342 EIGHTH PACIFIC SCIENCE CONGRESS 



most part fall readily into the named scheme of the Schilder's. He also 

 advanced opinions on the causes for the unequal distribution of the 

 North and South Pacific Holothurian fauna. The number of the dif- 

 ferent species of the various provinces were tabulated and presented in 

 graphs and charts. 



The session adjourned for lunch at about midday. 



When the afternoon session resumed at 2:00 P.M. Mr. Powell an- 

 nounced that there were six more papers to be presented. He said that 

 aside from the discussion after each paper, there would be a general 

 discussion after all the papers had been read. Comments and sugges- 

 tions would be entertained. Mr. Powell then called upon Dr. Har- 

 denberg to read his paper. 



Dr. Hardenberg's paper entitled "Distribution of Marine Fishes in 

 South East Asian Waters" presented the general range of distribution 

 of tropical marine fish fauna of South East Asian seas. The complex 

 pattern of the occurrence of fishes in different regions was discussed. 

 It mentioned the division of the seas into regions, and the factors im- 

 portant to the ecology of the marine fauna. Various species were cited 

 for particular fish fauna of several regions with common ecological 

 characteristics. 



The discussion was mostly concerned with the location of the eggs 

 and post-larval stages of parrot fishes. 



Dr. ScHULTz: I have been troubled for years about parrot fishes and 



how their eggs look like. Have you seen some eggs of these fishes? 



Dr. Hardenberg: No. I saw only ovaries with small eggs. I have seen 



a parrot fish in the open sea. 

 Dr. ScHULTz: We are troubled as to the identity of pelagic eggs at 

 Bikini Atoll. They looked like anchovies but these fish are not 

 found there. We even found certain fish eggs that looked like an- 

 chovy eggs. 

 Dr. Johnson: I found fish eggs 20 miles from the nearest land. 

 Dr. ScHULTz: What is the smallest parrot fish you have found? 

 Dr. Hardenberg: The smallest fish I have found is about 20 mm. 

 long. I observed the same condition in Caesio. The smallest I 

 have seen is about 5 to 6 cm. long. I have seen Caesio spawn at 

 the edge of coral reefs and the larvae get away after spawning. 



Dr. D. L. Serventy in 'An Analysis of the Pelagic Bird Faunas of the 

 Indo-Pacific Oceans", working on taxonomy in relation to distribution 

 patterns, considered that the whole of the Indian Ocean and the west- 

 ern and central part of the Pacific represented one homogeneous fauna 

 consisting of long-established descendants of the Tethyan fauna of the 



