SEA-FISIIERIES LABORATORY, 



239 



From these daily averages a three-days' average has 

 now been made, with results as follows : — 







Daily 



3-daily 







Daily 



3-daily 



Nets 



Average 



Average 



Net 



s 



Average 



Average 



2. 



Mar. 26— 



110,000 



— 



12. 



Aug. 26— 



57 



205 



1. 



27— 



277,000 



162,777 



3. 



27— 



133 



176 



5. 



29— 



101,330 



165,610 



14. 



28— 



339 



428 



8. 



April 1— 



118,500 



156,610 



5. 



29— 



811 



467 



4. 



2— 



250,000 



234,500 



1. 



30— 



250 



426 



1. 



3— 



335,000 



738,583 



12. 



31— 



217 



181 



9. 



4— 



2,369,333 



2,079,378 



6. 



Sept, 2— 



76 



339 



5. 



5— 



3,533,800 



2,083,961 



11. 



3— 



724 



458 



2. 



6— 



348,750 



1,867,717 



19. 



4— 



575 



563 



10. 



8— 



1,720,600 



756,593 



27. 



6— 



390 



3,477 



14. 



9— 



200,429 



739,578 



3. 



9— 



9,467 



3,588 



17. 



lO- 



297,706 



326,345 



7. 



lO- 



906 



3,705 



8. 



ll— 



380,900 



294,491 



24. 



ll— 



743 



615,111 



15. 



13— 



204,867 



226,498 



19. 



12— 



1,843,684 



615,140 



11. 



15— 



93,727 



114,398 



3. 



13— 



993 



615,426 



15. 



16— 



44,600 



114,442 



1. 



14— 



1,600 



1,134 



1. 



17— 



215,000 



106,295 



7. 



16— 



808 



2,707 



14. 



18— 



59,286 



116,247 



14. 



17— 



5,714 



2,591 



11. 



19— 



74,455 



44,780 



15. 



18— 



1,252 



2,835 



11. 



22— 



600 



25,466 



8. 



19— 



1,539 



160,152 



12. 



23— 



1,342 



64,605 



32. 



20— 



477,664 



162,401 



15. 



24— 



191,873 



64,626 





21— 



8,000 



165,738 



15. 



25— 



663 



69,839 





23— 



11,550 



17,167 



12. 



26— 



16,982 



11,512 





24— 



31,950 



49,052 



22. 



27— 



16,890 



— 





26— 



103,655 



88,652 





Aug. 20— 



— 



2 





27— 



130,350 



120,785 



11. 



21— 



6 



2 





28— 



128,350 



279,317 





22— 



— 



5 





30— 



579,250 



266,217 



12. 



23— 



8 



144 





Oct. 1— 



91,050 



— 



19. 



24— 



425 



163 











On considering this list, the following points come 

 out: — The average number of Diatoms per catch often 

 varies considerably from day to day, as will be seen by a 

 glance at the table. Thus on April 5th the average 

 of all catches of that day was 3,533,800, while on April 

 6th it fell to 348,750 ; on April 24th it was 191,873, while 

 on April 25th it was only 663. Again, on September 

 10th and 11th it was 906 and 743 respectively, but rose to 

 1,843,684 on the following day ; on September 19th it 

 was 1,539, while on September 20th it was 477,664. 



Each of the above numbers, however, is the average 

 of several catches, that is of all the nettings taken during 



