Nest IJo » 2 (in racevray) : — Spavminc Tras completed in thic nest 

 on June 30^ 19ll7. The fenale, 17.0 inches long, had a potential 

 egg production of ^8,700 eggn. The folloiving nxxmbers of larvae 

 left the nest and Trero talcen in the trap on the following dates: 

 3 on July 18, hi on Julj-- 19, 1^0 on July 20, and 22 on July 21 j 

 total — 222 individuals. Larv^al production constituted O.k percent 

 of the reproductive potential of the fenale. 



Nest No . 3 (in small enclosure outside of raceway): — Spairvning 

 •vyas completed on Jime 30, l^U?. The female, 1^.0 inches long, had 

 a potential egg production of l!.6,050 eggs. The follo^Adng numbers 

 of larvae left the nest and vrere trapped on the follov/ing dates: 

 1 on July 13, 109 on July 19, 20U on July 20, and 7 on July 21; 

 total — 321 individuals. Larval production amounted to 0.7 percent 

 of the reproductive potential of this female. 



The foregoing estimates of larval production, lov; as they 

 seem, may even be someivhat above the average production. Water 

 currents, sloiTer than average at the experimental nesting sites, 

 probably did not siveep as many neiTly-ejctruded eggs over and beyond, 

 the nest as often occurs. In addition, certain small fishes which 

 can and do prey upon extruded eggs during the spavming act ATere 

 excluded from •the nesting sites. 



Attempts to duplicate these experiments in 19l|.3 were unsuc- 

 cessful due to my inability to select a pair, both individuals of 

 which were ready to spaivn on the same date. Until such time Tjhen 

 additional experiments are conducted, the larval production 

 figures presented must be considered only indicative of tlie pro- 

 ductivity of the species. 



All recently-hatched larvae trapped from Nest No. 2 (222 

 individuals) were measured vri.th an ocular micrometer in a com- 

 pound, binocular microscope, licrometer measurements were con- 

 verted to millimeter units with the aid of a stage m-icrometer. 

 These larvae -vi^Lich had just burroived out of, and left, the nest 

 ranged from 6.2^ millimeters to 9.75 millimeters in total length 

 and averaged 8,5U millimeters long. Their average age, dating 

 from fertilization of the eggs, vfas 20 daj/'s. The distribution of 

 the lengths of these individuals is presented as a frequency polygon 

 in Figure ^0. 



Distribution in the Ocqueoc River , larval 



habitats , and population densities 



The upper third of ti'-e Ocqueoc River is a region of sluggish 

 currents, muckj^ bottoms, and considerable aquatic plajit groTith 

 (Figure 28, Zone 3). No spaivning occurs here. The central third 

 of the watershed is characterized by long, continuous riffles of 

 rook, rubble, and gravel interspersed with shallow pools (Figure 

 28, Zone 2). The lovrer third, below the Ocqueoc Falls, is at first 



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