Lake trout (Salvelinus namaycush) spawning behaviour: the evolution of a new female strategy

Esteve, Manu; McLennan, Deborah A.; Gunn, John M.

doi:10.1007/s10641-007-9272-z

Cited by 43 publications

(41 citation statements)

References 25 publications

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“…In rainbow trout, Su et al (1996) suggested Effects of inbreeding on sperm quality that a lack of detection of inbreeding depression on male fertilization success could be attributed to low levels of inbreeding in their study. Accordingly, our results are consistent with those of Zajitschek et al (2009), despite the markedly different systems of mating and sexual selection between the two species (Gunn, 1995;Esteve et al, 2008;Zajitschek and Brooks, 2010). In a study on guppies by Zajitschek et al (2009), four generations of brother-sister matings (F = 0.59) were required to detect any evidence of inbreeding depression on sperm competitiveness.…”

Section: Discussionsupporting

confidence: 87%

The effects of inbreeding on sperm quality traits in captive-bred lake trout, Salvelinus namaycush (Walbaum, 1972)

et al. 2015

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Summary The effects of inbreeding in both captive and wild‐caught species and populations have been reported to affect a wide variety of life history traits. Recently, the effects of inbreeding on reproductive traits such as sperm quality have become a subject of particular interest for conservation biology, evolutionary ecology, and management of captive populations. This study investigated the effects of inbreeding on sperm quality in a captive population of experimentally inbred and outbred lake trout, Salvelinus namaycush. It was found for moderately to highly inbred males (males with half‐sib and full‐sib parents, respectively), that sperm quality traits (velocity, motility, linearity, longevity, spermatocrit and morphology) showed no apparent inbreeding depression. The apparent lack of inbreeding effects on sperm quality traits may be due to several factors including (i) no inbreeding depression in the studied population, due to purging, low levels of inbreeding or lack of detection at the gametic level, or (ii) relaxed selective pressures due to benign hatchery conditions. The present study provides significant insight into the effects of inbreeding on sperm quality in a captive‐bred salmonid population, and has important implications for hatchery rehabilitation programs for this species.

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Section: Discussionsupporting

confidence: 87%

The effects of inbreeding on sperm quality traits in captive-bred lake trout, Salvelinus namaycush (Walbaum, 1972)

et al. 2015

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“…However, use of manual stripping as a surrogate for egg deposition during spawning is a source of bias in our study. Although we did our best to approximate normal egg deposition by holding the trout in a natural spawning posture (that is, head and tail flexed slightly upwards) [33,34] during stripping, we do not know to what extent physical forces applied to the eggs and oviduct transmitter during manual stripping represent those present during natural egg deposition. If force applied during manual stripping was greater than would be present during spawning, our results could overestimate transmitter expulsion rate.…”

Section: Discussionmentioning

confidence: 99%

“…The ovulating trout were removed from the holding tank one at a time and anesthetized as before to prevent excessive stress. Anesthetized trout were held dorsal side up with heads and tails pointed slightly upward, as occurs during natural egg deposition [33,34]. Their bellies were then massaged from anterior to posterior until the oviduct tag was expelled, or the trout stopped expelling eggs.…”

Section: Retention and Expulsion Of Oviduct-inserted Transmittersmentioning

confidence: 99%

Use of oviduct-inserted acoustic transmitters and positional telemetry to estimate timing and location of spawning: a feasibility study in lake trout, Salvelinus namaycush

Binder

Holbrook

Miehls

et al. 2014

Animal Biotelemetry

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Background: Oviduct-inserted transmitters have shown promise for determining precise location of spawning in fishes. Use of traditional manual tracking to locate expelled oviduct transmitters is laborious and accurate estimates of time of transmitter expulsion require frequent surveys. We tested the feasibility of using oviduct-inserted transmitters with positional telemetry to estimate time and location of spawning in lake trout (Salvelinus namaycush). Three assumptions were tested: (1) oviduct transmitters remain within fish until spawning, (2) oviduct transmitters are expelled with the eggs during spawning, and (3) time and location of oviduct transmitter expulsion can be accurately determined. Results: In the laboratory, 39 of 44 (89%) lake trout retained an oviduct transmitter until end of the spawning period and all premature transmitter expulsions occurred before maturation. Natural spawning in the laboratory was not feasible; however, of 35 ripe trout that retained transmitters, 31 (89%) expelled their transmitter with eggs when subjected to manual stripping. Ability to position transmitters with a telemetry array at known spawning sites in Lake Huron (North America) was poor when oviduct transmitters were placed in the substrate compared to transmitters suspended 1 m above substrate -78% of transmitters in substrate could not be positioned. However, in simulations, time and location of spawning were determined with reasonable accuracy by double-tagging trout with one transmitter that is expelled with the eggs during spawning while another transmitter remains in the fish. Accuracy of estimated time and location of transmitter spatial separation varied with distance traveled from spawning site and swimming speed, and was dependent on transmission delay.

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“…Preferred spawning sites are rocky shoals, devoid of vegetation, and the fish will habitually return to the same site each year. [55][56][57][58][59][60][61] This behavior is the key that allows lidar to locate their spawning sites and is also why knowledge of the location of their spawning sites is of such importance in controlling their population.…”

Section: Signal-to-noise Ratio and Signal-to-backgroundmentioning

confidence: 99%

Dual-polarization airborne lidar for freshwater fisheries management and research

et al. 2017

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Abstract. The design of a compact, dual-polarization, nonscanning lidar system intended to fly in a small, singleengine aircraft for airborne study of freshwater marine ecosystems and mapping of fish schools in mountain lakes is discussed. Design trade-offs are presented with special attention paid to selecting the field of view and telescope aperture diameter. Example results and a comparison with a similar existing lidar system are presented.

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Lake trout (Salvelinus namaycush) spawning behaviour: the evolution of a new female strategy

Cited by 43 publications

References 25 publications

The effects of inbreeding on sperm quality traits in captive-bred lake trout, Salvelinus namaycush (Walbaum, 1972)

The effects of inbreeding on sperm quality traits in captive-bred lake trout, Salvelinus namaycush (Walbaum, 1972)

Use of oviduct-inserted acoustic transmitters and positional telemetry to estimate timing and location of spawning: a feasibility study in lake trout, Salvelinus namaycush

Dual-polarization airborne lidar for freshwater fisheries management and research

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