661 research outputs found
Fish tracking technology development. Phase 1 project definition desk study
The document reports on Phase 1 of a definition study to appraise the options to develop fish tracking equipment, in particular tags and data logging systems in order to improve the efficiency of the Environment Agency's tracking studies and to obtain a greater understanding of fish
biology.
Covered in this report are radio telemetry, audio telemetry, High Resolution Position Fixing, data storage and archival tags and other fish tracking systems such as biosonics
Evaluation of NRA tracking studies. Future projects and technical development
Fish tracking is a valuable technique for the provision of detailed information on the
behaviour patterns of individual fish especially during estuarine and riverine migration.
2. Tracking studies help in the provision of a comprehensive description of the variety offish
behaviour patterns in response to factors such as water flow, obstructions and water
quality.
3. There are advantages to be gained by complementing fish tracking studies with data
collected from fish counters and vice versa.
4. An overall evaluation of NRA fish tracking projects is presented in the wider context of
NRA strategic research objectives.
5. The requirement for future development of tracking equipment, improved data analysis
techniques, better communication and more immediate report preparation is identified.
6. Individual project evaluation is given for NRA (or the appropriate Water Authority
predecessor) tracking studies conducted on the Ribble estuary, the River Tamar, River
Torridge, Rivers Test and Itchen, River Lodden, the Welsh River Dee, River Glaslyn,
River Taff, River Tawe, River Tywi, River Usk, Rivers Avon and Stour and the River
Frome.
7. An outline for future strategic research is provided which identifies particular areas for
study:-
i) Identification of environmental factors which control the entry of fish into rivers.
ii) Improvement of the understanding of the relationship between water flow and
upstream movement of salmonids.
iii) Examination of the detailed movements and behaviour of fish in relation to
obstructions.
iv) Closer definition of water quality requirements for salmonid fish.
v) Definition of habitat preferences of salmonids in rivers.
vi) Subsidiary topics such as the movements of non-salmonid fish and the downstream
migration of kelts and juvenile salmonids
Implantable acoustic-beacon automatic fish-tracking system
A portable automatic fish tracking system was developed for monitoring the two dimensional movements of small fish within fixed areas of estuarine waters and lakes. By using the miniature pinger previously developed for this application, prototype tests of the system were conducted in the York River near the Virginia Institute of Marine Science with two underwater listening stations. Results from these tests showed that the tracking system could position the miniature pinger signals to within + or - 2.5 deg and + or - 135 m at ranges up to 2.5 km. The pingers were implanted in small fish and were successfully tracked at comparable ranges. No changes in either fish behavior or pinger performance were observed as a result of the implantation. Based on results from these prototype tests, it is concluded that the now commercially available system provides an effective approach to underwater tracking of small fish within a fixed area of interest
Fish tracking technology development. Phases 1 and 2, project definition desk study and equipment
The document reports on the major findings from a definition study to appraise the options to develop fish tracking equipment, in particular tags and data logging systems, in order to improve the effeciency of the Agency tracking studies and to obtain a greater understanding of fish biology. The definition study was in two parts. The first, Phase 1, collated and evaluated all the known tracking systems that may be suitable for studies of fish which are either produced commercially or have been constructed for specific in-house studies. Phase 2 was an evaluation of all the tracking equipment considered to merit further investigation in Phase 1. The deficiencies between existing and required technologies to improve the efficiency of Agency's tracking studies and to obtain a greater understanding of fish biology are also identified
Fish tracking using detection in Aquaculture: A Pilot Study
Use two different detection models and combine them with a tracking algorithm to be able to track fish that can be used in further fish welfare applications.Use two different detection models and combine them with a tracking algorithm to be able to track fish that can be used in further fish welfare applications
FishMOT: A Simple and Effective Method for Fish Tracking Based on IoU Matching
The tracking of various fish species plays a profoundly significant role in
understanding the behavior of individual fish and their groups. Present
tracking methods suffer from issues of low accuracy or poor robustness. In
order to address these concerns, this paper proposes a novel tracking approach,
named FishMOT (Fish Multiple Object Tracking). This method combines object
detection techniques with the IoU matching algorithm, thereby achieving
efficient, precise, and robust fish detection and tracking. Diverging from
other approaches, this method eliminates the need for multiple feature
extractions and identity assignments for each individual, instead directly
utilizing the output results of the detector for tracking, thereby
significantly reducing computational time and storage space. Furthermore, this
method imposes minimal requirements on factors such as video quality and
variations in individual appearance. As long as the detector can accurately
locate and identify fish, effective tracking can be achieved. This approach
enhances robustness and generalizability. Moreover, the algorithm employed in
this method addresses the issue of missed detections without relying on complex
feature matching or graph optimization algorithms. This contributes to improved
accuracy and reliability. Experimental trials were conducted in the open-source
video dataset provided by idtracker.ai, and comparisons were made with
state-of-the-art detector-based multi-object tracking methods. Additionally,
comparisons were made with idtracker.ai and TRex, two tools that demonstrate
exceptional performance in the field of animal tracking. The experimental
results demonstrate that the proposed method outperforms other approaches in
various evaluation metrics, exhibiting faster speed and lower memory
requirements. The source codes and pre-trained models are available at:
https://github.com/gakkistar/FishMO
Review of NRA tracking projects on salmon, Salmo salar L., and sea trout, Salmo trutta L
The report briefly outlines the programme of the National Rivers Authority (NRA), placing the Fisheries programme in the context of the work of the NRA as a whole, and viewing
the tracking work against the broader requirements of the NRA Fisheries research programme. All regions of England and Wales are considered.
Two techniques currently exist for studying the detailed timing and extent of movements of adult salmon: tracking of individually identifiable fish, and counting the numbers of fish moving past a fixed point in the river. The development of tracking techniques and the integrated use of tracking and fish counters is briefly reviewed in Section 3. Further details of these techniques are given in Appendices. Section 4 summarises and assesses completed and current NRA tracking studies.
Section 5 discusses the scientific content of these studies in relation to similar work carried out elsewhere in the UK. The NRA programme of tracking studies is evaluated in Section 6. Section 7 discusses future fisheries projects and Section 8 details the future development of tracking techniques.
Finally, recommendations arising out of this review are summarised in Section 9
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