42 
BULLETIN OF THE BUREAU OF FISHERIES. 
these assumptions are improbable, entailing the corresponding certainty that the 
rate of travel was frequently more than 33 miles per day and may even have doubled 
or trebled that speed. That the rate was not notably exceptional in this individual 
is shown in Tables 9 and 10 by records of other recaptures in the Bristol Bay dis- 
trict. Six individuals of the June 30 marking averaged 20 days in passing from 
Unga Island to the point of capture in Bristol Bay. Among our unverified assump- 
tions is that predicating False Pass rather than Unimak Pass for entrance into 
Bering Sea. This assumption is a probable one in view of the number of captures 
in Morzhovoi and Ikatan Bays, near the entrance to False Pass. If Unimak Pass 
had been traversed, the distance would have been approximately 125 miles farther 
and the minimum rate increased to 40 miles per day. 
A second marking experiment was conducted on Unga Island on July 1, when 
260 fish were tagged and released from the Pacific American Fisheries trap No. 3 
(the Old Kelly Rock trap). As shown in Table 10, the majority of the recaptures 
were made in Morzhovoi and Ikatan Bays, the remainder being reported from 
Ugashik, Egegik, Naknek, Kvichak, and Nushagak fishing grounds in Bristol Bay. 
The percentages of recapture from the two Unga experiments were almost identical — 
9 per cent in the first and 8 per cent in the second. In the first experiment 72 per 
cent of the total recaptures were made in Morzhovoi and Ikatan Bays, in the second 
experiment 65 per cent. 
The rate of travel from the Old Kelly Rock trap of the salmon marked July 1 
was consistently higher than in those tagged the previous day from the New Kelly 
Rock trap. In the second experiment the average time spent in reaching Morzhovoi 
and Ikatan Bays was 8 or 9 days and in reaching various points in Bristol Bay 15 
days 
2. Morzhovoi Bay . — Two hundred red salmon were tagged and released in 
Morzhovoi Bay on June 20 from Pacific American Fisheries trap No. 2, located near 
the middle of the southwest shore. 
Heavy recaptures were at once effected in Morzhovoi Bay, beginning with June 
22 and continuing until June 30, during which period 59 salmon, or 30 per cent of 
the tagged fish, were recaptured in the same bay in which they were liberated. 
During this same period scattering captures were made in the adjacent Ikatan Bay, 
the total equaling 14 salmon, or 7 per cent. Three individuals were captured on 
the Port Moller fishing grounds between June 27 and July 7. Thirty-nine per cent 
of the salmon tagged in Morzhovoi Bay were recaptured in these three localities. 
None was reported from Bristol Bay or from any district other than those mentioned. 
It is worthy of note that of the salmon recaptured from this experiment more 
than four times as many (59 as against 14) were taken in Morzhovoi Bay as in 
Ikatan Bay, yet they would have to pass through Ikatan Bay on their way to 
Isanotski Strait if bound for Bering Sea and Bristol Bay. 
This becomes all the more noteworthy when considered in connection with 
proportionate recaptures of salmon tagged and released in Ikatan Bay. As an 
extensive migration is known to exist into Bering Sea and as the fish are free to 
traverse Isanotski Strait directly from Ikatan Bay, it would seem highly probable 
that a much larger proportion of Ikatan fish would be recaptured in Ikatan Bay 
