scholarly journals 3. Coho salmon —mass selection and revival of a high growth line

2019 ◽  
Vol 85 (2) ◽  
pp. 210-210
Author(s):  
SHO HOSOYA
Keyword(s):  
Coho Salmon ◽  
High Growth ◽  
Mass Selection ◽  
Growth Line

Stunting of Wild Coho Salmon (Oncorhynchus kisutch) in Seawater: Patterns of Plasma Thyroid Hormones, Cortisol, and Growth Hormone

1992 ◽  
Vol 49 (3) ◽  
pp. 458-461 ◽  
Author(s):  
Vladimir S. Varnavsky ◽  
Tatsuya Sakamoto ◽  
Tetsuya Hirano
Keyword(s):  
Growth Hormone ◽  
Thyroid Hormones ◽  
Brackish Water ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
River Mouth ◽  
High Growth ◽  
Sodium Concentration ◽  
Plasma Sodium ◽  
Plasma Sodium Concentration

Under natural conditions, some coho salmon presmolts (Oncorhynchus kisutch) in Kamchatka have been observed to migrate prematurely to the sea and fail to grow in brackish water for prolonged periods (natural stunts). Plasma levels of growth hormone, cortisol, thyroxine, and triiodothyronine were measured in coho salmon parr captured in the river (freshwater), smolts migrating downstream captured at the river mouth (brackish water), smolts in the sea (seawater), and natural stunts in the inlet (brackish water). The physiological conditions of natural stunts seem analogous to those of hatchery-derived stunts observed in hatchery-reared juveniles in sea pens, with normal plasma sodium concentration, low levels of thyroid hormones and cortisol, and high growth hormone levels.

Adaptive trade-offs in fish energetics and physiology: insights from adaptive differentiation among juvenile salmonids

2020 ◽  
Vol 77 (7) ◽  
pp. 1243-1255 ◽  
Author(s):  
Jordan Rosenfeld ◽  
Jeff Richards ◽  
Dave Allen ◽  
Travis Van Leeuwen ◽  
Gauthier Monnet
Keyword(s):  
Rainbow Trout ◽  
Coho Salmon ◽  
Environmental Gradients ◽  
High Growth ◽  
Growth Efficiency ◽  
Foraging Strategy ◽  
Trade Off ◽  
Active Metabolism ◽  
Trade Offs ◽  
Adaptive Differentiation

Juveniles of different salmonid species often co-exist along environmental gradients, making them a useful model for identifying dominant trade-off axes and their stability within a biological hierarchy (e.g., from individuals to populations to species). In this perspective, we use multivariate trade-offs among juvenile coho salmon (Oncorhynchus kisutch) and rainbow trout (Oncorhynchus mykiss) as a case study to explore broader-scale patterns of trait association. Multivariate ordination identified a dominant trade-off axis between high growth, consumption, and growth efficiency versus high aerobic scope and active metabolism among individual juvenile rainbow trout and three ecologically divergent rainbow trout populations. This pattern suggests a dominant trade-off between growth and active metabolism among individuals and populations, facilitated by simple developmental controls on increased energy intake (larger digestive tract, potentially more risky foraging behavior). In contrast, the adaptive trade-off differentiating species appears to have shifted to maximizing growth and consumption (rainbow trout) versus maximizing growth efficiency (coho), based on evolved differences in foraging strategy and digestive physiology. The generality of these patterns remains uncertain, but trade-offs related to growth efficiency may be an underappreciated dimension of adaptive differentiation in fishes, and their relationship to digestive strategy and active metabolism warrants further investigation.

Prey tell: what quillback rockfish early life history traits reveal about their survival in encounters with juvenile coho salmon

2020 ◽  
Vol 650 ◽  
pp. 7-18 ◽  
Author(s):  
HW Fennie ◽  
S Sponaugle ◽  
EA Daly ◽  
RD Brodeur
Keyword(s):  
Life History ◽  
Early Life ◽  
Life History Traits ◽  
Direct Evidence ◽  
Coho Salmon ◽  
Larval Fish ◽  
Early Life History ◽  
In The Wild ◽  
Otolith Microstructure Analysis ◽  
Pelagic Juvenile

