Effects of rainbow trout (Oncorhynchus mykiss) on amphibians in productive recreational fishing lakes of British Columbia

2007 ◽  
Vol 64 (12) ◽  
pp. 1770-1780 ◽  
Author(s):  
Joanna Lynne McGarvie Hirner ◽  
Sean P Cox
Keyword(s):  
British Columbia ◽  
Rainbow Trout ◽  
Body Size ◽  
Oncorhynchus Mykiss ◽  
Relative Abundance ◽  
Amphibian Conservation ◽  
Recreational Fishing ◽  
Study Region ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Salamander Larvae

Stocking lakes with trout to enhance recreational fishing can negatively affect native aquatic species. Our objectives were (i) to compare presence, relative abundance, body size, and developmental stage of amphibians in lakes with and without rainbow trout (Oncorhynchus mykiss) in British Columbia’s southern interior, and (ii) to estimate the size of trout impact for application to amphibian conservation. Presence of long-toed salamander (Ambystoma macrodactylum), Columbia spotted frog (Rana luteiventris), and Pacific treefrog (Pseudacris regilla) was not significantly different between lake types. In contrast, western toad (Bufo boreas) larvae presence and relative abundance were significantly higher in lakes with trout. Relative abundance of salamander larvae was significantly lower in lakes with trout, but hypothesis testing did not provide consistent evidence of significantly lower abundances of spotted frog and treefrog larvae. However, estimated ratios of relative abundance (impact) indicated that larvae of the salamander and two frogs were ≥65% less abundant in lakes with trout. Salamander larvae were significantly smaller in lakes with trout. Although amphibians may currently coexist with trout in our study region, trout stocking policy in British Columbia should consider amphibian conservation because the presence of trout is associated with lower amphibian abundance and body size in individual lakes.

Digestive characteristics and blood chemistry profile of triploid rainbow trout Oncorhynchus mykiss: influence of body size and seasonal variation

2019 ◽  
Vol 85 (6) ◽  
pp. 1001-1010 ◽  
Author(s):  
Yuqiong Meng ◽  
Buying Han ◽  
Changzhong Li ◽  
Kangkang Qian ◽  
Xiaohong Liu ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Rainbow Trout ◽  
Body Size ◽  
Oncorhynchus Mykiss ◽  
Blood Chemistry ◽  
Rainbow Trout Oncorhynchus Mykiss

scholarly journals Telomere length variation does not correspond with the growth disturbances in the rainbow trout (Oncorhynchus mykiss)

2021 ◽  
Author(s):  
Ligia Panasiak ◽  
Karolina Szubert ◽  
Marcin Polonis ◽  
Konrad Ocalewicz
Keyword(s):  
Rainbow Trout ◽  
Body Size ◽  
Oncorhynchus Mykiss ◽  
Telomere Length ◽  
Somatic Growth ◽  
Normal Growth ◽  
The Body ◽  
Length Variation ◽  
Telomere Attrition ◽  
Rainbow Trout Oncorhynchus Mykiss

AbstractSomatic growth is considered to affect pace of the telomere attrition in vertebrates. As normally developed and dwarf fish differ in the body size we have decided to compare telomere length in the rainbow trout (Oncorhynchus mykiss) with normal growth and with growth reduced due to the dwarf condition. Examined 1-year-old fish with normal and dwarf appearance were siblings originated from androgenetic fully homozygous doubled haploid (DH) line of rainbow trout. Particular dwarf individuals had body deformities such as humpback, kyphosis, and lordosis. Somatic cells of examined rainbow trout had an average telomere length between 17 and 20 kb, comparable in females and males. Dwarf rainbow trout exhibited significantly lower body length and weight than their normally developed siblings even though no differences in the telomere length were found between these fishes. Statistical analysis did not exhibit any correlation between body size and the telomere length. Equal length of telomeres observed in the studied normal and dwarf rainbow trout suggests morphological and physiological differences in fish with different growth rates do not affect dynamics of telomeric DNA. Or any variation in the telomere length might have been levelled by telomerase that in rainbow trout is active in all tissues irrespective of the individual developmental stage.

scholarly journals Population estimate of wild rainbow trout in a remote stream of southern California

2021 ◽  
Vol 107 (1) ◽  
pp. 21-32
Author(s):  
Russell M. Barabe
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Southern California ◽  
Habitat Type ◽  
Type A ◽  
Population Estimate ◽  
Recreational Fishing ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Complex Habitat ◽  
Downstream Distribution

