Table 1. — Prediction equations emd component factors relating headless to 

 whole (y on X) and whole to headless (X on Y) weights in five common 

 penaeid shrimps. 



I = predicted weight of headless shrimp; X = predicted weight of corresponding whole shrimp 



vice versa, and (3) conversion on a number- 

 per-pound basis alone. 



To use figures 1-3 for purposes of rough 

 conversion, proceed as follows for each of 

 the indicated cases; 



1. Determine the predicted weight of a 

 headless shrimp by simply reading upward 

 from the whole weight on the lower scale to 

 the diagonal line, and then across to the 

 corresponding headless weight on the left- 

 hand scale. Determine the predicted weight of 

 a whole shrimp from its corresponding head- 

 less weight by reversing the process. Mathe- 

 matically, the conversion proceeds as follows: 

 For example, assume a headless brown shrimp 

 weighs 27.42 grams and we wish to determine 

 what its whole weight was. Using the second 

 equation given in the lower righthand corner 

 of figure 1 (also in column 2 of table 1), 



Predicted whole weight (X) = 1.617(27.42) -0,153=44.18 

 grams. 



2. Determine the approximate number com- 

 prising 1 pound of headless or whole shrimp, 

 in which every individual has the same specified 

 weight, by reading directly from either the 

 left- to right-hand scale, or from the lower 



to upper scale (figs. 1-3). Hence 1 pound of 

 shrimp (any species) wherein each individual 

 (headless or whole) weighs 50 grams would 

 contain roughly 9 specimens; 1 pound of shrimp 

 in which every one weighs 30 grams would 

 contain about 15 specimens. The reverse 

 procedure enables conversion from number- 

 per-pound to individual weight units. In addi- 

 tion, the numbers per pound of headless 

 shrimp yielded by uniformly sized whole 

 shrimp of a specified weight are obtained 

 by reading from the lower scale to the diagonal 

 and thence to the right-hand scale. Thus 

 whole white shrimp (fig. 3) weighing 80 grams 

 (3 oz.) yield headless shrimp of a size such 

 that nine will weigh 1 pound. In the same 

 manner, conversion from uniform headless 

 weight to corresponding whole-shrimp-per- 

 pound units is made by proceeding from the 

 left-hand scale to the diagonal, and then to the 

 upper scale. 



3. Determine in terms of number-per- 

 pound units the yield of headless shrimp 

 from the corresponding whole shrimp by 

 simply reading down from the upper scale 

 to the diagonal, and then across to the left- 

 hand scale. For instance, pink shrimp 



