6 SOME XOTES OX ADULT CHANOS by R. Mardj oko Tjiptoaminoto* No one has ever sew the adspawning of (d) East Java Chmar, so for the rime being it is not possible to in Madura Strait in the vicinity of Djqkar state the exact spawn@ grounds. Several factors, Reef, between Madura island and the coast of e.g. site and time of .capture of mature ~peCben~, Besuki place and time of occurrence of fry, location af schools of adult. CRms observed etc. lead to the (el hm Sunda Islands pre1;minarv concImion or assumption that Cbs spawn in the following localities. I. in the Mores Sea, been Bali and South Celebes. (a) North Sumnim 2. India4 Ocean, South of the island Bali and I. close to the shores of Acheh at places at a Lombok. depth of about 50-70 m.,with mdybottom 3. probably ahclose to the coast of Northern or presence of reefs. -4ushlia. 2. in tbe Malawi strait between North Sumava and the Malay peninsula, nearer to the Iatter. (0 cddm I. Around the Spermonde Archipelago. ('1 wet Jm 2. Gulf of Bone, henSiwa and Kolaka. in the Java sea, about 12 miles from the coast, except in the Krawang area about 3 to 5 miles ;. Gulf of Poso. from the cogst. (c) Central Jmu in the Java wa, 6-12 miles from the shore. - -. -- * lnlsnd Fisheries Senice, Surabnya/Mndura Region, Surahya, Ladoacsia. In recent times schools of adult Chos have been observed at the following IocaIities. (a) Java sea Schools of Cbsobserved could be recognkd I. North of Tuban (East Java). by the repeat&dy frequent leaps of the *hes. 2. North of Sidaju (kt Java), in the months Beside schools of 10 to 15 specimens, also schools of October md November. several hundreds (roo-700) were noticed. Some reports mentioned schools of x5a Iong and gm. (b) Madura Strait wide. I. North of Pasuruan, July 1954, February Nodly the schools swim at the sutface, so the 1955,at 17 hours, high tide. top of the. caudal fin is visible. At intervals hey 2. Same locality, month of observation not disappear heaththe surface for a couple of minutes. mentioned, he10-12 hours. This occurs however only in places where the water 3. Nanh West of Panarukan, date unknown, is clear, time 10-12 hours. In the Gulf of Bone the aduIt fishes prefer foamy + Korth Fhst of Panarukan, October 1946, waters ; so they may approach the shore and Aome- time not mentioned. times enter river-mouths. Most interesting is the phenomenon that schools (c) Bdi Strait &tween Java and Bali), August of Chnos are repeatedly observed in the mouth of the =954- rivers Poso, Bega and Tongko, which flow into the (d) Mas Strait (between the islands of Lombok Gulf of Poso. 'At noon the schools swim up the and Sumbawa), mostly in September 1954 rivers and go back to the rocky parts of the sea in the from 6 to 10 o'clock in the morning and in afternoon. October r 954 from I 6 to 18 hours. In the Gulf of Born (Celebes) adult fishes follow (e) Gulf of Pm, date not specified, time from 6 the coast Sic during high tide and enter the rivers. to 18 hours. The people are aware of this habit and take the opportunity of catching them by means of several (I, Gulf of Bone, normally in October at about types of gear. IO in o'clock the morning. It is also noticed that East of Lornbok, Chastos (g) Banda-sea, near Kei ishds, March 1955. schd swhn against the sea current, .