Walleye Stizostedion vitreum support recreational fisheries throughout their range but increasingly require annual stockings to maintain populations. In many areas of their distribution, Walleye broodfish are collected annually and manually spawned onsite before fertilized eggs are transported to fish culture facilities for rearing. As such, efficiency of these programs is reliant on effective capture of broodfish. Generalized additive models were used to explain the influence of eight environmental factors on catch per effort (CPE) of ripe female Walleye and male Walleye during brood collection events from Hillsdale Reservoir, Kansas, using data from 2009 to 2021 (excluding 2020). The ripe female model explained 63% of the deviance in CPE and identified the day of year, water temperature, moon illumination, previous autumn CPE of preferred-length fish (CPEp), and previous autumn proportional size distribution of preferred-length fish (PSDp) as influential variables. The male model explained 64% of the deviance in CPE and identified the day of year, change in barometric pressure from the previous day, water temperature, and previous autumn proportional size distribution of quality-length fish PSDq as influential variables. These findings provide useful information regarding collection of Walleye broodfish and can be leveraged to increase efficiency of future operations range-wide.

中文翻译：

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环境变量对白斑亲鱼繁殖效果的影响

玻璃斑眼鱼支持整个范围内的休闲渔业，但越来越需要每年放养来维持种群数量。在其分布的许多地区，每年都会收集白斑亲鱼并在现场人工产卵，然后将受精卵运送到鱼类养殖设施进行饲养。因此，这些计划的效率取决于亲鱼的有效捕获。使用广义加性模型，使用 2009 年至 2021 年（不包括 2020 年）的数据，解释了堪萨斯州希尔斯代尔水库育雏活动期间八个环境因素对成熟雌性斑眼鱼和雄性斑眼鱼的每次努力捕获量（CPE）的影响。成熟的雌性模型解释了 63% 的 CPE 偏差，并识别了一年中的日期、水温、月亮光照、上年秋季首选长度鱼 (CPEp) 的 CPE，和去年秋季首选长度鱼的比例尺寸分布（PSDp）作为影响变量。雄性模型解释了 64% 的 CPE 偏差，并将一年中的某一天、前一天的气压变化、水温和去年秋季质量长度鱼 PSDq 的比例大小分布确定为影响变量。这些发现提供了有关白眼亲鱼采集的有用信息，可用于提高未来范围内作业的效率。和去年秋季质量长度鱼 PSDq 的比例尺寸分布作为影响变量。这些发现提供了有关白眼亲鱼采集的有用信息，可用于提高未来范围内作业的效率。和去年秋季质量长度鱼 PSDq 的比例尺寸分布作为影响变量。这些发现提供了有关白眼亲鱼采集的有用信息，可用于提高未来范围内作业的效率。