Mysis diluviana is one of the most abundant zooplankton by biomass in the Laurentian Great Lakes of North America, a predator of other zooplankton and an important prey for fishes. Studies of long-term trends in Lake Michigan have shown 2005–2016 densities to be 50–80% lower than 1990s densities, but these observations have been based on annual monitoring that is either spatially or seasonally limited. We combined Lake Michigan Mysis data from three annual programs and the 2015 Cooperative Science and Monitoring Initiative to achieve broad spatial coverage during spring, summer, and fall of 2015 and broad depth coverage during spring 2016. Lake-wide, annual density and biomass were 82 (SE: 10) Mysis/m² and 200 (SE: 36) mg dry mass/m². Density and biomass estimates were highest offshore, generally higher in the north basin, and seasonally highest in summer. Annual lake-wide averages for depths >30 m were better captured by seasonally-extensive annual programs than spatially-extensive annual programs, although spring sampling may bias annual values low. Mysis cohorts grew 0.026 mm/d (age-0) and 0.007 to 0.027 mm/d (age-1). Annual mortality was 81–98%. Reproduction was fall-spring and seasonal lake-wide estimates ranged from 0.6 to 19.1% females brooding, 13–20 embryos/brood, and 3–46 embryos/m². Annual production (423 mg dry mass/m²/yr, SE: 31) was lower than all but one previous estimate from lakes Michigan, Huron, and Ontario. While Mysis tend to persist, low Mysis production may be a concern for prey fishes that feed on Mysis.

在北美劳伦斯大湖中，Mysis diluviana是生物量最丰富的浮游动物之一，是其他浮游动物的捕食者，也是鱼类的重要猎物。对密歇根湖长期趋势的研究表明，2005-2016年的密度比1990年代的密度低50-80％，但是这些观察结果是基于空间或季节受限的年度监测得出的。我们结合了三个年度计划和2015年合作科学与监测计划的密歇根湖Mysis数据，以在2015年春季，夏季和秋季实现广泛的空间覆盖，并在2016年春季实现广泛的深度覆盖。全湖，年密度和生物量为82 （SE：10）Mysis / m ²和200（SE：36）mg干质量/ m ²。海上的密度和生物量估计最高，北部盆地通常更高，夏季则季节性最高。尽管春季抽样可能使年度数值偏低，但季节扩展型年度计划比空间扩展型年度计划更好地记录了全湖年度平均深度> 30 m。Mysis群组增长0.026 mm / d（年龄0）和0.007至0.027 mm / d（年龄1）。年死亡率为81–98％。繁殖是秋天的春天，整个湖面季节的繁殖率范围为：雌性育雏为0.6％至19.1％，每个育种13–20个胚和每m ² 3-46个胚。年产量（423 mg干质量/ m ² /年，SE：31）低于密歇根湖，休伦湖和安大略湖，但仅此一项而已。虽然Mysis倾向于持续存在，但低对于以Mysis为食的pre鱼，Mysis的生产可能是一个问题。