6 
782 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [30] 
artificial planting ground for all time, except, as is weil understood, in 
the case of accidental mortality, such as has been occasioned by volcanic 
eruptions, which have sometimes necessitated their renewal. Each 
rockery (Fig. 5) is SesO Tel by a ‘circle of stakes, which are fastened 
Fria. 5.—Artificial oyster rockery of Lake Fusaro. 
in the bottom of the lake by one end, while the other extends up out of 
the water so that they can be seen and removed when necessary. Often 
these stakes are united by a cord passing from one to another (Fig. 6), 
and to which is suspended, between each two stakes, a small bundle of 
——— — ae twigs, floating in the 
water ashort distance 
from the bottom. 
These, together with 
boats, tools, and a 
= storehouse, consti- 
—— tute the entire appa- 
22 _= ratus used for oyster 
== = cultureat Fusaro,and 
===— such is the appara- 
= tus whichcommonex- 
perience has found to 
be invariably effica- 
Fic. 6.—Bundles of twigs panera tere ene nace of oyster cious. At the Spawil: 
Tockeny: ing season the oysters 
deposited upon the artificially formed rockeries, and living there as if 
in the open sea, allow the myriads of germs to which each gives birth 
to escape, aS an animated cloud of dust-like particles, which, finding 
close at hand suitable materials for their attachment, become located 
there almost as a mass, beside the mother oysters. An insignificant 
portion only of these young oysters are lost, either by being carried 
away by the current of the water, or by being buried in the mud of 
the bottom. The colony is thus continually increasing in size by the 
