298 



DISCOVERY REPORTS 



II B. The 'theoretical' weights are derived direct from the formula as explained above, K values 

 being used from Tables 16 and 17; the 'probable minimum' weights are 18% less than these, i.e. 

 I have assumed a probable maximum error of — 18 % . 



An individual example of the potential value of K may be given from our richest haul of M. hubbsi. 

 Here, at St. WS853, 1154 fish were captured in an hour. Of these, 943 were males and 21 1 females; 

 all the females and 414 of the males were measured, and also weighed in 10 cm. length groups. The 

 remaining males, 529 in number, were not measured, but were weighed in bulk. First let us see how 

 far out our estimates of weight for this catch would have been, using the appropriate values for K 



Table 16. Table of K for male Merluccius hubbsi througliotit the year, computed as described 



in the text. Interpolated values in italics 



Length 

 in cm. 



25- 1-26-0 

 26- 1-27-0 

 27-1-28-0 

 28-1-29-0 

 29-1-30-0 

 30-1-31-0 

 31-1-32-0 

 32-1-33-0 

 33-I-34-0 

 34-I-35-0 

 35-I-36-0 

 36-1-37-0 

 37-1-38-0 

 38-1-39-0 

 39-1-40-0 

 40-1-41-0 

 41-1-42-0 

 42-1-43-0 

 43-1-44-0 

 44-1-45-0 

 45-1-46-0 

 46-1-47-0 

 47-1-48-0 

 48-1-49-0 

 49-1-50-0 

 50-1-51-0 

 51-1-52-0 



52-I-S3-0 

 53- 1-54-0 

 54-I-55-0 

 5S-I-56-0 

 56-1-57-0 

 57-1-58-0 



July 



Aug. 



0-744 

 0-742 

 0-742 

 0-742 

 0-740 

 0-739 

 0-735 

 0-733 

 0-72J 

 0-722 

 o-yi6 

 0-709 

 0-701 

 o-6g2 

 0-683 

 0-671 

 o-66o 

 o-64g 

 0-640 

 0-634 

 o-62g 

 0-624 

 0-623 

 0-621 

 0-618 

 0-617 

 0-615 

 0-614 

 0-614 

 0-614 

 0-613 

 0-613 

 0-612 



o-jyi 



O-JJO 



o-76g 

 o-76g 

 0-768 

 0-766 

 0-762 

 0-760 

 0-754 

 0-749 

 0-743 

 0-735 

 0-727 

 0-718 

 0-708 

 o-6g6 

 0-684 

 0-673 

 0-664 

 0-658 

 0-653 

 0-647 

 0-646 

 0-643 

 0-641 

 0-640 

 0-638 

 0-637 

 0-637 

 0-637 

 0-636 

 0-636 

 0-635 



Sept. 



0799 

 0797 

 0797 

 0797 

 0-795 

 0-793 

 o-78g 

 0-787 

 0-781 



0-775 

 o-76g 

 0-761 

 0-752 

 0-743 

 0-733 

 0-720 

 o-7og 

 o-6g7 

 0-688 

 0-681 

 0-676 

 0-670 

 o-66g 

 0-666 

 0-664 

 0-662 

 0-661 

 0-660 

 o-65g 

 o-65g 

 o-65g 

 o-65g 

 0-658 



Oct. 



0-819 

 0-818 

 0-817 

 0-817 

 0-815 

 0-814 

 o-8io 

 0-807 

 o-8oi 



0795 

 0-789 

 0-781 

 0-772 

 0-762 

 0-752 



0739 

 0-727 

 0-715 

 0-705 

 0-697 

 0-693 

 0-687 

 0-686 

 0-683 

 0-681 

 0-679 

 0-678 

 0-677 

 0-676 

 0-676 

 0-675 

 0-675 

 0-675 



Nov. 



0-786 

 0-784 

 0-783 

 0-783 

 0-782 

 0-780 

 0-776 

 0-774 

 0-768 

 0-763 

 0-756 

 0-749 

 0-740 

 0-731 

 0-721 

 0-709 

 0-697 

 0-685 

 0-676 

 0-670 

 0-665 

 0-659 

 0-658 



0-655 

 0-653 

 0-651 

 0-650 

 0-649 

 0-648 

 0-648 

 0-648 

 0-648 

 0-647 



Dec. 



0-705 

 0-704 

 0-703 

 0-703 

 0-702 

 0-700 

 0-697 

 0-695 

 0-689 

 0-684 

 0-679 

 0-672 

 0-664 

 0-656 

 0-647 

 0-636 

 0-626 

 0-615 

 0-607 

 0-601 



0-597 

 0-592 

 0-590 

 0-588 

 0-586 



0-585 

 0-583 

 0-583 

 0-582 

 0-582 

 0-581 

 0-581 

 0-581 



Jan. 



0-678 

 0-676 

 0-676 

 0-676 

 0-674 

 0-673 

 0-670 

 0-668 

 0-662 

 0-658 

 0-652 

 0-646 

 0-638 

 0-630 

 0-622 

 0-61 1 

 o-6oi 

 0-591 



0-583 

 0-578 



0-573 

 0-569 

 0-567 



0-565 

 0-563 

 0-562 

 0-561 

 0-560 

 0-559 

 0-559 

 0-559 

 0-559 

 0-558 



Feb. 



0-662 

 o-66i 

 0-660 

 0-660 

 0-659 

 0-658 



0-655 

 0-653 

 0-647 

 0-643 

 0-638 

 0-631 

 0-624 

 0-616 

 0-608 



0-597 

 0-588 



0-578 

 0-570 



0-565 

 0-560 



0-556 



0-554 



0-553 



0-551 



0-549 



0-548 



0-547 



0-547 

 0-547 



0-546 



0-546 



0-545 



Mar. 



0-658 

 0-657 

 0-656 

 0-656 

 0-655 

 0-654 

 0-651 

 0-649 

 0-643 

 0-639 

 0-634 

 0-627 

 0-620 

 0-612 

 0-604 



0-594 

 0-584 



0-574 

 0-567 



0-561 



0-557 

 0-552 



0-551 

 0-549 

 0-547 

 0-546 



0-545 

 0-544 

 0-543 

 0-543 

 0-543 

 0-543 

 0-542 



Apr. 



o-66g 

 0-668 

 0-668 

 0-668 

 0-666 

 0-665 

 0-662 

 o-66o 

 0-654 

 0-650 



0-645 

 0-638 

 0-631 

 0-622 

 0614 

 0-604 



0-594 

 0-584 

 0-576 

 0-571 

 0-566 

 0-562 

 0-560 

 0-558 

 0-556 

 0-555 

 0-554 

 0-553 

 0-553 

 0-553 

 0-552 

 0-552 

 0-551 



May 



June 



given in Tables 16 and 17. 414 males had a mean length of 36-5 cm., and 529 males unmeasured, 

 assummg the same mean length, give us a total of 943 males, i^for March males of 36-37 cm. (Table 16) 

 is 0-627. Hence the theoretical weight of the males is given by 



W'~ 



100 



X 0-627 X 943 g. 



= 486-27 X 0-627 >^ 943 g- 



= 304-89129 X 943 g. 



= 287,512-48647 g., say 287-5 kg. 



