. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EFFECT OF SALINITY ON SHRIMP GROWTH 191 these reasons, brine shrimp nauplii constituted the sole dietary supply in the salinity experiments described. Laboratory cultures of brine shrimp were filtered and washed before use in order to avoid salinity changes in the experimental tanks caused by the addition of saline (brine shrimp) culture medium. Equal amounts of brine shrimp were given to postlarvae in all tanks. The volume and number of feedings per day were increased during the experiment in order to maintain an excess of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. EFFECT OF SALINITY ON SHRIMP GROWTH 191 these reasons, brine shrimp nauplii constituted the sole dietary supply in the salinity experiments described. Laboratory cultures of brine shrimp were filtered and washed before use in order to avoid salinity changes in the experimental tanks caused by the addition of saline (brine shrimp) culture medium. Equal amounts of brine shrimp were given to postlarvae in all tanks. The volume and number of feedings per day were increased during the experiment in order to maintain an excess of food in the tanks. Although all the shrimp in series GS-1 (April, 1962) were tentatively identi- fied as grooved shrimp, , brown shrimp or pink shrimp, those obtained for GS-2 (July, 1962) apparently included both "grooved" and white shrimp in an approximate ratio of five grooved to one white. Tentative species identification was made following Williams (1959), with early postlarvae (less than 10 mm. rostrum-telson length) being differentiated on the basis of ratio of distance from rostrum to eye and distance from third pereiopod to eye, and specimens longer than 17 mm. on the basis of the presence or absence of a groove. Conflicting evi- dence is available concerning identification at lengths between 10 and 17 mm. Thus, identification must be regarded as tentative, although some confirmation of species ratio was available from the animals surviving for 30 days. 200 r- 180 100 140 I- 120 I LU ~ 5 2 < LU 100 80 60 40 P (34) O I 0 %o D 25%0 x 40 %o. 10 15 NUMBER OF EXPERIMENTAL 2O DAYS 25 30 FIGURE 2. Growth of postlarval penaeids at various salinity levels in series GS-1. Figures in parentheses indicate percent survival at termination of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original w
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
