. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. 70 Bulletin So. Calif. Academy Sciences / Vol. 66, No. i, 1^6'] taining approximately 50 locally-caught pinfish ranging in size from about 4 to 7 inches (about 10 to 18 cm.) in total length. In defense of territories consisting of small rocks on the bottom of the tank, several of the larger fishes were actively chasing other pinfish of different sizes which invaded or strayed into their realms. At 8 , with the tank brightly lighted by overhead artificial lights, we began to record and foun
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. 70 Bulletin So. Calif. Academy Sciences / Vol. 66, No. i, 1^6'] taining approximately 50 locally-caught pinfish ranging in size from about 4 to 7 inches (about 10 to 18 cm.) in total length. In defense of territories consisting of small rocks on the bottom of the tank, several of the larger fishes were actively chasing other pinfish of different sizes which invaded or strayed into their realms. At 8 , with the tank brightly lighted by overhead artificial lights, we began to record and found that sharp "clicking" sounds were being made in the tank which could positively be correlated with the pinfish chases. These sounds were of three general types, all very similar to our ears and on spectrographic analysis (Figs. 1 to 3). The most common of the 12 10 8 m6 a: ^0 0 TIME (SEC.) Figure 1. Rapid-onset, broad-band "clicking" sound produced underwater appar- ently by the defending pinfish, Lagodon rhomboides, during an aggressive action in defense of territory. (Effective filter bandwidth 600 cycles). sounds consisted of one sharp click (Fig. 1), and in a 13-minute re- cording session 36 of these were clearly heard. The other two types. iSsM W Mr. 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 Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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