. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 164 A. C. BROAD 100- 80- 60- Z 40' 20-. NO FOOD UNICELLULAR AL NON-LIVING ANIM ALGAE PLUS AN^ ARTCUIA NAUPLII I 2 3 MOLT NUMBER 100- 60 - O 5 20 UNICELLULAR ALGAE * ALGAE PLUS ANIMAL - ARTEMIA NAUPLII I 2 3 MOLT NUMBER FIGURE 1. Mortality at each of the first seven molts among Palaemonetes pugio larvae fed various diets. Per cent mortality at each molt is based on the number of larvae which survived the last molt. FIGURE 2. Mortality at each of the first seven molts among Palaemonetes vulgaris larvae fed various diets. Per c
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 164 A. C. BROAD 100- 80- 60- Z 40' 20-. NO FOOD UNICELLULAR AL NON-LIVING ANIM ALGAE PLUS AN^ ARTCUIA NAUPLII I 2 3 MOLT NUMBER 100- 60 - O 5 20 UNICELLULAR ALGAE * ALGAE PLUS ANIMAL - ARTEMIA NAUPLII I 2 3 MOLT NUMBER FIGURE 1. Mortality at each of the first seven molts among Palaemonetes pugio larvae fed various diets. Per cent mortality at each molt is based on the number of larvae which survived the last molt. FIGURE 2. Mortality at each of the first seven molts among Palaemonetes vulgaris larvae fed various diets. Per cents computed as for P. pugio (Fig. 1). to improve survival or molting in either 280 P. pugio or 100 P. vulgaris larvae. The survival of algae-fed larvae shown in Figures 1 and 2 closely approximates that of starved larvae. Larvae that were fed foods of animal origin, either living or non-living, alone or in combination with algae, were able to survive through metamorphosis in the laboratory. The mortality of 608 P. pugio larvae that were fed diets of non-living animal matter, mostly zooplankton, combined with phytoplankton cells is shown by the dash-and-two-dots line in Figure 1. Sixteen of these individuals meta- morphosed. The dash-and-dot line in Figure 1 shows the mortality of 732 P. pugio larvae that were fed non-living animal matter alone. In general the two curves are alike. Both reflect, in peaks at the second molt, the ability of this species to survive a single molt without food. Only 6 individuals metamorphosed on a diet of freshly killed zooplankton or other non-living animal matter. By far the best survival was shown by larvae fed living Artemia nauplii. The mortality of 100 of these is shown by the dotted line in Figure 1. Sixty-five individuals survived metamorphosis. Another 40 P. pugio larvae, for which it was not possible to determine daily the state of development of each individual, were fed living Artemia nauplii. Mortality at each molt of these individual
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
