scholarly journals Controls on Somatic Growth and Population Dynamics of Rainbow Trout

2021 ◽  
Vol 102 (1) ◽  
Author(s):  
Josh Korman ◽  
Michael D. Yard ◽  
Maria C. Dzul ◽  
Charles B. Yackulic ◽  
Michael J. Dodrill ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Rainbow Trout ◽  
Somatic Growth

Predicting Distribution, Production, Recreational Fishing Demand, and Conservation Concern of Indigenous Rainbow Trout Populations Based on Landscape Characteristics

2021 ◽  
Author(s):  
Ariane Cantin ◽  
Anne Farineau ◽  
Darren J. Bender ◽  
John R. Post
Keyword(s):  
Population Dynamics ◽  
Rainbow Trout ◽  
Recreational Fishing ◽  
Lake Area ◽  
Fishing Pressure ◽  
Stream Network ◽  
Landscape Characteristics ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Conservation Concern ◽  
Patterns And Processes

Landscape ecology has mainly been integrated in aquatic science to describe patterns and processes in stream networks, but many lakes are connected through their tributaries and are also impacted by their position and connectivity within the watershed. This information on lake characteristics can be used by inland fisheries managers that oversee large landscapes comprising many waterbodies to predict: (1) species composition; (2) population dynamics and productivity; (3) recreational fishing pressure; and (4) overall conservation concern. We developed a methodology to assess these four items for the rainbow trout (Oncorhynchus mykiss) fishery of British Columbia by presenting a case study focused on the Clearwater and North Thompson watersheds using: the connectivity of lakes within the stream network to predict rainbow trout presence, stream order and lake area to estimate habitat availability and predict population dynamics and productivity (supply), and travel time from population centres to predict recreational fishing pressure (demand). By incorporating connectivity and environmental proxies of habitat, we explore patterns in population dynamics that can be used by fisheries managers to identify populations sensitive to overfishing or disturbance.

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 Peptide Purification, Complementary Deoxyribonucleic Acid (DNA) and Genomic DNA Cloning, and Functional Characterization of Ghrelin in Rainbow Trout

Endocrinology ◽  
2003 ◽  
Vol 144 (12) ◽  
pp. 5215-5226 ◽  
Author(s):  
Hiroyuki Kaiya ◽  
Masayasu Kojima ◽  
Hiroshi Hosoda ◽  
Shunsuke Moriyama ◽  
Akiyoshi Takahashi ◽  
...  
Keyword(s):  
Amino Acids ◽  
Rainbow Trout ◽  
Functional Characterization ◽  
Somatic Growth ◽  
Decanoic Acid ◽  
C Terminus ◽  
Ghrelin Gene ◽  
High Level

Abstract We have identified ghrelin from the stomach of rainbow trout. Four isoforms of ghrelin peptide were isolated: the C-terminal amidated type of rainbow trout ghrelin (rt ghrelin) composed of 24 amino acids (GSSFLSPSQKPQVRQGKGKPPRV-amide) is a basic form; des-VRQ-rt ghrelin, which deleted three amino acids (V13R14Q15) from rt ghrelin; and further two types of rt ghrelin that retained the glycine residue at the C terminus, rt ghrelin-Gly, and des-VRQ-rt ghrelin-Gly. The third serine residue was modified by octanoic acid, decanoic acid, or the unsaturated form of those fatty acids. In agreement with the isolated peptides, two cDNAs of different lengths were isolated. The rt ghrelin gene has five exons and four introns, and two different mRNA molecules are predicted to be produced by alternative splicing of the gene. A high level of ghrelin mRNA expression was detected in the stomach, and moderate levels were detected in the brain, hypothalamus, and intestinal tracts. Des-VRQ-rt ghrelin stimulated the release of GH in the rat in vivo. Furthermore, des-VRQ-rt ghrelin stimulated the release of GH, but not the release of prolactin and somatolactin in rainbow trout in vivo and in vitro. These results indicate that ghrelin is a novel GH secretagogue in rainbow trout that may affect somatic growth or osmoregulation through GH. Because ghrelin is expressed in various tissues other than stomach, it may play important role(s) in cellular function as a local regulator.

