. Culture methods for invertebrate animals;. Invertebrates -- Cultures and culture media; Invertebrates -- Collection and preservation. Homaridae 235 moves forward by means of the swimmerets and darts backward by sudden jerks of the abdomen. It measures between n and 14 mm. All the traces of larval swimming organs disappear after the 6th molt. The ensuing molts follow at rather short intervals. It has been estimated that during the first year the lobster molts from 14 to 17 times and attains a length of from 2 to 3 inches. The first three stages comprise the most critical period of the larval
. Culture methods for invertebrate animals;. Invertebrates -- Cultures and culture media; Invertebrates -- Collection and preservation. Homaridae 235 moves forward by means of the swimmerets and darts backward by sudden jerks of the abdomen. It measures between n and 14 mm. All the traces of larval swimming organs disappear after the 6th molt. The ensuing molts follow at rather short intervals. It has been estimated that during the first year the lobster molts from 14 to 17 times and attains a length of from 2 to 3 inches. The first three stages comprise the most critical period of the larval life of the lobster. The natural food of the larvae probably consists of pelagic copepods and other crustaceans. In the hatching tanks they display strong cannibalistic tendencies, usually attacking their victims from above and nipping into the abdomen at its junction with the cara- pace. The self-destructiveness of the larvae constitutes the greatest diffi- culty in rearing them under artificial conditions. The best method of overcoming this consists in preventing the aggregation of the larvae on the bottom and by keeping them afloat. This is accomplished by a con- tinuous stirring of the water by means of a propeller (P) operated by an electric motor (not shown in Fig. 47).. Fig. 47.—Method of hatching and rearing lobsters. A, hatching jar; P, propeller; S, screen; T, tank. Experiments carried out by the author at Woods Hole prove that boiled and dried fish is the best food for the larvae. A whole fish is cut in several pieces and boiled in freshwater for about 30 minutes, then. 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 Galtsoff, Paul Simon, 1887-. update forthcoming
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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
