Pacific herring (Clupea pallasii) typically spawn in Sitka Sound from mid/late March to early April. For a few days, an intensive sac roe fishery is opened. Throughout the event, abundance and spawning conditions of the fish are closely monitored by test fisheries coordinated by the Alaska Department of Fish and Game.
The concentration of herring in the bay is quite phenomenal. Large areas of spawning activities produce milt that transformed the surrounding water to an emerald green.
Fishing is performed by purse seiners. A large net (seine) is deployed in front of a fish school by the fishing vessel. With the assistance of a small skiff, the seine is rapidly pulled around the targeted school. Once the two ends are joined, the net is closed and brought up.
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From Sitka Alaska