scholarly journals Effects of species invasion on population dynamics, vital rates, and life histories of the native species

2017 ◽  
Author(s):  
Simone Vincenzi ◽  
Alain J Crivelli ◽  
Dusan Jesensek ◽  
Ellen Campbell ◽  
John C Garza
Keyword(s):  
Population Dynamics ◽  
Rainbow Trout ◽  
Native Species ◽  
Life Histories ◽  
Life History Theory ◽  
Individual Growth ◽  
Growth Trajectories ◽  
Natural Environments ◽  
Vital Rates ◽  
Marble Trout

AbstractInvasions occurring in natural environments provide the opportunity to study how vital rates change and life histories evolve in the presence of a competing species. In this work, we estimate differences in reproductive traits, individual growth trajectories, survival, life histories, and population dynamics between a native species living in allopatry and in sympatry with an invasive species of the same taxonomic Family. We used as a model system marble trout Salmo marmoratus (native species) and rainbow trout Oncorhynchus mykiss (non-native) living in the Idrijca River (Slovenia). An impassable waterfall separates the stream in two sectors only a few hundred meters apart: a downstream sector in which marble trout live in sympatry with rainbow trout and a upstream sector in which marble trout live in allopatry. We used an overarching modeling approach that uses tag-recapture and genetic data (> 2,500 unique marble and rainbow trout were sampled and SNP-genotyped) to reconstruct pedigrees, test for synchrony of population dynamics, and model survival and growth while accounting for individual heterogeneity in performance. The population dynamics of the two marble trout populations and of rainbow trout were overall synchronous. We found higher prevalence of younger parents, higher mortality, and lower population density in marble trout living in sympatry with rainbow trout than in marble trout living in allopatry. There were no differences in the average individual growth trajectories between the two marble trout populations. Faster life histories of marble trout living in sympatry with rainbow trout are consistent with predictions of life-history theory.

Population dynamics of daphnia pulex and utilization by the rainbow trout (salmo gairdneri)

Hydrobiologia ◽  
1980 ◽  
Vol 71 (3) ◽  
pp. 277-287 ◽  
Author(s):  
William W. Taylor ◽  
Shelby D. Gerking
Keyword(s):  
Population Dynamics ◽  
Rainbow Trout ◽  
Daphnia Pulex ◽  
Salmo Gairdneri

scholarly journals Sexual dimorphism in the catfish Genidens genidens (Siluriformes: Ariidae) based on otolith morphometry and relative growth

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
Thaís Rodrigues Maciel ◽  
André Martins Vaz-dos-Santos ◽  
José Ricardo de Souza Barradas ◽  
Marcelo Vianna
Keyword(s):  
Population Dynamics ◽  
Sexual Dimorphism ◽  
Parental Care ◽  
Reproductive Biology ◽  
Somatic Growth ◽  
Life Cycles ◽  
Growth Patterns ◽  
Population Declines ◽  
Otolith Growth ◽  
Relative Growth

ABSTRACT Genidens genidens is a species susceptible to population declines in view of their reproductive biology peculiarities. Morphometric differences between sexes are observed in the literature, and these differences should also be evident in otolith development. Growth patterns are one of the most important biological characteristics regarding population dynamics and management. In this context, the aim of the present study is to describe this species relative growth and identify differences between sex life cycles. Somatic growth-otolith growth relationships and somatic length-weight relationships were estimated based on two methodologies; the Huxley and the polyphasic allometric models. Both models demonstrated different growth patterns between sexes. The three axes of otolith growth were adequate descriptors of growth, and the results of the Huxley model demonstrated distinct growth patterns between sexes, with male otoliths larger in all three measured axes. In the polyphase model, male otoliths were thicker, while female otoliths were longer and higher. Both sexes presented similar length-weight relationships, which may indicate that oocyte production and parental care lead to similar costs for this species.

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