Experimental Study of the Growth And Migration of Fresh-Water Mussels

Cover Experimental Study of the Growth And Migration of Fresh-Water Mussels
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AVERAGES FOR ONE YEAR.
Species.
Average Average increase Average weight.
in length.
weight.
Grams.
Grams.
Mm.
100 30.8 70 '124 28 82 74 11.4 68.8 67 11.5 60 194 48.6 128 28 8.5 67 Average Increase in length.
Lachrymosa (maple-leaf) Unduiata (three-ridge) Rubiginosa Pustulosa (warty-back or pimple-back) .
Grandis o (floater) Tetralasmus b Mm, l.h 7.2 3.4 2.7 5 4 AVERAGES FOR THREE SUMMER MONTHS.
Gracilis (paper-shell) AnodontoidTes (yellow sand-shell) .
22.5 4.5 o Large mature specimens, still t
...he lncrea.se is good.
b In an unusual environment lor this species (p. 9).
Juvenile Quadrulae " of the above species double in size in a year, as shown by a number of examples (149, 158, 349, 323, in table 1; 281, 564, 413, in table 8). Averages here given and those taken from other sources indicate that a 100-gram, 75-millimeter unduiata (three-ridge) (p. 14) or lachrymosa (maple-leaf) can develop in the Shoofly in about four years (averages for tables 1, 2, 4, and 5). A 300-gram specimen of unduiata (three-ridge) or lachrymosa (maple- leaf) would doubtless be close to 15 years old.


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