Joachim B. Bretzel

Joachim B. Bretzel
Charles Sturt University · Gulbali Institute

Doctor of Philosophy
Fisheries Project Officer at AFPS

About

8
Publications
1,988
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
47
Citations
Introduction
I am an applied ecologist with a strong focus on freshwater fish conservation. Topics I have worked on or am currently focusing on are habitat use and connectivity, restoration, community ecology, invasive species, feeding ecology, fish passage, fisheries management, and hydro-ecological engineering. For my PhD I studied fish screens at Australian water diversions to protect aquatic biota and endangered fish species.
Additional affiliations
January 2018 - October 2018
Zoologische Staatssammlung München
Position
  • Student assistant
Description
  • - Sorting and digitalization of the collection - Species identification - Maintenance work - Systematics and species traits
September 2015 - March 2016
NORCE Norwegian Research Center
Position
  • Internship and Bachelor Thesis
Description
  • - Ecological fieldwork - Fish monitoring - Fish Counting - River Restoration - Macroinvertebrates/Laboratory - GIS
Education
March 2020 - September 2024
Charles Sturt University
Field of study
  • Fisheries studies
October 2017 - August 2019
Technische Universität München
Field of study
  • Landscape planning, Ecology and Nature Conservation
October 2013 - July 2017
Technische Universität München
Field of study
  • Landscape planning

Publications

Publications (8)
Article
Full-text available
Millions of native fish are entrained into irrigation pumps in Australian rivers every year. It is often assumed these fish are wild, but stocked fish may also be affected. During fish entrainment surveys at two pump intakes on the Macquarie River, New South Wales, a noticeable increase of entrained juvenile Murray Cod ( Maccullochella peelii ) was...
Article
Full-text available
Fish protection screens are being increasingly applied to prevent fish entrainment at water diversions and intakes. Screen success is thought to depend upon selecting the most suitable mesh size and ensuring appropriate water velocities around the screen. It is generally hypothesised that if fish are smaller than the mesh size, they may become entr...
Article
Full-text available
This study investigates the effect of large woody debris (LWD) on the abundance of juvenile Atlantic salmon (Salmo salar, L.) and anadromous brown trout (Salmo trutta, L.) in semi-alluvial side channels of the river Aurlandselva (Norway) using point electrofishing and microhabitat mapping. Not the presence of LWD, but stream bed shelter availabilit...
Article
Full-text available
Each year, millions of fish are extracted from Australian waterways by the pumping and diversion of water into irrigation systems. Fish protection screens can help reduce these losses but are largely untested in Australian rivers. In this study, a large, gravity‐fed irrigation offtake on Gunbower Creek, Victoria, Australia, was investigated for fis...
Article
Full-text available
The three-spined stickleback Gasterosteus aculeatus invaded Lake Contance in the 1940s and expanded in large numbers from an exclusively shoreline habitat into the pelagic zone in 2012. Stickleback abundance is very high in the pelagic zone in winter near the spawning time of pelagic whitefish Coregonus wartmanni, and it is hypothesized that this i...
Article
Full-text available
The fish community of Lake Constance, a large, deep, oligotrophic lake has undergone drastic changes in recent years, with the sudden rise to dominance of invasive three-spined stickleback (Gasterosteus aculeatus) in the pelagic zone, a rather atypical habitat for this species in Central Europe. The core objective of this study was to compare the f...
Article
Full-text available
A main driver of biodiversity loss is the transformation of pristine habitats into agricultural land, plantations of exotic trees, and settlements. The cloud forest of the Taita Hills in southern Kenya has suffered under such transformation processes. In consequence, remaining forests are small and isolated and often provide degraded forest habitat...
Article
Full-text available
Based on six weeks spent in the field on six Cabo Verdean Islands in September/ October 2016 and 2017, we present 18 additions to the checklist of terrestrial biodiversity of the archipelago (ten arthropods, one bird, two fungi, and five flowering plants). Four of them are first records for Cabo Verde, the others for particular islands. Most intere...

Network

Cited By