Assessment of genetic diversity in Coho salmon (Oncorhynchus kisutch) populations with no family records using ddRAD-seq

California coho salmon (Oncorhynchus kisutch) are under legal protection owing to significant declines in abundance over the last decades. Previously, California coho salmon were characterized as having low genetic diversity and weak population subdivision, attributable potentially to homogenization by out-of-basin hatchery releases. Here, diversity at seven highly polymorphic microsatellite DNA markers is assessed within and among 32 collections of coho salmon from 16 California watersheds. In 71% of local populations, genotypic composition deviates significantly from that expected under the assumption of random mating. We develop and apply methods to adjust for two potential causes of deviation from random mating expectations: (i) Wahlund effects, owing to heterogeneous collections of individuals, and (ii) the "Allendorf–Phelp's effect", owing to closely related juveniles in samples. Such population-level "adjustments" reduce within-region and increase among-region variance; after adjustment, we find strong concordance of genetic and geographic distances. We conclude that stock transfers have had minimal impact on population structure and that California coho salmon populations likely comprise small numbers of endemic breeders, potentially experiencing high levels of genetic drift and inbreeding.

Download Full-text

Comparative Mapping Between Coho Salmon (Oncorhynchus kisutch) and Three Other Salmonids Suggests a Role for Chromosomal Rearrangements in the Retention of Duplicated Regions Following a Whole Genome Duplication Event

G3 Genes|Genome|Genetics ◽

10.1534/g3.114.012294 ◽

2014 ◽

Vol 4 (9) ◽

pp. 1717-1730 ◽

Cited By ~ 37

Author(s):

M. Kodama ◽

M. S. O. Brieuc ◽

R. H. Devlin ◽

J. J. Hard ◽

K. A. Naish

Keyword(s):

Comparative Mapping ◽

Whole Genome Duplication ◽

Genome Duplication ◽

Coho Salmon ◽

Chromosomal Rearrangements ◽

Oncorhynchus Kisutch ◽

Duplication Event ◽

Whole Genome ◽

Genome Duplication Event ◽

Whole Genome Duplication Event

Download Full-text

Efficacy of environmental DNA sampling to detect the occurrence of endangered coho salmon ( Oncorhynchus kisutch ) in Mediterranean‐climate streams of California's central coast

Environmental DNA ◽

10.1002/edn3.175 ◽

2020 ◽

Author(s):

Brian C. Spence ◽

David E. Rundio ◽

Nicholas J. Demetras ◽

Maryna Sedoryk

Keyword(s):

Mediterranean Climate ◽

Coho Salmon ◽

Oncorhynchus Kisutch ◽

Environmental Dna ◽

Central Coast ◽

Dna Sampling

Download Full-text

Induced ovulation in coho salmon (Oncorhynchus kisutch). I. Further studies on the use of salmon pituitary preparations

Aquaculture ◽

10.1016/0044-8486(81)90115-0 ◽

1981 ◽

Vol 26 (1-2) ◽

pp. 117-127 ◽

Cited By ~ 19

Author(s):

George A. Hunter ◽

Edward M. Donaldson ◽

Helen M. Dye

Keyword(s):

Coho Salmon ◽

Oncorhynchus Kisutch ◽

Induced Ovulation

Download Full-text

Effects of selenium dietary enhancement on hatchery-reared coho salmon, Oncorhynchus kisutch (Walbaum), when compared with wild coho: hepatic enzymes and seawater adaptation evaluated

Aquaculture Research ◽

10.1111/j.1365-2109.1996.tb00977.x ◽

1996 ◽

Vol 27 (2) ◽

pp. 135-142 ◽

Cited By ~ 25

Author(s):

S P Felton ◽

M L Landolt ◽

R Grace ◽

A Palmisano

Keyword(s):

Coho Salmon ◽

Oncorhynchus Kisutch ◽

Hepatic Enzymes ◽

Seawater Adaptation

Download Full-text

Physiological Response of Juvenile Coho Salmon (Oncorhynchus kisutch) and Rainbow Trout (Salmo gairdneri) to Handling and Crowding Stress in Intensive Fish Culture

Journal of the Fisheries Research Board of Canada ◽

10.1139/f76-320 ◽

1976 ◽

Vol 33 (12) ◽

pp. 2699-2702 ◽

Cited By ~ 100

Author(s):

Gary A. Wedemeyer

Keyword(s):

Rainbow Trout ◽

Feeding Behavior ◽

Coho Salmon ◽

Physiological Stress ◽

Oncorhynchus Kisutch ◽

Fish Distribution ◽

Salmo Gairdneri ◽

Crowding Stress ◽

Normal Feeding ◽

Intensive Fish Culture

Moving 4–5-in. coho salmon (Oncorhynchus kisutch) held in soft (20 ppm CaCO3) water from the relatively light loading density of 0.5 lb/ft3 to 1, 2, or 4 lb/ft3 (density index, DI = 0.1, 0.2, 0.4, 0.8) caused significant stress as indicated by loss of feeding behavior, but only minimal physiological disturbances, as indicated by lack of hyperglycemia or hypochloremia. However, moving them to 6 or 12 lb/ft3 (DI = 1.2, 2.4) caused significant physiological stress which required at least a week for recovery. Smolting coho salmon were physiologically stressed by population densities of 1 lb/ft3 or more and a subclinical corynebacterial kidney infection was activated. Rainbow trout (Salmo gairdneri) (4–5 in.) were physiologically stressed when moved and held at 1 lb/ft3 or more but retained normal feeding behavior. This indicates that handling and crowding stress will be minimized in softwater areas if densities in fish distribution trucks or in ponds or raceways during disease treatments are held to 0.1–0.5 lb/gal.

Download Full-text