Patent GB-341576-A (GB)
Title: Process and apparatus for obtaining the formation of an iodised marine developing medium for the production of oysters or other edible marine shellfish rich in iodine
IPC: A01K61/54
Filed: 1929-10-28
Abstract: A developing medium for oysters or other edible marine shellfish is obtained by introducing into a tank sea-water flora and vegetable and animal micro-organisms and subsequently passing through the tank sea-water constantly charged with iodine in solution.  In the method described, a cement tank is used, the bottom being covered with a thick bed of sand and the upper portion having racks with perforated bottoms.  A circulation of water is provided from top to bottom, the water being removed and aerated.  A part of the water is drawn from the circulation conduit through a regulating cock and is passed into a receiver containing iodine or an iodine compound which gradually dissolves and the iodized water is returned to the main body of water. Before starting the circulation of water, a quantity of shellfish, e.g. mussels, is introduced into the racks to the extent of about 2 per cent of the water content of the tank and these are allowed to die and decompose which takes about 5 or 6 days.  The racks are then withdrawn and carefully cleaned.  The tank is allowed to stand for 2-3 days and becomes muddy and small alg  develope. The water circulation is then begun and at the end of several days the liquid has again become limpid and odourless.  The racks are then filled with marine shellfish, e.g. oysters, and some marine plants, laminaria or fucus, are placed on the sand at the bottom. These plants import the elements of living nourishment for the shellfish. These elements reproduce and multiply particularly at the expense of the vegetation and become iodized and form the plankton on which the oysters feed.  In this way the oysters develop fat and vigorous and fix and hold large quantities of iodine, e.g. several hundred times that normally present therein, without their taste becoming affected.ALSO:A developing medium for oysters or other edible marine shellfish is obtained by introducing into a tank sea-water flora and vegetable and animal micro-organisms and subsequently passing through the tank sea-water constantly charged with iodine in solution.  In the method described, a cement tank is used, the bottom being covered with a thick bed of sand and the upper portion having racks with perforated bottoms.  A circulation of water is provided from top to bottom, the water being removed and aerated.  A part of the water is drawn from the circulation conduit through a regulating cock and is passed into a receiver containing iodine or an iodine compound which gradually dissolves and the iodized water is returned to the main body of water. Before starting the circulation of water, a quantity of shellfish, e.g. mussels, is introduced into the racks to the extent of about 2 per cent of the water content of the tank and these are allowed to die and decompose which takes about 5 or 6 days.  The racks are then withdrawn and carefully cleaned.  The tank is allowed to stand for 2 or 3 days and becomes muddy and small alg  develope. The water circulation is then begun and at the end of several days the liquid has again become limpid and odourless.  The racks are p then filled with marine shellfish, e.g. oysters, and some marine plants, laminaria or fucus, are placed on the sand at the bottom. These plants import the elements of living nourishment for the shell-fish.  These elements reproduce and multiply particularly at the expense of the vegetation and become iodized and form the plankton on which the oysters feed.  In this way the oysters develope fat and vigorous and fix and hold large quantities of iodine, e.g. several hundred times that normally present therein, without their taste becoming affected.