. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 4.^ CALlKdK'NlA FlSIl AXI) <;AME elapse between spawninrr and the emergence of the young fisli from tlie gravel of the stream beds. Most of the young salmon and many of the young stoelhead start downstroam soon after they come up from the gravel. Part of these early migrants drift do\\n the tributaiy streams and out into the main river before the irrigation season starts, but even larger numbers are still in the tributary streams w
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 4.^ CALlKdK'NlA FlSIl AXI) <;AME elapse between spawninrr and the emergence of the young fisli from tlie gravel of the stream beds. Most of the young salmon and many of the young stoelhead start downstroam soon after they come up from the gravel. Part of these early migrants drift do\\n the tributaiy streams and out into the main river before the irrigation season starts, but even larger numbers are still in the tributary streams when the ranchers start to irrigate in April or May. These young fish are the ones that are so very apt to swim down an irrigation ditch and into a ranch fiohl in^^tearl of going down the main stream to the river. There are very few irrigation ditches which take water out of the Klamath and Trinity rivers themseh'es; very largely, they divert out of the tributaries to these rivers so that once a fingerling or yearling fish has reached the main river it is comparativelv safe from the farmers' fields. Far more fish are lost down the irrigation ditches during the period March to July than during the remainder of the year. It is necessary that the screens be operating as soon as water is turned into the ditches in the spring for that is the time of the heaviest downstream migration of young fish. Although the peak of the migration is over by July there are many fish which continue to come down during the remainder of the year. For some unknown reason the spawning in certain tributaries is later than in the majority. For example the very young steelhead are drifting downstream in Beaver Creek, a tributary to the Klamath River, in large numbers in September Avhen the migration in most other streams is long past. Early in the article it was pointed out that fish screens have been slowly improving from year to year. Many screens now operating in California are of outmoded design. They
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