeast and Otohime mix) at two levels (2 and 5 mg/L) in a replicated, randomized design.ResultGrowth at 10 weeks was measured, and larvae that were fed probiotics at both levels grew significantly faster (2 mg/L: 11.0 μm/day; 5 mg/L: 13.3 μm/day) than controls that were fed the standard ration alone (6.6 μm/day). Larvae that received the probiotic supplement also had a higher survival (2 mg/L: 36%; 5 mg/L: 44%) than those fed the standard ration (24%). Next, a different cohort of larval lamprey was fed the same two levels of probiotic (at the same rate as in the first experiment), but the lamprey was kept in larger rearing pans and were fed for 28 weeks. Overall growth rates in the second experiment (2 mg/L: 4.6 μm/day; 5 mg/L: 5.7 μm/day; control 3.4 μm/day) were lower than those in the first experiment, but growth and survival (2 mg/L: 71.4%; 5 mg/L: 78.6%; control: 55.7%) were both highest in the treatments with probiotic. Moreover, in both experiments, we observed the highest growth in the probiotic treatments that also had high larval density.ConclusionThis suggests that probiotics may help to overcome density‐dependent growth, which is a common problem in lamprey culture. Successful artificial propagation and culture of Pacific Lamprey are vital to the long‐term restoration goals for this imperiled First Food.

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Section: Discussionmentioning

confidence: 99%