File:American malacological bulletin (1988) (17535947583).jpg

Title: American malacological bulletin
Identifier: americanmal6719881990amer (find matches)
Year: 1983 (1980s)
Authors: American Malacological Union
Subjects: Mollusks; Mollusks
Publisher: (Hattiesburg, Miss. ?) : (American Malacological Union)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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24 AMER. MALAC. BULL.
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Fig. 2. Freshly laid egg clusters entwined around a central stalk, and at bottom 50-day-old eggs suspended inside a flower pot. Fig. 3. Egg development. From top to bottom: newly laid egg with embryo forming at right; octopus embryo before second inversion (45 days old); and dorsal and ventral views of octopus after second inversion (50 days old). Fig. 4. Hatching sequence. From left to right: egg capsule is split at posterior end; octopus squeezing its mantle out; only the arms remaining inside the egg capsule; newly hatched octopus. Fig. 5. Female octopus brooding eggs in the protective posture ( Comp. 24). analyses of the 1973 and 1981 data. Collectively, these length measurements indicate growth rates of 1.5 to 1.9% increase in body length per day during the exponential phase (d1-126), and progressively slower rates during the logarithmic phase until senescence begins. Analysis of wet weight increases in the 1975, 1981 and 1983 data (n = 41) revealed that growth was clearly exponen- tial for the first 18 - 20 weeks under laboratory conditions (Fig. 11). Clearly, growth remains rapid over a long period. After 18 - 20 weeks, growth was best described by the logarithmic equation form. Full details of the 1983 weight data are given in table 2. Figure 12 illustrates changes in growth rates deter- mined over short intervals. The highest growth rates occurred between weeks four and eight and there was an inexplicable cyclic pattern of increasing and decreasing rates during the first eight weeks. Overall, the mean growth rate over the first 18 - 20 weeks was 4.8% increase in body weight per day, which coincided well with the growth rate exponents of 4.6

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