A Fry Trap Method for Estimating Salmonid Survival from Egg Deposition to Fry Emergence

1969 ◽  
Vol 26 (1) ◽  
pp. 133-141 ◽  
Author(s):  
Robert W. Phillips ◽  
K. V. Koski
Keyword(s):  
Dissolved Oxygen ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Field Tests ◽  
Accurate Estimate ◽  
The Past ◽  
Egg Deposition

The method involves a trap of nylon netting placed over an individual redd with the trap's edges buried 15–20 cm in the gravel just outside the periphery of the redd. It has been used successfully on more than 70 coho salmon (Oncorhynchus kisutch) redds over the past 5 years, with as many as 2061 fry being captured from a single redd. The trap is relatively stable because it is flexible and conforms to the surface of the streambed, causing debris to float or roll over the surface. It can be used on individual redds; thus, emergent survival for separate parental combinations can be estimated. Field tests showed the efficiency of the trap approached 100%. Installation and presence of the trap had no significant effect on intragravel dissolved oxygen and gravel permeability. Mortality of fry in the traps averaged less than 1.5% when fry were removed at least three times a week. We concluded that the trap provides a more accurate estimate of survival from egg deposition through fry emergence than four other methods.

Ontogenetic Variation in the Multiple Hemoglobins of Coho Salmon (Oncorhynchus kisutch) and Effect of Environmental Factors on Their Expression

1976 ◽  
Vol 33 (5) ◽  
pp. 1144-1149 ◽  
Author(s):  
M. A. Giles ◽  
W. E. Vanstone
Keyword(s):  
Environmental Factors ◽  
Dissolved Oxygen ◽  
Gel Electrophoresis ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Yolk Sac ◽  
Ontogenetic Variation ◽  
Starch Gel Electrophoresis ◽  
Electrophoretic Patterns ◽  
Starch Gel

Hemolyzates from the blood of coho salmon (Oncorhynchus kisutch) at various stages of development were subjected to micro-starch-gel electrophoresis. Three distinct electrophoretic patterns composed of different combinations of 18 hemoglobin tetramers were observed. Embryonic and yolk-sac alevins possessed 1 cathodic and 12 anodic components while fry retained only 3 of the 12 anodic polymorphs. During smoltification, 4 new cathodic components appeared and 2 of the anodic and the cathodic components of alevin hemolyzates reappeared. This latter pattern was retained until the fish spawned and died. Attempts to induce changes in the pattern of development of these hemoglobins by exposing fry and pre-smolts to extreme variations in dissolved oxygen, temperature, and salinity were completely unsuccessful.

Estimates of stream residence time and escapement based on capture-recapture data

2000 ◽  
Vol 57 (1) ◽  
pp. 241-246 ◽  
Author(s):  
Micheline Manske ◽  
Carl J Schwarz
Keyword(s):  
Residence Time ◽  
Coho Salmon ◽  
Area Under The Curve ◽  
Oncorhynchus Kisutch ◽  
Accurate Estimate ◽  
Small River ◽  
Entire Population ◽  
Residence Times ◽  
Capture Recapture ◽  
Curve Method

The area-under-the-curve method is a widely used method for estimating salmon escapement. The method depends on obtaining an accurate estimate of stream residence time, or stream life. This paper develops an estimator of stream residence time based on capture-recapture data. If the capture-recapture experiment is performed on the entire population, the escapement can also be estimated using the area-under-the-curve method. Simulations showed that the stream residence estimator and the area-under-the-curve estimator provide precise estimates of stream residence and escapement, respectively. These methods were used to estimate the stream residence times and escapements of coho salmon (Oncorhynchus kisutch) in a small river on Vancouver Island in 1989 and 1990.

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

Aquaculture ◽  
1981 ◽  
Vol 26 (1-2) ◽  
pp. 117-127 ◽  
Author(s):  
George A. Hunter ◽  
Edward M. Donaldson ◽  
Helen M. Dye
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Induced Ovulation

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

1976 ◽  
Vol 33 (12) ◽  
pp. 2699-2702 ◽  
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.

scholarly journals Hyperbilirubinemia of Coho Salmon Oncorhynchus kisutch Infected with Erythrocytic Inclusion Body Syndrome (EIBS) Virus

1994 ◽  
Vol 60 (5) ◽  
pp. 519-521 ◽  
Author(s):  
Tadashi Sakai ◽  
Hisashi Murata ◽  
Kiyoshi Yamauchi ◽  
Kiyotaka Takahashi ◽  
Nobuaki Okamoto ◽  
...  
Keyword(s):  
Inclusion Body ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch
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