302 TREUBIA VOR I, 2-4, 
“ively on their backs at the surface”. I think I have a clear recollection 
of seeing my larvae of the island Amsterdam quite capable of swimming 
downwards even in the salt, i.e. heavy water, and of their not drifting 
about at the water-surface when they no longer had anything under water 
to hold on to. 
APPENDIX TO CHAPTER V. 
After Chapter V had been printed I found that I had forgotten to 
allude in it to some publications containing data concerning Chanos chanos 
(FORSK.) reared in ponds. 
Thus JORDAN and EVERMANN (542) mention a singular-looking spe- 
cimen of Chanos chanos (FORSK.), extraordinarily short and deep. Their 
description shows that they are alluding to the same kind of deviation 
as described by me in Chapter V (pg. 199 and 200) which is said to 
occur also in Australian specimens of Chanos chanos (FORSK.) (cf. note 
page 200). Further JORDAN and EVERMANN (1544) write: “The awa” (or 
milkfish = Chanos chanos (FORSK.)) “is one of the most important food 
“fishes of the Hawaiian Islands. It occurs about the various islands, 
“but is most abundant about Honolulu. It is, next to the mullet (Ama- 
“ama)'), the most common species frequenting the artificial ponds into 
“which it runs with the mullet and with the tide and is restrained in 
“the same way”. COBB (!®Ab) also states that the fish enter the Hawaiian 
sea-ponds with the current. In discussing these ponds he says: “When 
“the tide is coming in both doors are opened and the fish are allowed to 
“go in freely”. In Chapters V and VIII on the other hand, I stated re- 
peatedly that both the bandeng in the Batavia empangs, and the fry of 
other fish entering these ponds from the sea, swim against the current. 
As, however, I am ignorant of the local conditions prevailing in the 
Hawaiian sea-fishponds, I cannot attempt to discuss this seeming con- 
tradiction. 
Concerning the Hawaiian marine fishponds in which Ch. chanos 
OSS are reared, COBB (!?Ab) adds: “The sea-ponds usually contain 
“only the ama-ama, or mullet, and the awa. 
“Practically no attempt at fish-culture is made HE hese omde. 
“Besides the fish which come in through the open gates at certain seasons 
“of the year, the owner usually has men engaged in catching young ama- 
“ama and awa in the open sea and bays, and transporting them alive to 
“these enclosures, where they are kept until they attain a marketable 
“size, and longer, frequently, if the prices quoted in the market are 
“not satisfactory. It costs almost nothing to keep them, as they find 
1) Mugil cephalus L.. 
