Upper thermal tolerance of larval Arctic lamprey (Lethenteron camtschaticum)

Arakawa, Hiroaki; Yanai, Seiji

doi:10.1007/s10228-020-00757-3

Cited by 5 publications

(2 citation statements)

References 24 publications

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“…Larvae in Experiment 2 were longest when held at 22°C but heaviest and with a higher condition factor at 15°C, which is consistent with the estimated fundamental thermal niche of sea lamprey as falling close to or between 17.8 and 21.8°C [41]. Similarly, larval Arctic lamprey Lethenteron camtschaticum also exhibited the highest growth rates at 18°C [42], and Pacific lamprey larvae grew quickly at 14−19°C [28,30], suggesting larval lamprey growth may be optimized under either "coldwater" or "coolwater" conditions.…”

Section: Discussionsupporting

confidence: 79%

Evaluation of Larval Sea Lamprey Petromyzon marinus Growth in the Laboratory: Influence of Temperature and Diet

Hume,

Bennis,

Bruning

et al. 2024

Aquaculture Research

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Conservation aquaculture provides a means for promoting environmental stewardship, useful both in the context of restoring native species and limiting the production of invasive species. Aquaculture of lampreys is a relatively recent endeavor aimed primarily at producing animals to support the restoration of declining native populations. However, in the Laurentian Great Lakes, where sea lamprey Petromyzon marinus are invasive, the ability to acquire a reliable source of certain life stages would be a significant benefit to those controlling their populations and studying the species. Here, we apply methodologies developed for Pacific lamprey Entosphenus tridentatus restoration to investigate the feasibility of rearing larval sea lamprey under laboratory conditions. In two experiments lasting 3 and 9 months, we tested the effects of different dietary sources and water temperature (ambient and controlled) on the survival and growth of wild-caught larvae. Rearing conditions had no effect on mortality, as larval survival was 100% in both experiments. Growth was significantly affected by water temperature, with the highest average daily growth rates observed at 22 and 15°C (0.14 mm day−1) and lowest at 8°C (0.06 mm day−1). Diets of yeast alone (0.19 and 0.21 g L−1) performed better than those comprising a mixture of yeast and other material when fed 3 times weekly (rice flour, wheat flour, fish meal; 0.19 and 0.32 g L−1). Averaged across the three constant temperatures (8, 15, and 22°C), larvae fed on yeast grew 0.13 mm day−1 and 0.01 g day−1, whereas on yeast + fish meal, they grew 0.09 mm day−1 and 0.01 g day−1. At ambient temperature (4–20°C), larvae fed on yeast grew 0.15 mm day−1 and 0.01 g day−1, whereas those fed on yeast + wheat flour grew 0.13 mm day−1 and 0.008 g day−1 and those fed on yeast + rice flour grew 0.12 mm day−1 and 0.009 g day−1. An experimental duration of 90 days was sufficient to detect significant changes to larval sea lamprey growth stemming from temperature variation. Overall, rearing of sea lamprey in captivity appears feasible at low density (31–32 g m−2 and 17–25 larvae m−2), but uncertainties remain regarding the most appropriate means of providing adequate feed for these fish in high-density conditions.

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Section: Discussionsupporting

confidence: 79%

Evaluation of Larval Sea Lamprey Petromyzon marinus Growth in the Laboratory: Influence of Temperature and Diet

Hume,

Bennis,

Bruning

et al. 2024

Aquaculture Research

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“…Adaptive variation could also be an explanation for the subtle neutral-loci population structure through selection for phenotypes (e.g., total length and weight) that are more fit for environments with certain temperature, flow, and lunar conditions, as distributional differences of Northern Hemisphere species and G. australis have been observed associated with variation in these environmental parameters ( Macey and Potter 1978 ; Sloane 1984 ; Moser et al 2015 ; Potter et al 2015 ; Golovanov et al 2019 ; Arakawa and Yanai 2021 ; Miller et al 2021 ). Our outlier analyses recovered 12 potential adaptive SNPs and suggested that 5 genes, involved in multiple cell functions, may be contributing to the subtle structure of the neutral loci.…”

