Abstract
The time length of extending and retrieving work of 10 strings of tuna longline settled June, 1997 in the
eastem part of the Indian Ocean by a stem ramp trawler type l,000 G.T. fishery training vessel and the walking
pace of crew members during these works were recorded. Their relation to the gear construction and the surface
conditions was examined, and the following results were obtained : 1) The length of working time depended on
the gear construction. 2) It took a longer time to retrieve a deep-lying string, While it required a shorter time
when the string was retrieved by the vessel facing a wind from starboard. 3) Equations, which could be regarded
to be significant at 0.05 level or yielding the multiple correlation coefficient higher than 0.5 using 1 or 2 explanation
variables, could be obtained for the walking pace of more than a half of the members concemed. 4) The
significant equations for walking pace during retrieving work adopted the variables of surface conditions as the
explanation ones. 5) Suggested influence of the surface conditions from the present results coincided with our
experience on board. 6) To reach a clear conclusion, further studies were found to be needed, using the records
for more strings, in which the probable explanation variables less frequently showed correlation to one another.
