Contents. 
Page 
A. Historical summary: Danish investigations on the oyster fisheries and biology of 
the oyster. The various contracts, their terms, results, etc. Undertakings with a 
view to preserving and -increas ing the stock of oysters..........s000reueneene 3—19 
AD DEN TIE e SEE VU SIRENE RE En EST RÅDNE SEES al ry FORE ENE ars 20 
B. Investigations of the author in 1895, 1896, 1905 and 1906 etc. 
Situation of the oyster banks in the Lim Fjord and the salinity. Duration of the 
Spam esperodeENUum ber OS Paw Dine Sys ES Eee 21—22 
The spat in relation to the temperature and salinity in aquaria. Duration of the 
spat stage and occurrence in nature. The occurrence of the fixed spat on 
colleetorskan denn diget SE ES Se ere ye RE ENE Te tee e re Fare ENE ERE 22—27 
Harmful infduences and enemies both for the spat and adult oysters ............... 27—30 
koodsolsthetorstert enlkaonketes rets tere SIRENE en sg Ra NRGeREl EEN SD NED 30—31 
Estimate of the age of oysters. Measurements of the oysters on the banks. Tables 
I—II. Growth of the spat; their occurrence in shallow and deep water. 
Growth-stages. Oysters of ca. 3 inches usually 3—4 years old. Growth 
varies under different conditions. The present standard for oysters is rec- 
tangular. Many oysters do not reach the standard yet die of old age. How 
large do the oysters become in the Lim Fjord? Smaller oysters should 
also be fished. The present principle is wrong. The 4 years rest of doubtful 
value. Biological knowledge has advanced since then. Å more intensive 
J fishery might be carried on along with new experiments in antificial me- 
thods of increasing the stock; the older experiments failed in principle ..... ” 31—39 
ne ar SE EN ER NS en blee sd ere SEE DEERE ENS 39—41 
A. Historical Summary. 
Of the Danish publications on the oyster and the biology of the oyster 
may be mentioned the following: 
H. Krøyer: De danske Østersbanker 1837. 
D. F. Eschricht: Om den kunstige Østersavl i Frankrig og om Anlæg af 
kunstige Østersbanker i Limfjorden. Two reports to the Minister of Finance. Printed 
by order of the Minister of Finance 1860. 
Eschricht reports here on the endeavour of Professor Coste to form new 
oyster banks on the open coasts of France at places where these had not been 
present earlier. Coste's experiments had just begun at that time and seemed to 
7) Appendices II—VII are omitted in the English translation, as they are of interest to 
restricted Danish circles only; they contain partly the terms of contract hetween the Government 
and the contracting Oyster Companies, partly also the conditions of sale. 