Predation is a major source of mortality in the early life stages of fishes and a driving force in shaping fish populations. Theoretical, modeling, and laboratory studies have generated hypotheses that larval fish size, age, growth rate, and development rate affect their susceptibility to predation. Empirical data on predator selection in the wild are challenging to obtain, and most selective mortality studies must repeatedly sample populations of survivors to indirectly examine survivorship. While valuable on a population scale, these approaches can obscure selection by particular predators. In May 2018, along the coast of Washington, USA, we simultaneously collected juvenile quillback rockfish Sebastes maliger from both the environment and the stomachs of juvenile coho salmon Oncorhynchus kisutch. We used otolith microstructure analysis to examine whether juvenile coho salmon were age-, size-, and/or growth-selective predators of juvenile quillback rockfish. Our results indicate that juvenile rockfish consumed by salmon were significantly smaller, slower growing at capture, and younger than surviving (unconsumed) juvenile rockfish, providing direct evidence that juvenile coho salmon are selective predators on juvenile quillback rockfish. These differences in early life history traits between consumed and surviving rockfish are related to timing of parturition and the environmental conditions larval rockfish experienced, suggesting that maternal effects may substantially influence survival at this stage. Our results demonstrate that variability in timing of parturition and sea surface temperature leads to tradeoffs in early life history traits between growth in the larval stage and survival when encountering predators in the pelagic juvenile stage.

Comparing Genetic Variation within Red Winter Wheat Populations with and without Image-Based Optical Sorter Selection

2019 ◽  
Vol 9 (2) ◽  
pp. 266-277
Author(s):  
Hussein M. Khaeim ◽  
Anthony Clark ◽  
Tom Pearson ◽  
Dr. David Van Sanford
Keyword(s):  
Genetic Variation ◽  
Fusarium Head Blight ◽  
Heading Date ◽  
Fusarium Head Blight Resistance ◽  
Gibberella Zeae ◽  
Mass Selection ◽  
Head Blight ◽  
Red Winter Wheat ◽  
Two Populations ◽  
Head Scab

Head scab is historically a devastating disease affecting not just all classes of wheat but also barley and other small grains around the world. Fusarium head blight (FHB), or head scab, is caused most often by Fusarium graminearum (Schwabe), (sexual stage – Gibberella zeae) although several Fusarium spp. can cause the disease. This study was conducted to determine the effect of mass selection for FHB resistance using an image-based optical sorter. lines were derived from the C0 and C2 of two populations to compare genetic variation within populations with and without sorter selection. Our overall hypothesis is that sorting grain results in improved Fusarium head blight resistance. Both of the used wheat derived line populations have genetic variation, and population 1 has more than population 17. They are significantly different from each other for fusarium damged kernel (FDK), deoxynivalenol (DON), and other FHB traits. Although both populations are suitable to be grown for bulks, population 1 seems better since it has more genetic variation as well as lower FDK and DON, and earlier heading date. Lines within each population were significantly different and some lines in each population had significantly lower FDK and DON after selection using an optical sorter. Some lines had significant reduction in both FDK and DON, and some others had either FDK or DON reduction. Lines of population 1 that had significant reduction, were more numerous than in population 17, and FDK and DON reduction were greater.

Economic and legal instruments for the realization of foreign direct investment in infrastructure sectors of the economy

2020 ◽  
pp. 47-55
Author(s):  
Orshanska Marіana
Keyword(s):  
Foreign Direct Investment ◽  
Direct Investment ◽  
High Growth ◽  
Well Being ◽  
Gradual Improvement ◽  
Fdi Inflows ◽  
Investment Projects ◽  
Analysis And Synthesis ◽  
High Level ◽  
Fdi Attraction

The purpose of the article is to determine the nature, characteristics and keyproblems of the main types of economic and legal instruments for the realizationof foreign direct investment (FDI). the methodological basis of the study is asystematic approach to the processing and compilation of statistics and indicators,as well as methods for their comparison, analysis and synthesis and a method offorecasting decisions on the use of investment potential to increase the attractivenessand volume of FDI attraction. The scientific novelty of the research lies in theanalysis of greenfield and brownfield strategies as the main forms of FDIimplementation, the disclosure of the content and interpretation of data on thereal state of FDI attraction, the search for opportunities to improve the investmentclimate and effective mechanisms for attracting foreign investors. conclusions. Itis confirmed that the investment attractiveness and rating of the country in theinternational market are the main factors for attracting investors. Inaccessibleinfrastructure, inefficient judicial system, high level of corruption and imperfectlegislation are the main obstacles that need to be overcome in order to attractforeign investors’ funds, providing a full package of assistance and support ateach stage of the implementation of investment projects. Greenfield and brownfield(M&A) are the most effective forms of FDI in order to achieve high growth ratesof the domestic economy, improve the level of population well-being andinternationally enter Ukraine. An analysis of the statistics on the effectiveness ofinnovative enterprise development projects, the characteristics of economic andlegal instruments indicate the gradual improvement of the investment climate andthe promotion of FDI inflows into the region’s economy through the implementationof greenfield and brownfield strategies. Examples of effective implementation ofthese strategies in the creation of new enterprises, companies of foreignrepresentation, which are expanding their capacity and entering new domesticmarkets are given. Examples of the brownfield strategy have been analyzed torestart existing and high-quality structural and organizational changes in inefficiententerprises, which have given impetus to improving the economic environment,investment attractiveness of the economy of the region and the country as a whole.

