Freshwater life history of chinook salmon(Oncorhynchus tshawytscha)in the Rangitata River catchment, New Zealand

1989 ◽  
Vol 23 (3) ◽  
pp. 311-319 ◽  
Author(s):  
Sally F. Davis ◽  
Martin J. Unwin
Keyword(s):  
Life History ◽  
New Zealand ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
River Catchment ◽  
History Of

Changes in life history parameters in a naturally spawning population of chinook salmon (Oncorhynchus tshawytscha) associated with releases of hatchery-reared fish

1997 ◽  
Vol 54 (6) ◽  
pp. 1235-1245 ◽  
Author(s):  
M J Unwin ◽  
G J Glova
Keyword(s):  
Life History ◽  
New Zealand ◽  
Chinook Salmon ◽  
Life History Traits ◽  
Oncorhynchus Tshawytscha ◽  
Fork Length ◽  
Age At Maturity ◽  
Natural Origin ◽  
Parent Stock ◽  
Stream Type

Chinook salmon (Oncorhynchus tshawytscha) spawning runs in Glenariffe Stream, New Zealand, exhibited significant changes in life history traits following supplementation releases of hatchery-reared juveniles. Total run strength did not change but the proportion of naturally produced fish declined to 34%. Attempts to separate spawners of natural and hatchery origin were unsuccessful, and 31-48% of natural spawners are now of hatchery origin. Hatchery males were smaller at age 2 and 3 than males of natural origin, and more often matured as jacks, producing an 86-mm decrease in mean fork length over 28 years. There was no change in length at age or age at maturity for female spawners. The proportion of jacks entering Glenariffe Stream each year was positively correlated with the proportion of jacks in the ensuing cohort. Most differences between fish of natural and hatchery origin were related to hatchery rearing practices, but the decline in age at maturity among naturally produced males appears to reflect traits inherited from parent stock of hatchery origin. Hatchery releases may also favour the survival of ocean-type fry over stream-type fry, possibly reversing a tendency for stream-type behaviour to evolve in response to the lack of estuaries on most New Zealand chinook salmon rivers.

Life History of Juvenile Ocean-type Chinook Salmon (Oncorhynchus tshawytscha) in the Situk River, Alaska

1992 ◽  
Vol 49 (12) ◽  
pp. 2621-2629 ◽  
Author(s):  
S. W. Johnson ◽  
J. F. Thedinga ◽  
K. V. Koski
Keyword(s):  
Life History ◽  
Chinook Salmon ◽  
Habitat Preference ◽  
Oncorhynchus Tshawytscha ◽  
Fork Length ◽  
Main Stem ◽  
Seawater Tolerance ◽  
History Of ◽  
Two Phases ◽  
Stream Type

Distribution, abundance, habitat preference, migration and residence timing, seawater tolerance, and size were determined for juvenile ocean-type (age 0) chinook salmon (Oncorhynchus tshawytscha) in the Situk River, Alaska. Chinook primarily occupied main-stem habitats (channel edges in spring, pools and willow edges in summer). Peak chinook densities in the upper and lower main stem were 96 and 76 fish/100 m2, respectively. Chinook migrated downstream in two phases: a spring dispersal of emergent fry and a summer migration. Chinook marked in the upper river in late June and early July were recaptured 20 km downstream in the lower river in late July. Marked chinook resided in the lower river up to 34 d. Mean fork length of chinook in the lower river increased from 40 mm in May to 80 mm in early August. By late August, chinook had emigrated from the lower river at a size of approximately 80 mm. Fish this size were seawater tolerant and had the physical appearance of smolts. Ocean-type chinook in the Situk River are unique because in most Alaskan streams, chinook are stream-type (rear in freshwater at least 1 yr).

