7122

• UCREFRP Catalog Number: 7122
• Author: Maxfield, G. H., R. H. Lander and K. L. Liscom
• Title: Survival, growth, and fecundity of hatchery-reared rainbow trout after exposure to pulsating direct current
• USFW Year: 1971
• USFW - Doc Type: Transactions of the American Fisheries Society
• Copyright Material: YES

alb TRANS. AMER. FISH. SOC., 1971, NO. 3
TAME 2-Total counts and cumulative rates of survival of test and control rainbow trout from 1952 and 1953
year classes, Tune 1953 through December 1955
1952 year class 1953 year class
Number of fish Cumulative survival Number of fish Cumulative survival
Date of Test Control Test Control Test Control Test Control
observation (%) (%)
1953
11 Jm
14 October a25
- 506 100 100 954 - 275 100 100

15 October
8I9 -
500
99.2
98.9 8562
- 2442
- 100=
- 1002
-
t
1954 r
22 March
25 April -
799 -
484
96.8
95.6 844
- 234

- 98.6 95.6
9 November 762 458 92.9 89.6 - -
10 November - - - - 792 226 92.6 92.7
1955
18 my
28 -'
- - - - 771 213 90.1 87.3

17 ber
- - - - 2362 213 90.1 87.3
- - - 236 205 90.1 84.0
r All test and control fish were alive after electroshock on 9-10 June 1953.
2 A new reference was established for the 1953 year class on 14 October 1953. Some mortalities occurred after June 11
bot were not enumerated; 29 fish were discarded on 14 October because they could not be identified as test or mutrol fi
h
s
from their marks. A. additional mark was made so that identification of the experimental fish would be ensured.
ApprurimAtely two-thirds of the test fish were discarded at random on 18 July 1955, to adjust the number of test fish
to the number of control fish and facilitate handling at spawning time.
were routine except for sorting and identifica• lot was estimated by Burrow's (1951) water
tion of the experimental fish and their eggs. displacement method of egg enumeration. At
The females that were spawned were those least five 50-egg samples were taken at random
from which all the eggs could be extruded from each egg lot to determine the number of
in the opinion of station personnel. All the eggs per ounce. Test and control lots of eggs
ripe test fish were spawned on one day, and were alternated when placed in the troughs
the ripe control fish on the next day. for incubation so that an), influence of the
The eggs from each spawning of the test trough or water supply would be offset
The
and control fish were put in a hatching basket .
eggs were given a treatment of 1:200,000 parts
and given an identifying lot number based on of malachite green for 1 hour every other day
the trough number and location of the basket for control of fungus.
in the trough. The number of eggs in each Egg losses were counted for each lot: (1)
TAM 3.-Average total length, average weight, and (in parentheses) sample'size of random samples of test
and control rainbow trout from the 1952 and 1953 year classes, May 1953 through December 1955
1952 year class 1953 year class
Total length (mm) Weight (g) Total length
Dohs (mm) Weight (g)
observation Test Control Test Control Test Control Test Control
1953
26 27 Mir 191(823) 189(506) 72(825) 68(506) - - -
15 J?

14 October 210(100

_ ) 210(65
)
_
=
48(100)
70(132)
46(100)
71(50)
15 October 253(200) 252(100) _
181(150) 186(50) 109(300) 110(100) 13(300) 13(244)
1954
23 March
9 November 317 200)
392100 320 100)
5 344(175) 344(98) 157(844) 159(234) - -
-
' 10 November )
- 40
100)
- 721(50) 833(50) _ _
- - 275(150) 286(75) 213(150) 240(75)
1955
18 »ly
1 - 522
7

9
-
-
-
-
425(235)
419(205) (
06) 526(109)
861(235) 820(205)
r Data taken an all test end control fish.
MAXFIELD ET AL.-PULSATING DIRECT CURRENT EFFECT ON TROUT
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