reaction of the fish to lighto A 3-|-foot fence^ with upright posts and 

 horizontals spaced plank barSj surrounded the tank on its upper edgeo 

 Towards the end of the summer „ the fence was lined with chicken wire 

 to keep the fish from jumping through, and the top was similarly covered 

 to keep visitors from throwing stones at the fisho Two 60-watt bulbs 

 were suspended above the tank and were lit from dusk to daybreaks 



Transfer of the fish from the Salpa's livewell to the tank 

 presented a problem as the only seaward approach was through a long, 

 narrow channel which could be navigated only with difficulty (fig<, 4)o 

 At firstj the ship hove to at the entrance to the channel, the fish 

 were placed in a square wire cage about 3x3x2 feet, and this was 

 towed down the channel with a skiff, the trip taking about 15 minutes. 

 On arrival at the shore,, the fish were carried by dipnet to the tank, 

 a distance of about 100 feeto Two dolphin were introduced in this 

 manner and were not damaged to any great extent during transfer. 

 However, of two frigate mackerel, one died while being towed and the 

 other as soon as it was placed in the tanko Both were damaged from 

 bumping and scraping against the sides of the cage„ Next, a circular 

 well of galvanized iron was built in a large skiffs The well was 

 aerated from a small oxygen bomb, the fish were placed in it, and the 

 skiff was moved down the narrow channel by means of an outboard motor. 

 Two tunny and one yellowfin were transferred in this mannero Although 

 they appeared to suffer but small damage during transfer, all three 

 fish died, one tunny and one yellowfin that same night, and the other 

 tunny during the second day. 



It was finally decided that the Salpa could be navigated 

 down the narrow channel during calm weathers it could be backed to the 

 sea wall within about 130 feet of the tank„ This procedure was 

 followed in all subsequent transfers. Thus, double handling of the 

 fish was avoided, although they had to be carried a greater distance 

 in the dip neto At this time improvements were made in the tanko It 

 was cleared of all rocks, clams, and fish such as jacks which might 

 harm the tunai the corner baffles and overhead lights were installedo 



Over the period June 20 to September 2, the following fish 

 were introduced to the tanks one skipjack (5 pounds), seven large 

 tunny (5 to 7 pounds), five small tunny (about 2 pounds), and eight 

 yellowfin (3 to 6 pounds). 



The skipjack, introduced on July 25, dashed rapidly about 

 the tank, ramming the sides „ It died within an hour. 



The seven large tunny, introduced at intervals between June 20 

 and September 2, swam more slowly than the skipjack and, for the most 

 part, avoided the walls of the tank. However they all died—three after 

 24 hours, one after 36 hours, two after 48 hours, and one after 60 hours. 

 For no apparent reason, and usually at night, a fish would suddenly 

 become frantic, and would dash wildly up and down the tank, ramming the 

 walls until finally it would dieo 



IS 



