Practical Observations on the Use of Eggs from Electroshocked Females during Spawning of Inland Fall Chinook Salmon

Barnes, Michael E.; Lott, John P.; Sayler, William A.; Cordes, Rick J.

doi:10.1577/1548-8454(1999)061<0162:pootuo>2.0.co;2

Cited by 12 publications

(30 citation statements)

References 10 publications

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“…In long-term studies, yearling rainbow trout, Oncorhynchus mykiss (Walbaum), were exposed to a voltage gradient of 1 V cm À1 for 30 s (Maxfield et al 1971). Eggs of O. tshawytscha caught by electrofishing did not show differences in egg size or number to a control group, but an increased mortality until eyed stage in eggs from electro shocked females (37.9 vs 17.9% in the control group) was observed (Barnes et al 1999). An immediate effect on the fertility of ripe females (spawners) was found when using gametes from shocked (100 V, AC) and unshocked pink salmon, Oncorhynchus gorbuscha (Walbaum), for breeding experiments (Marriott 1973).…”

Section: Introductionmentioning

confidence: 69%

“…According to the literature (Lamarque 1990; Beaumont et al Survival rates from three laboratory treatment groups representing different distance groups plotted against effective voltage assuming that treated (anesthetised) fish experienced similar effective voltages than measured (dead) fish in the respective distance group (anode distances: 10 cm (1.02 V cm À1 ), 40 cm (0.62 V V cm À1 ) and 80 cm (0.48 V V cm À1 )) and control group (0.00 V cm À1 ). The findings for O. tshawytscha may illustrate this issue: values from four studies (Roach 1996;Tipping & Gilhuly 1996;Barnes et al 1999;Zydlewski et al 2008) vary from À66 to 1670% changes in mortality. Surveys for northern pike Esox lucius Linnaeus and razorback sucker Xyrauchen texanus (Abbott) reported less pronounced increases in egg mortality (not more than 2.3%) than that (6.7%) observed in the more sensitive salmonids (Walker et al 1994;Muth & Ruppert 1996).…”

Section: Discussionmentioning

confidence: 98%

“…2002), salmoniform species are more influenced by electrofishing than others; this also seems to be the case for their gametes. In some studies, higher egg mortalities were found for electrofishing with voltages between 250 and 350 V (Roach 1996;Barnes et al 1999) than for electric immobilising with high voltage up to 550 V (Tipping & Gilhuly 1996;Zydlewski et al 2008). The general problem in comparing the existing data is that electrofishing techniques used may be modified to suit to the environmental conditions to be successful and there are no standardised methods for the investigation of the effect of electricity on ripe fish eggs.…”

Section: Discussionmentioning

confidence: 99%

“…However, there are potential risks, such as improper use of electric equipment (e.g. Fish can suffer from haemorrhaging or spinal cord injuries caused by strong muscle contractions or may die due to muscle tetanus and exhaustion (Lamarque 1990), which may appear immediately or even after hours or days (Barnes et al 1999). Excessive exposure to high-intensity electrical fields is thought to be one of the major causes for casualties during electrofishing (Snyder 2003).…”

Section: Introductionmentioning

confidence: 99%

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Impact of electric fishing on egg survival of whitefish, Coregonus lavaretus

Oberlercher

Wanzenböck

2016

Fisheries Management Eco

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Previous studies on the effects of electrofishing on fish eggs have reported widely varying results, ranging from gentle to adverse impacts on egg survival rates, and this may be attributable to inadequately standardised assessment methods. The impact of electrofishing on the survival of European whitefish, Coregonus lavaretus L., eggs was analysed in laboratory experiments and in a comparative field study. Different anode distances and time points post‐treatment were evaluated after artificial fertilisation with milt of untreated males, and survival rates were determined in the morula stage. In the laboratory, no significant difference in survival rates was found between various time points of stripping the gametes post‐electric shock. In the treatment group, significantly lower survival rates were detected in eggs (98.6%; SE = 0.20%) compared to the control group (99.6%; SE = 0.11%). Analysis of the egg survival rates in relation to effective voltage, rather than anode distance, revealed a significant trend of declining survival with increasing effective voltage. In field studies, eggs of electroshocked fish showed significantly lower survival (94.8%; SE = 1.03%) than untreated controls (98.7%; SE = 0.38%). Although electrofishing enhanced egg mortality, overall survival was noticeably high (>90%), indicating a relatively small impact.

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Section: Introductionmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impact of electric fishing on egg survival of whitefish, Coregonus lavaretus

Oberlercher

Wanzenböck

2016

Fisheries Management Eco

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“…Barnes et al. () also documented reduced survival of eggs from electrofished landlocked Chinook Salmon females.…”

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confidence: 95%

Electrofishing of Landlocked Fall Chinook Salmon Broodstock Negatively Impacts Egg Survival

et al. 2018

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Electrofishing is frequently used to collect landlocked fall Chinook Salmon Oncorhynchus tshawytscha broodstock. This experiment compared reproductive parameters, including egg survival, from female salmon that had either been obtained by electrofishing or passively captured after ascending a fish ladder. Mean ± SE percent survival to the eyed stage of development was significantly lower for eggs spawned from females that had been electroshocked (16.66 ± 4.68%) compared to those from females obtained at the fish ladder (31.53 ± 3.55%). There were no significant differences in spawning female TL, postspawn weight, egg size, or fecundity between the two groups. A significant correlation was observed between the survival of eggs from electroshocked females and the frequency of female handling; no such correlation was observed in eggs from ladder‐run females. Although electrofishing may be useful in gathering landlocked fall Chinook Salmon broodstock, lower egg survival can be expected. This may be mitigated, however, by decreasing the number of handling events to which fish are subjected prior to spawning.

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Methodological factors affecting capture of juvenile salmon in baited “minnow” traps

Peltola,

Rinella,

Benson

et al. 2024

N American J Fish Manag

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ObjectiveIn a southcentral Alaska stream system, we conducted a study to evaluate the effect of trap type (galvanized and nylon coated), bait type (salmon roe cured with and without sodium sulfite), and soak times (1 h and 24 h) on captures of juvenile salmon using Gee‐style minnow traps. This was undertaken due to the limited research on this topic, aiming to determine how variations in methodology affected captures in juvenile salmon.MethodsWe employed a three‐way fixed factorial design to sample 176 stream reaches (with a single trap in each each) from June 2021 to September 2021, capturing 296 Coho Salmon Oncorhynchus kisutch and 105 Chinook Salmon O. tshawytscha.ResultWe found an estimated 78% decrease in captures of Coho Salmon when nylon‐coated traps were used instead of galvanized traps, and we found that trap type showed no effect on number of captures for Chinook Salmon. Additionally, we did not detect effects of bait type and soak time on the number of captures for either species. Not surprisingly, there was a positive relationship between Julian date and temperature with captures for both species. Additionally, for Coho Salmon, we found a quadratic relationship between water velocity and captures.ConclusionUnderstanding and accounting for these factors will help researchers to maximize trapping efficiency, standardize protocols, and determine the extent to which results are comparable across studies employing different methods.

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Practical Observations on the Use of Eggs from Electroshocked Females during Spawning of Inland Fall Chinook Salmon

Cited by 12 publications

References 10 publications

Impact of electric fishing on egg survival of whitefish, Coregonus lavaretus

Impact of electric fishing on egg survival of whitefish, Coregonus lavaretus

Electrofishing of Landlocked Fall Chinook Salmon Broodstock Negatively Impacts Egg Survival

Methodological factors affecting capture of juvenile salmon in baited “minnow” traps

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