Recreational fishing for Rainbow Trout (Oncorhynchus mykiss) is important economically in California. We determined the upstream and downstream distribution of Rainbow Trout in a southern California stream, and classified all available habitat within that area as riffle, pool, cascade-pool-complex, and flatwater. Approximately 10% (based on length) of each habitat type was sampled using depletion electrofishing. We estimated Rainbow Trout abundance, both <100 mm and ≥100 mm, by extrapolating average number of fish per m² in each habitat type sampled to the total m² of each habitat type. A total of 854 fish were captured, with the greatest proportion coming from the cascade-pool-complex habitat type, followed by pool, flatwater, and riffle. The population estimate for Rainbow Trout <100 mm was 1,763 fish (95% CI ±442), and for Rainbow Trout ≥100 mm was 5,383 fish (95% CI ±1,688).

scholarly journals Influence of Body Size on Blood Hemogram in Rainbow Trout Oncorhynchus Mykiss (Walbaum, 1792)

2017 ◽  
Vol 2 (3) ◽  
pp. 91-94 ◽  
Author(s):  
Francesco Fazio ◽  
◽  
Concetta Saoca ◽  
Irene Vazzana ◽  
Giuseppe Piccione ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Body Size ◽  
Oncorhynchus Mykiss ◽  
Rainbow Trout Oncorhynchus Mykiss

scholarly journals Ecotypic differentiation of native rainbow trout (Oncorhynchus mykiss) populations from British Columbia

2005 ◽  
Vol 62 (7) ◽  
pp. 1523-1539 ◽  
Author(s):  
E R Keeley ◽  
E A Parkinson ◽  
E B Taylor
Keyword(s):  
British Columbia ◽  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Large Scale ◽  
Spatial Scales ◽  
Morphological Differentiation ◽  
Predictive Ability ◽  
Geographic Area ◽  
Ecotypic Differentiation ◽  
Rainbow Trout Oncorhynchus Mykiss

We sampled 34 native rainbow trout (Oncorhynchus mykiss) populations over a wide geographic area of British Columbia to determine whether variation in morphology is related to differences in habitat or fish community characteristics experienced by a population. After correcting for differences in body size, the most dramatic differences occurred in external characteristics between stream- and lake-dwelling populations. Rainbow trout from streams had more robust bodies with larger caudal peduncles and heads and longer paired fins than rainbow trout from lakes. Unlike other lake populations, piscivorous rainbow trout populations had relatively large heads and mouths that were more similar in size to those of stream-dwelling populations. We found fewer differences in the size of internal organs across ecotypes, producing little predictive ability of these characteristics to differentiate populations of rainbow trout. We also sampled 27 additional rainbow trout populations with unknown fish communities to determine how well large-scale patterns predict morphological differentiation over a smaller spatial scale. Of the five ecotypes that we detected at a smaller scale, the largest differences again occurred between stream and lake populations. Our data suggest that external morphological variation among populations of rainbow trout covaries with ecological conditions at a variety of spatial scales, particularly between lakes and rivers.

Reduced swimming performance and increased growth in domesticated rainbow trout, Oncorhynchus mykiss

2009 ◽  
Vol 66 (7) ◽  
pp. 1025-1032 ◽  
Author(s):  
Drew Reinbold ◽  
Gary H. Thorgaard ◽  
Patrick A. Carter
Keyword(s):  
Rainbow Trout ◽  
Body Size ◽  
Oncorhynchus Mykiss ◽  
Body Mass ◽  
Growth Rates ◽  
Swimming Performance ◽  
Large Body ◽  
High Growth ◽  
Hybrid Progeny ◽  
Rainbow Trout Oncorhynchus Mykiss

Domesticated populations of rainbow trout ( Oncorhynchus mykiss ) probably have been selected for high growth rates and large body size, which may have resulted in reduced sprint swimming performance. We hypothesized that more domesticated populations of rainbow trout would have higher growth rates and larger body size, but slower swim speed, relative to semiwild populations. We tested this hypothesis by measuring body mass, body length, and sprint swim speed multiple times over 92 days in progeny from crosses between males from three clonal lines and an outbred female. We found significantly higher body masses and significantly slower swim speeds in the highly domesticated Arlee and Hot Creek progeny groups compared with the semiwild Swanson hybrid progeny group, supporting our hypothesis. Growth rates also differed significantly among groups, but at the ages measured, the Swanson hybrid progeny had an intermediate growth rate. However, given the differences in body mass, either growth rates were higher in the more domesticated progeny groups at young unmeasured ages and (or) they hatched at a significantly larger body mass than the semiwild Swanson hybrid.

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