In areas where commercial fishing is prohibited, demographic metrics obtained from recreational fisheries and fishery-independent methods can be integral to population ecology and management. For Australian bass Percalates novemaculeata (Steindachner) and Murray cod Maccullochella peelii peelii (Mitchell), two key finfish species native to the recreational-only fresh waters of New South Wales (NSW), Australia, recreational fishing surveys were combined with electrofishing methods to capture information on spatial patterns of exploitation and variation in size. The species’ catch across NSW fresh waters (2013–2014) was estimated using a telephone-diary longitudinal panel survey and examined for spatial effects using generalised linear mixed effects models. Length data, collected through electrofishing (2013–2015), were compared among geographic zones using Kolmogorov–Smirnov tests and kernel density estimate tests. Catch patterns for each species were mainly spatially static, but significant regional differences in the size composition of both species were detected. The findings are discussed in the context of current catch-and-release practices for Australian bass and the application of size limits for Murray cod to illustrate the value of quantitative spatial information from recreational surveys and fishery-independent methods in developing evidence-based management and conservation initiatives.

中文翻译：

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大规模和分散的淡水休闲渔业中特定物种捕捞量和规模结构的空间变化

在禁止商业捕鱼的地区，从休闲渔业和渔业独立方法获得的人口统计指标可以成为种群生态和管理的组成部分。适用于澳大利亚鲈鱼Percalates novemaculeata (Steindachner) 和 Murray cod Maccullochella peerii peerii(Mitchell) 是澳大利亚新南威尔士州 (NSW) 纯休闲淡水水域的两种主要有鳍鱼类，休闲捕鱼调查与电钓方法相结合，以获取有关开发的空间模式和大小变化的信息。使用电话日记纵向面板调查估计了该物种在新南威尔士州淡水（2013-2014 年）的捕捞量，并使用广义线性混合效应模型检查了空间效应。通过电捕（2013-2015 年）收集的长度数据，使用 Kolmogorov-Smirnov 检验和核密度估计检验在地理区域之间进行了比较。每个物种的捕获模式主要是空间静态的，但检测到两个物种的大小组成存在显着的区域差异。