Variation in Life History Patterns among New Zealand Chinook Salmon (Oncorhynchus tshawytscha) Populations

1993 ◽  
Vol 50 (7) ◽  
pp. 1414-1421 ◽  
Author(s):  
Thomas P. Quinn ◽  
Martin J. Unwin
Keyword(s):  
Life History ◽  
New Zealand ◽  
Chinook Salmon ◽  
Life History Traits ◽  
Oncorhynchus Tshawytscha ◽  
Local Conditions ◽  
Median Date ◽  
Timing Of Entry ◽  
Genetic And Environmental Factors ◽  
Size At Age

Chinook salmon (Oncorhynchus tshawytscha) were introduced to New Zealand, apparently from a single California population, and have been self-sustaining since about 1905. Salmon from the Waimakariri, Rakaia, Rangitata, and Waitaki rivers differed in various life history traits. The proportion of stream-type adults ranged from 29.1 to 75.6% in Rakaia and Waimakariri tributaries, respectively. Average age at maturity not only differed among the major rivers but also between two tributaries within the Rakaia River catchment. Length at age varied among rivers, the differences being most pronounced in older fish. Age structure and size at age combined to produce 91-, and 73-mm differences in mean length of males and females, respectively, among populations. Waitaki River salmon were not only long at age but also heavier for their length than other populations. The timing of entry into freshwater varied by over 1 mo between the Rakaia and Waitaki rivers, and median date of arrival on spawning grounds varied by 16 d between Rakaia and Waimakariri river tributaries. These life history traits are influenced, to varying degrees, by genetic and environmental factors. However, the suite of differences indicates that considerable adaptation to local conditions has occurred in about 20 generations.

scholarly journals Heritability and Y-chromosome influence in the jack male life history of chinook salmon (Oncorhynchus tshawytscha)

Heredity ◽  
2002 ◽  
Vol 89 (4) ◽  
pp. 311-317 ◽  
Author(s):  
D D Heath ◽  
L Rankin ◽  
C A Bryden ◽  
J W Heath ◽  
J M Shrimpton
Keyword(s):  
Life History ◽  
Y Chromosome ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
History Of ◽  
Male Life History

The effects of domestication on the relative vulnerability of hatchery and wild origin spring Chinook salmon (Oncorhynchus tshawytscha) to predation

2007 ◽  
Vol 64 (5) ◽  
pp. 813-818 ◽  
Author(s):  
Anthony L Fritts ◽  
Jennifer L Scott ◽  
Todd N Pearsons
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Chinook Salmon ◽  
First Generation ◽  
Oncorhynchus Tshawytscha ◽  
State Of The Art ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Salmon Fry ◽  
History Of ◽  
Relative Vulnerability

We tested whether one generation of state-of-the-art hatchery culture influenced the vulnerability of Chinook salmon (Oncorhynchus tshawytscha) fry to predators. Size-matched hatchery and wild origin spring Chinook salmon fry were exposed to rainbow trout (Oncorhynchus mykiss) and torrent sculpin (Cottus rhotheus) predators in 10.8 m3 net pens. The hatchery origin fry were the offspring of first generation hatchery-reared broodstock, and the wild origin fry had no history of hatchery culture; both originated from the same stock. Wild origin fry were found to have a 2.2% (p = 0.016) survival advantage over hatchery origin fry during 2 years of predation challenges. The most important findings of this study are (i) domestication can affect the susceptibility to predators after only one generation of state-of-the-art hatchery culture practices, and (ii) the domestication effect was very small.

Using near infrared spectroscopy to assess the composition of New Zealand aquaculture species

NIR news ◽  
2018 ◽  
Vol 29 (5) ◽  
pp. 12-14
Author(s):  
Matthew R Miller ◽  
Jonathan Puddick ◽  
Jane E Symonds ◽  
Seumas P Walker ◽  
Hong (Sabrina) Tian
Keyword(s):  
Infrared Spectroscopy ◽  
New Zealand ◽  
Near Infrared Spectroscopy ◽  
Chinook Salmon ◽  
Proximate Composition ◽  
Near Infrared ◽  
Oncorhynchus Tshawytscha ◽  
Society Meeting ◽  
Perna Canaliculus

Near infrared spectroscopy has been employed to determine the proximate composition of Chinook salmon ( Oncorhynchus tshawytscha) and Greenshell Mussels™ ( Perna canaliculus). This work was presented at the Australian Near Infrared Spectroscopy Group and New Zealand Near Infrared Spectroscopy Society meeting in Rotorua, 11–12 April 2018, where it won the best overall presentation award for Near Infrared Science (Figure 1).

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