Brown trout 29-year dataset - Glenariffe Stream, New Zealand

Globally, many large rivers are modified to meet human needs, often with adverse impacts on fish populations. In New Zealand, such rivers support important recreational brown trout (Salmo trutta) fisheries, but understanding of river alterations on trout is limited. This study utilized New Zealand’s most extensive brown trout dataset from Glenariffe Stream (1965–1993). Annual brown trout spawning numbers varied eight-fold; larger runs had more small, first-time spawners, while smaller runs were sustained by return spawners. Spawning timing differed by sex, with larger fish arriving two months later than initial smaller spawners. Juvenile outmigration was driven by water level, time of year, and lunar phase. Tagged fish data highlighted the significance of longitudinal connectivity for post-spawning adults, particularly females, which travelled over 100 km downstream to estuarine habitats to rapidly regain condition. Collectively, our findings quantify the inherent annual variability in ..., , , # Brown trout 29-year dataset - Glenariffe Stream, New Zealand

[https://doi.org/10.5061/dryad.s7h44j1hp](https://doi.org/10.5061/dryad.s7h44j1hp)

## Description of the data and file structure

The importance of river connectivity in maintaining headwater brown trout *(Salmo trutta)* stocks in a New Zealand river – results from a 29-year study.

Study authors: Phillip G. Jellyman and Donald J. Jellyman

Corresponding Author:

Phillip G. Jellyman, National Institute of Water and Atmospheric Research Ltd., P.O. Box 8602, Christchurch, New Zealand.

Email: [[e-mail], ](mailto:[e-mail])Phone: [phone]

Data of data collection: 1965–1993

Location of primary data collection: a counting fence across Glenariffe Stream approximately 200 m above the confluence with the Rakaia River, Canterbury, New Zealand.

There are multiple datasets in this Microsoft Access Database file. These are primarily: adult salmonid trap, salmonid fry trap, tag return loca...,