of the Fishery Board for Scotland, 



205 



IV. REPORT ON THE OPERATIONS AT DUNBAR MARINE 

 HATCHERY DURING THE SPRING SEASON 1898. By 

 Harald C. Dannevig. Plate VIII. 



During the spring season of 1898 the hatching of plaice was carried 

 out on the same lines as in the previous years, and under much the same 

 conditions. The collection of the spawning fishes was begun on February 

 8th and continued till the middle of March, when 725 adult male and 

 female plaice had been received. Having been procured from steam 

 trawlers, the bulk of the fishes exhibited the same characteristic features as 

 have been described in previous reports, and they were not all equally 

 well suited for spawning purposes. While some succumbed to the 

 injuries received during their capture and transport, others that were in 

 a healthier condition soon began to produce eggs. 



The collection of impregnated eggs was carried out in the spawning 

 pond from the middle of February to May 7th, when altogether 

 21,510,000 had been collected and transferred to the hatching boxes. 

 Of this number 19,200,000 were successfully hatched, while the rest, or 

 10*7 per cent., died during the process. The daily progress of the 

 hatching work, and the records of the temperature of the air and of the 

 water in the pond and in the harbour, will be seen from Table I. 



Table I. — Showing the Daily Progress of the Hatching Work and 

 the Temperature of the Air and the Water in the 

 Harbour and in the Spawning Pond. 



Date. 



Number 

 of Eggs 

 collected 



Number 

 of Eggs 



dead in 

 boxes. 



Number 

 of Fry 

 put out. 



Number 

 of Eggs 

 and Fry in 

 the boxes. 



Tempera- 

 ture of the 

 Harbour at 

 Noon. 



Tempera- 

 ture of the 

 Pond at 

 Noon. 



Temperature 

 of the Air 

 at Noon. 















c. 



F. 



c. 



F. 



c. 



F. 



Feb. 



15th. 



50,000 







50,000 



6-7 



44 0 



6-6 



43 9 



12-7 



54-8 





16th. 







50,000 



5-9 



42-6 



6-3 



43-3 



5-4 



41-7 





17th. 



70^000 







120,000 



5 2 



41-4 



5 4 



41-7 



5 2 



41-4 





18th. 







120,000 



5 2 



41 -4 



5 2 



41-4 



31 



37-5 





19th. 



80^000 







200,000 



5-1 



41-2 



5 2 



41-4 



5-0 



41-0 





20th. 









200,000 



5-1 



41-2 



5-1 



41-2 



o-o 



32-0 



5> 



21st. 



80^000 







280,000 



5-0 



41-0 



51 



412 



2-4 



36 3 





22nd. 



i 



280,000 



5-1 



412 



5-0 



41-0 



4-5 



40-1 



} > 



23rd. 



50^000 







330,000 



4-8 



40-6 



4-9 



40-8 



2-7 



36-9 



)) 



24th. 



90,000 



20^000 





400,000 



5-0 



41-0 



4-8 



40-6 



3-6 



39-4 





25th. 



80,000 





480,000 



53 



41-5 



4-9 



40-8 



5-4 



41-7 





26th. 



110,000 







590,000 



51 



412 



51 



412 



4-1 



39-4 





27th. 



100,000 







690,000 



5-4 



41-7 



5 3 



41-5 



6 3 



43 3 



1 March 



1st. 



130,000 



40^000 





780,000 



51 



412 



5 2 



41-4 



6-8 



44-2 





2nd. 



140,000 





920,000 



4-9 



40-8 



4-8 



40-6 



3-0 



37 4 



5 5 



3rd. 



100,000 







1,020,000 



4-8 



40-6 



4-8 



40-6 



5-3 



41-5 





4th. 



160,000 







1,180,000 



4-5 



40-1 



4-6 



40-3 



4-7 



40-5 





5th. 



200,000 







1,380,000 



4-6 



40-3 



4-6 



40-3 



4 5 



40 1 





6th. 



150,000 



80^000 





1,450,000 



4'5 



40-1 



4-4 



39-9 



5 2 



414 





7th. 



180,000 





1,630,000 



4-8 



40-6 



4 5 



40-1 



4-7 



40-5 





8th. 



200,000 







1,830,000 



4-7 



40-5 



4-7 



40-5 



4-5 



40-1 





9th. 



140,000 







1,970,000 



4-8 



40-6 



4-7 



40-5 



3 3 



37-9 



i J 



10th. 



160,000 



70 j 000 





2,060,000 



5-0 



41-0 



4-8 



40'6 



7-7 



45-9 



5 > 



11th. 



210,000 





2,270,000 



5 0 



41-0 



5 2 



41-4 



8-9 



48-0 





12th. 



240,000 







2,510,000 



5-6 



42-0 



5-4 



41-7 



11-3 



52 3 





13th. 



220,000 



90^000 





2,640,000 



5-7 



42-0 



5-6 



42 0 



7-2 



45'0 



1 



14th. 



260,000 







2,900,000 



5-7 



42-0 



5-6 



42 0 



9-7 



49-5 



H 



15th. 



280,000 







3,180,000 



5 "3 



41-5 



5-4 



41-7 



5-3 



42 2 



5 5 



16th. 



270,000 



75^000 





3,375,000 



5-4 



41-7 



5-5 



41-9 



8-7 



47-7 



J> 



17th. 



290,000 







3,665,000 



5 6 



42-0 



5-6 



42-0 



100 



50-0 