Malaysia in 1995: High Growth, Big Deficit, Stable Politics

Asian Survey ◽  
1996 ◽  
Vol 36 (2) ◽  
pp. 123-129 ◽  
Author(s):  
Mohamed Jawhar bin Hassan
Keyword(s):  
High Growth

PENGARUH KADAR PROTEIN DAN LEMAK PAKAN TERHADAP PERTUMBUHAN DAN KOMPOSISI BADAN IKAN KERAPU MACAN, Epinephelus fuscoguttatus

2016 ◽  
Vol 5 (2) ◽  
pp. 277
Author(s):  
Usman Usman ◽  
Neltje Nobertine Palinggi ◽  
Kamaruddin Kamaruddin ◽  
Makmur Makmur ◽  
Rachmansyah Rachmansyah
Keyword(s):  
Lipid Content ◽  
Lipid Level ◽  
Block Design ◽  
High Growth ◽  
Biological Variables ◽  
Randomized Block Design ◽  
Tiger Grouper ◽  
Test Fish ◽  
Net Cages ◽  
Protein Diets

Penelitian ini dilakukan untuk mendapatkan informasi tentang kebutuhan optimum kadar protein dan lemak pakan terhadap pertumbuhan dan komposisi badan ikan kerapu macan ukuran konsumsi. Sembilan pakan uji dibuat dalam bentuk moist pelet dengan tiga dosis protein (46%, 49%, dan 52%) dan tiga dosis lemak (9%, 11%, dan 13%). Ikan uji dipelihara dalam 27 keramba jaring apung ukuran 1 m x 1 m x 2 m selama 140 hari, diberi pakan uji secara satiasi dua kali sehari dan diset dalam rancangan acak kelompok pola faktorial berdasarkan kelompok ukuran bobot awal ikan yaitu (i) 122,0±4,2 g; (ii) 144,0±7,1 g; dan (iii) 172,9±10,5 g. Hasil penelitian menunjukkan bahwa laju pertumbuhan spesifik dan sintasan ikan relatif sama (>0,05) di antara perlakuan. Efisiensi pakan cenderung meningkat dengan meningkatnya kadar protein dan lemak pakan. Tingkat efisiensi pemanfaatan protein cenderung menurun dengan meningkatnya kadar protein pakan, tetapi meningkat dengan meningkatnya kadar lemak pakan. Hasil analisis proksimat badan ikan menunjukkan bahwa kadar bahan kering dan lemak ikan relatif tidak dipengaruhi (P>0,05) oleh peningkatan kadar protein pakan, namun kadar bahan kering dan lemak ikan tersebut sedikit naik dengan meningkatnya kadar lemak pakan. Kadar protein dan abu ikan relatif tidak dipengaruhi oleh perubahan kadar protein dan lemak pakan. Berdasarkan hasil penelitian ini tampak bahwa pakan dengan kadar protein 49% dan lemak sekitar 11% mampu memberikan pertumbuhan dan komposisi badan ikan kerapu macan yang baik.This experiment was conducted to investigate the optimum dietary protein and lipid level for growth and body composition of tiger grouper. Nine dietary experiments were formulated to moist pellet contain three levels of protein (46%, 49%, and 52%) and three levels of lipid (9%, 11%, and 13%). The fish were fed twice daily to satiation for 140 days in twenty seven net cages of 1 m x 1 m x 2 m, were set up factorial randomized block design based on fish size group i.e. (i) 122.0±4.2 g, (ii) 144.0±7.1 g, and (iii) 172.9±10.5 g. The results shown that specific growth rate and survival rate were not significant different (P>0.05) for all treatments. Feed efficiency increased when protein and lipid content increased. Protein efficiency decreased when protein diets increased and increased when lipid diets increased. No interaction occurred between protein and lipid content to all observable biological variables. Dry matter and lipid content of test fish were not affected by protein diets increase but by lipid diet content. Protein and ash of test fish were not affected by either protein or lipid contained in diet. To assure high growth rates and high quality of fish product, it is suggested to feed tiger grouper with diet containing 49% protein and 11% lipid. 

Sign in / Sign up

Export Citation Format

Share Document