The Body-temperatiire and the Bodily Features of "Katuo" and "Sanma" 



Synopsis / in English_y 



The Body-temperature of "Katuo"* 8, measured immediately after angled 

 up on board of fishing vessels shows a linear relation to the water 

 temperature ( ) at the fishing locality, as indicated in Figo 1,, and 

 is always 1°"3°C higher than Q , while the difference (® - 0) increases 

 with B (Fig. 2 - U) ' The elem.ents regarding to the features of fish-body 

 for "Katuo" and "Sanma",** such as the body-weight (W) , the total length 

 {L)j body-length ( / )^ height (X), circumference (-S"), thickness (c/), 

 and density {p) were measured and the factor /c'^l/X/Ovi , the . 

 ellipticity of the cross section (c), the ratios, d.~k/l^^-^/l > S'' > 

 s/A and the productSj d.^ ^ Ac/ > etCo were ccmputedo I'heu, the mutual 

 relations among the factors were discussed (Figo 5 - 11), with the empirical 

 equations^ which are almost represented in linear forms approximately. As 

 a result of it, the relation A'«»tf<^was established. Also we find that 

 the measurement of -S" is useful for the rapid inference of /C or cc^, 

 / end of English synopsis_/ 



Body temperature of skipjack . Skipjack which are hooked and hauled out of 

 the water die within a few minuteso Since it was desired to measure the 

 body temperature as near as possible to the time when the fish was swimming 

 alive in the water, fish were seized while they were still flopping about 

 alive on the deck and the body temperature was meas-ored by a rod-shaped 

 thermometer inserted well inside the body through the vent„ In some 

 cases the temperature was taken i'mmediately after the fish had died„ The 

 data obtained by the euthor in this way in May, 1936, aboard the fishing 

 boat Kaijin Maru of Shizuoka Prefecture on a cruise in the Ogasawara area, 

 and from troll-oaught skipjack in May, 194-0, aboard the Fisheries Experi- 

 ment Station rssearch vessel Soyo Maru while cruising in the Kinan and 

 Zunan areas are combined and shown in Figure 1, Figure 2, Figure 3, and 

 Figure •'•.o 



I B body tem.perature of the skipjack ( ® ) and the water temperature 

 of th!. environment at the time show an almost linear relationship, which 

 can -je represented approximately by the following empirical forraulao 



The difference between the body temperature and the water temperature can 

 be shown approximately by the empirical formulas (2) and (3).. 



9-e = " Ool5© -5(°C)...,. „._._...., o..(2) 



* katuo 5 skipjack, Katsuwonus pelamis 

 ** sanma s sauryj Gololabis saira 



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