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Genotype-dependent survival, growth, and production in cultured blue mussels, Mytilus SPP.: results of a reciprocal seed transfer experiment.
From:
Journal of Shellfish Research
| Date:
August 1, 2006| Author:
| COPYRIGHT 2006 National Shellfisheries Association, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group.Copyright information
|
ABSTRACT A reciprocal mussel seed transfer experiment was conducted involving two farm sites (Charles Arm and Thwart island) whose seedstocks differed significantly in their respective compositions of Mytilus edulis L., M. trossulus Gould and hybrids. Electrophoretic variation at the mannose phosphate isomerase (Mpi) enzyme locus was used to classify the two species and their hybrids. Survival and growth in shell length, wet weight, shell weight and flesh weight were monitored over a 14-mo period. Both stock groups originating from Thwart Island seed (TI reared on its native site ...
<0.001). After 14 mo, the frequencies of M. edulis, M. trossulus and their hybrids were 70.2%, 20.4% and 9.4% in the CA-X stock; 48.3%, 35.0% and 16.7% in the TI stock and 57.5%, 23.1%, and 19.4% in the TI-X stock respectively. However, these frequency changes of Mytilus genotypes over the 14-too growout period in the CA-X, TI and TI-X stocks were not significant compared with their respective initial Charles Arm or Thwart Island seedstock ([chi square], P>
<0.05 (Tukey multiple range test).
Variable
Shell Wet Shell Flesh
Stock Length Weight Weight Weight
(a)
CA 26.42 (a) 1.28 (a) 0.45 (a) 0.82 (a)
TI 21.53 (b) 0.81 (b) 0.32 (b) 0.50 (b)
(b) CA
M. edulis 26.29 (a) 1.27 (a) 0.45 (a) 0.82 (a)
Hybrid 26.30 (a) 1.24 (a) 0.44 (a) 0.80 (a)
M. trossulus 28.37 (a) 1.48 (a) 0.52 (a) 0.96 (a)
(c) TI
M. edulis 21.07 (a) 0.76 (a) 0.31 (a) 0.45 (a)
Hybrid 20.53 (a) 0.67 (a) 0.27 (a) 0.41 (a)
M. trossulus 23.49 (b) 1.05 (b) 0.37 (a) 0.68 (b)
TABLE 2.
Analysis of variance (ANOVA) test results for species
(M. edulis, hybrid, and M. trossulus) and stock (CA,
CA-X, TI, and TI-X) variation over the 14-month growout
period for shell length, wet weight, shell weight, and
flesh weight.
F Value
Sp. x Time
([double
Variable Species Stock Time dagger])
Shellen 7.76 ** 60.58 *** 5403.99 *** 25.81 ***
Wetwgt 4.79 ** 15.42 *** 5257.92 *** 64.28 ***
Shellwgt 3.24 * 11.08 *** 5479.08 *** 93.39 ***
Fleshwgt 5.65 ** 17.71 *** 4470.41 *** 38.21 ***
F Value
Stk. X
Sp. x Stk. Stk. x Time Sp. x Time
([double ([double ([double
Variable dagger]) dagger]) dagger]) [R.sup.2]
Shellen 1.32 19.92 *** 1.99 0.69
Wetwgt 0.96 75.71 *** 5.68 *** 0.70
Shellwgt 0.74 96.29 *** 8.46 *** 0.72
Fleshwgt 1.17 53.53 *** 3.45 ** 0.66
Numbers without superscript are not significantly different,
P>
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