Section: Discussionmentioning

confidence: 99%

Population Genomics of New Zealand Pouched Lamprey (kanakana; piharau;Geotria australis)

Miller

Timoshevskaya

Smith

et al. 2022

Journal of Heredity

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Pouched lamprey (Geotria australis) or kanakana/piharau is a culturally and ecologically significant jawless fish that is distributed throughout Aotearoa New Zealand. Despite its importance, much remains unknown about historical relationships and gene flow between populations of this enigmatic species within New Zealand. To help inform management, we assembled a draft Geotria australis genome and completed the first comprehensive population genomics analysis of pouched lamprey within New Zealand using targeted gene sequencing (Cyt-b and COI) and restriction site-associated DNA sequencing (RADSeq) methods. Employing 16,000 genome-wide single nucleotide polymorphisms (SNPs) derived from RADSeq (n=186) and sequence data from Cyt-b (766 bp, n=94) and COI (589 bp, n=20), we reveal low levels of structure across 10 sampling locations spanning the species range within New Zealand. F-statistics, outlier analyses, and STRUCTURE suggest a single panmictic population, and Mantel and EEMS tests reveal no significant isolation by distance. This implies either ongoing gene flow among populations or recent shared ancestry among New Zealand pouched lamprey. We can now use the information gained from these genetic tools to assist managers with monitoring effective population size, managing potential diseases, and conservation measures such as artificial propagation programs. We further demonstrate the general utility of these genetic tools for acquiring information about elusive species.

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Upper temperature limit of larval Pacific lamprey Entosphenus tridentatus: implications for conservation in a warming climate

Whitesel

2022

Environ Biol Fish

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Climate models suggest that by 2100, maximum temperatures where many larval Pacific lamprey, Entosphenus tridentatus, rear now may approach 27–31 °C. Little information exists on whether larval Pacific lamprey can tolerate these temperatures. We used acclimated chronic exposure (ACE) and direct acute exposure (DAE) experiments to determine the water temperature that is lethal to larval Pacific lamprey and whether sublethal water temperatures influence larval burrowing behavior. After 30 days in ACE experiments, all larvae survived in temperatures averaging ≤ 27.7 °C, no larvae survived in temperatures averaging ≥ 30.7 °C and the ultimate upper incipient lethal temperature (UILT) was estimated to be 29.2 °C. After seven days in DAE experiments, all larvae survived in 27.1 °C, only larvae acclimated to 23.3 °C survived in 29.1 °C, and no larvae survived in temperatures ≥ 30.6 °C. Using a time to death analysis, estimates of the UILTs ranged from 27.5 to 30.2 °C and the ultimate UILT was estimated to be > 28.3 °C. Using a percent mortality analysis, estimates of the ultimate UILT were not definitive but indicated it may be > 30.2 °C. To burrow, larvae reared for 30 days at temperatures averaging 26.9–27.7 °C exhibited more total time, active time, and stops than those reared for 30 days at temperatures averaging 22.3–23.9 °C. Our findings suggest that larval Pacific lamprey may be resilient to the most likely temperature increase scenarios predicted by climate models. However, they may be vulnerable to the high-temperature increase scenarios and, relatively high but sublethal temperatures may impact the behavior, and ultimately survival, of larval Pacific lamprey.

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Upper thermal tolerance of larval Arctic lamprey (Lethenteron camtschaticum)

Cited by 5 publications

References 24 publications

Evaluation of Larval Sea Lamprey Petromyzon marinus Growth in the Laboratory: Influence of Temperature and Diet

Evaluation of Larval Sea Lamprey Petromyzon marinus Growth in the Laboratory: Influence of Temperature and Diet

Population Genomics of New Zealand Pouched Lamprey (kanakana; piharau;Geotria australis)

Upper temperature limit of larval Pacific lamprey Entosphenus tridentatus: implications for conservation in a warming climate

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