IØ my »First Report on the oysters and oyster fisheries in the Lim 
Fjord«, Report XV for the year 1907, it was explained that many oysters in the 
Lim Fjord could not reach the standard size 8 X 3 cm. fixed by the Government ; 
that this should therefore be reduced and that the fishery should be carried on 
more energetically on the whole than was at present the case, as far too many 
oysters died of old age without being of use to anybody. To be able to give 
definite figures for the further elucidation of these questions, I undertook a series 
of investigations in 1907 on the stock of oysters in the Lim Fjord at a number 
of different places. These investigations might easily have been carried out on a 
larger scale and with larger quantities of oysters, but I believe that what has been 
done is sufficient, on the one hand to throw light on many points where such was 
very necessary and on the other to provide a comprehensive view over many 
points where such was advisable. 
The investigations have been specially directed to determine, how large 
the oysters were which were taken by means of the pole-dredge, the dredge and 
diving respectively on the different hbanks, thus in other words, how large the 
oysters were which were growing at the different places; secondly, how the present 
standard 8 X 3 cm. and the standard proposed by myself, which is 1 cm. smaller 
(7 X 3 cm.), suited these oysters. Further, it appeared during these investigations 
that diving enabled a good estimate to be made as to how many millions of 
oysters were living in the fjord at the moment. Such diving investigations were 
therefore carried out. Lastly, various other investigations of biological interest 
were undertaken, amongst these marking of oysters. 
Table I shows the length of oysters obtained by the pole-dredge 
at various places in the Lim Fjord. The oysters were measured lengthways, that 
is, from the point of the shell at the hinge to the opposite edge. When the oysters 
are measured by the inspectors with the 8 x 3 cm. iron standard, they pass through 
this sometimes lengthways, sometimes broadways. Such a method of measuring 
could not be used for these investigations, as according to it an oyster 8 cm. in 
length would sometimes he a standard oyster if it were thick and broad, whilst on 
the other hand an oyster of 10 cm. might be undersized if it were thin and 
narrow. We shall see later regarding the relation of this standard. to the length 
of oysters. 
The Table shows in the last column, which gives the number of all the 
oysters of the same length from 1—12 cm. taken in the pole-dredge, that 8 cm. 
