File:California fish and game (20487070066).jpg

Title: California fish and game
Identifier: californiafishga38_4cali (find matches)
Year: [1] (s)
Authors: California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game
Subjects: Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons
Publisher: (San Francisco, etc. ) State of California, Resources Agency, Dept. of Fish and Game
Contributing Library: California Department of Fish and Game
Digitizing Sponsor: Internet Archive

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592 CALIFORNIA FISH AND GAME of the jar. Occasionally they swim upwards, then lie still and sink down- ward again. This sinking downwards and swimming upwards is repeated over and over again. The growth rate of the prolarval and early postlarval sardine is given in Figure 5. The yolk sac was used up in three days at 16.8° C. and in 2i davs at 22.2° C. Manv larvae died soon after the volk material was
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FIGURE 5. Growth of the sardine larvae at 16.8° C. and 22.2° C. Lines drawn through means of groups at each sample. absorbed, but those remaining showed a steady increase in total length up to the fifth day after which time there was a progressive decrease for larvae held at both temperatures (Figure 5). This phenomenon of larval fish decreasing in total length after the absorption of the yolk material has been noted by several authors such as Orcutt (1950), who observed this same decrease in total length of larval starry flounder (Platichthys stel- latus). In the newly hatched larvae there are two dorsal rows of pigment spots parallel to each other, one on either side of the notochord. This pigment migrates downward along the sides soon after hatching and accumulates anteriorh^ over the gut and optic lobes and posteriorly in a position under the gut and in the lower caudal fin fold. This migration of the melano- phores is illustrated in Figures 6-9. In Figure 6, a 24-hour larva, the den- dritic melanophores can be seen migrating downward in the caudal region and anteriorly about a third of the distance between the anal pore and the posterior edge of the yolk sac. Under bright illumination this pigment is brownish-yellow in color. The extremities of the dendrites are very deli- cate, forming a reticulate netw^ork over the dorsal surface of the somites and out onto the nape, interorbital space and nasal pit areas of the head region. As migration proceeds these dendritic arms of pigment become compact and tend to form dark blotches over the lateral surfaces of the

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