. Commercial fisheries review. Fisheries; Fish trade. 50 COMMERCIAL FISHERIES REVIEW Vol. 17, No. fishing grounds are an important source of food for southern Japan, but have never fully recovered from the serious depletion caused by the intensive wartime fishing, states a May 12 U. S. Consular dispatch from Kobe. The concrete forms are being sunk in selected spots in and near the channel be- tween Awaji Island and the mainland and will serve to obstruct and hinder the cur- rents along the bottom and thus afford shel- ter for bottom fish and a breeding ground for plankton and other marine life
. Commercial fisheries review. Fisheries; Fish trade. 50 COMMERCIAL FISHERIES REVIEW Vol. 17, No. fishing grounds are an important source of food for southern Japan, but have never fully recovered from the serious depletion caused by the intensive wartime fishing, states a May 12 U. S. Consular dispatch from Kobe. The concrete forms are being sunk in selected spots in and near the channel be- tween Awaji Island and the mainland and will serve to obstruct and hinder the cur- rents along the bottom and thus afford shel- ter for bottom fish and a breeding ground for plankton and other marine life on which fish feed. The blocks, 4x4x5| feet, have window like openings on all sides and top, and are being sunk in 16 groups of 80 units each, making a total of 1,280 blocks. To- tal cost is estimated at approximately 9 million yen (US$27,000). Prefectural officials, basing their ex- pectations on experiments conducted in Osaka last year, estimate that the catch of bottom fish (bream, perch, bass, sand ell, and octopus) off Awaji will increase 20-30 percent in two years because of the Artist's conception of Japanese "Fish Shelters' EXPERIMENTS WITH FRESH-WATER PEARL OYSTERS: The fresh-water fishery association of Osaka has embarked on a series of experiments in raising pearl oysters in the small- and medium-sized fresh-water irrigation ponds that are so numerous in the Osaka City and Prefecture Area. These tests are designed to find a way to make full use of these ponds, and as a substitute for lost business due to a decline in carp and roach sales, states a June 6 U. S, Consular dispatch from Kobe. Pearl oysters have been successfully raised in limited numbers in the fresh waters of Lake Biwa near Otsu by the Shiga Prefectural Association in recent years, and it has been reported that the rate of pearl output there compares favorably with the salt-water pearl farms. Temperature and impurity balance are extremely im- portant in oyster culture and the Osaka ponds
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