Fecundity of Steelhead Trout, <i>Salmo gairdneri</i>, from Alsea River, Oregon

Bulkley, Ross V.

doi:10.1139/f67-082

Cited by 18 publications

(24 citation statements)

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“…The most obvious pattern in our study was that larger Yellowstone Cutthroat Trout produced more offspring than smaller individuals. Similar patterns have been reported extensively in the literature for a variety of taxa, including salmonids (Bulkley ; Riebe et al. ).…”

Section: Discussionsupporting

confidence: 87%

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Effects of Air Exposure During Simulated Catch‐and‐Release Angling on Survival and Fitness of Yellowstone Cutthroat Trout

Roth

Schill

Quist

et al. 2019

N American J Fish Manag

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Concerns have been raised regarding the practice of exposing fish to air during catch‐and‐release (C&R) angling. The purpose of this study was to evaluate the effects of air exposure on short‐ and long‐term survival and progeny production of Yellowstone Cutthroat Trout Oncorhynchus clarkii bouvieri. Prespawn adults were sampled at a weir during upstream migration in 2016 and 2017, exposed to a simulated angling event of 102 s, and then exposed to air for a randomly selected duration of 0, 30, or 60 s. An additional control group was added during 2017 in which fish were not exposed to simulated angling or air. In total, 1,519 fish were sampled in 2016, and 744 fish were sampled in 2017. Additionally, age‐0 fish (2016: n = 2,924; 2017: n = 1,492) were collected to evaluate the effects of air exposure on the production of progeny. No effect of angling itself or of angling and air exposure was observed on short‐term (≤60 d posttreatment) or long‐term (>1 year posttreatment) survival of adults, with one exception. During 2016, fish that had been air exposed for 60 s had a statistically higher short‐term survival rate than fish that received no air exposure. Air exposure had no effect on the proportion of fish that successfully spawned. Regression analysis revealed that neither angling nor air exposure affected progeny production. Considering that much of the literature, as well as this study, reports little to no influence of air exposure on salmonid mortality or reproductive success, it seems highly unlikely that air exposure of less than 60 s during C&R angling would have negative population‐level effects.

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Section: Discussionsupporting

confidence: 87%

“…). Larger fish produce more and larger eggs than smaller fish (Bulkley ). Larger fish also reportedly produce offspring that are more likely to survive due to factors such as better energy resources (yolk) or better habitat conditions selected by larger parents (e.g., large substrates; Palumbi ; Marshall et al.…”

Section: Discussionmentioning

confidence: 99%

Effects of Air Exposure During Simulated Catch‐and‐Release Angling on Survival and Fitness of Yellowstone Cutthroat Trout

Roth

Schill

Quist

et al. 2019

N American J Fish Manag

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“…Egg size has been shown to increase with spawner body size for many species (e.g. Buckley 1967; Rogers and Westin 1981; Lobon‐Cervia et al . 1986; Hislop 1988; Kjesbu 1989; Zastrow et al .…”

Section: Understanding Compensationmentioning

confidence: 99%

Compensatory density dependence in fish populations: importance, controversy, understanding and prognosis

et al. 2001

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Density‐dependent processes such as growth, survival, reproduction and movement are compensatory if their rates change in response to variation in population density (or numbers) such that they result in a slowed population growth rate at high densities and promote a numerical increase of the population at low densities. Compensatory density dependence is important to fisheries management because it operates to offset the losses of individuals. While the concept of compensation is straightforward, it remains one of the most controversial issues in population dynamics. The difficulties arise when going from general concepts to specific populations. Compensation is usually quantified using some combination of spawner–recruit analysis, long‐term field monitoring or manipulative studies, and computer modelling. Problems arise because there are limitations to each of these approaches, and these limitations generally originate from the high uncertainty associated with field measurements. We offer a hierarchical approach to predicting and understanding compensation that ranges from the very general, using basic life‐history theory, to the highly site‐specific, using detailed population models. We analyse a spawner–recruit database to test the predictions about compensation and compensatory reserve that derive from a three‐endpoint life‐history framework designed for fish. We then summarise field examples of density dependence in specific processes. Selected long‐term field monitoring studies, manipulative studies and computer modelling examples are then highlighted that illustrate how density‐dependent processes led to compensatory responses at the population level. Some theoretical and empirical advances that offer hope for progress in the future on the compensation issue are discussed. We advocate an approach to compensation that involves process‐level understanding of the underlying mechanisms, life‐history theory, careful analysis of field data, and matrix and individual‐based modelling. There will always be debate if the quantification of compensation does not include some degree of understanding of the underlying mechanisms.

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“…(r = 0.83). Bulkley (1967) commented upon the latitudinal variation of the fecundity of S. gairdneri in rivers from western U.S.A., reporting values lower than those found in the present survey; according to his data, specimens of 562 mm average standard length from Alsea River (Oregon) yielded 2424 eggs. This site is located at a northern latitude similar to the southern latitude of Buenos Aires Lake where, for an equivalent length, the fecundity is 3.1 times greater (7525 eggs).…”

mentioning

confidence: 49%

Fecundity of rainbow trout, Salmo gairdneri Richardson, from Buenos Aires Lake (Santa Cruz Province, Argentina)

Iwaszkiw¹,

Padin²

1990

Journal of Fish Biology

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Fecundity of Steelhead Trout, Salmo gairdneri, from Alsea River, Oregon

Cited by 18 publications

References 0 publications

Effects of Air Exposure During Simulated Catch‐and‐Release Angling on Survival and Fitness of Yellowstone Cutthroat Trout

Effects of Air Exposure During Simulated Catch‐and‐Release Angling on Survival and Fitness of Yellowstone Cutthroat Trout

Compensatory density dependence in fish populations: importance, controversy, understanding and prognosis

Fecundity of rainbow trout, Salmo gairdneri Richardson, from Buenos Aires Lake (Santa Cruz Province, Argentina)

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