Trout hatchery, California, 1939

18 photographs of a trout hatchery, showing the progression from eggs to full-grown trout, as well as the exterior of the hatchery and its pool, probably in California, 1939 June. Negatives with handwriting on them include: #17, "Eggs that should begin hatching at any time"; #18, "Trout eggs in hatching trays"; #16, "Trout not quite out of egg stage"; #14, "Trout almost ready for releasing"; #12-13, "Rainbow trout"; #15, "Hatchery"; #9, Trout pool and hatchery"; #8, "Outside fish trough"; #7, "Rainbow trout -- about 20 [inches] long"; #4, "Water enters trout pool"; #3, "Outside fish trough"; #2, Pool for large trout"; #6, "Golden trout -- about 16 [inches] long"; and #1, "Fish trough."

本数据集收录18张鳟鱼养殖场（trout hatchery）影像资料，完整记录了从鱼卵到成熟个体的鳟鱼生长全周期，同时涵盖养殖场外景与饲养池塘的画面，拍摄于1939年6月，拍摄地点大概率位于美国加利福尼亚州。底片带有手写标注详情如下：#17："即将随时开始孵化的鱼卵"；#18："孵化盘中的鳟鱼卵"；#16："尚未完全脱离卵期的鳟鱼"；#14："即将放流的鳟鱼"；#12-13："虹鳟（Rainbow trout）"；#15："养殖场"；#9："鳟鱼池塘与养殖场"；#8："室外养鱼槽"；#7："虹鳟——体长约20[英寸]"；#4："水源注入鳟鱼池塘"；#3："室外养鱼槽"；#2："大规格鳟鱼饲养池"；#6："金鳟（Golden trout）——体长约16[英寸]"；#1："养鱼槽"。