FOOD OF TELLOWFIN TUNA 



101 



Table 5. — Relation between size and volume of stomach contents of yellowfin tuna 



N = total number of sampled fish for each size group 



Empty = number of empty stomachs 



x = mean, or average food volume per stomach 



s = standard deviation, indicating variation in food volume for each size class 



C = the coefficient of variation, an index to variability 



NUMBER OF SPECIMENS 



12 



10 



5 43 135 239 132 93 



128 



75 



-1 r- 



102 



29 



■1 1 1 i r 



"To 20 30 40 50 60 70 80 90 100 MO 120 i30 WO ISO i60 170 180 190 200 



BODY WEIGHT IN POUNDS 



Figure 5. — Relation of stomach contents per unit body weight (cc./lb.) to body weight of 1,097 yellowfin tuna. 



