Quick answer: Acoustic data in fisheries is the recorded output from instruments like a scientific echosounder: transmitted pings, received echoes, and metadata (time, position, settings). It’s used to estimate fish and biomass distribution by analyzing backscatter strength across depth and along survey routes, then converting it into indicators, maps, and full-resolution datasets for later processing.
| Data type | What it contains | Typical use |
|---|---|---|
| Raw / full-resolution acoustic data | High-detail ping-by-ping records | Post-processing, QA, reporting |
| Reduced “indicators” | Summaries (depth bins, time windows) | Live monitoring, quick decisions |
| Echogram (visual) | Display of backscatter vs depth/time | Interpretation and quality checks |
| Metadata | Position, time, settings, platform state | Traceability and correct processing |
Acoustic data is not a single file type—it’s a family of records that together describe what was transmitted, what was received, and under what conditions.
At minimum, fisheries acoustic data includes:
This is the most detailed record. It’s larger, but it supports:
These are compressed summaries that can be transmitted during a mission (e.g., over Iridium) and used for operational steering:
These are processed outputs:
These are interpretations of patterns in the echogram and derived metrics.
Is acoustic data the same as an echogram?
An echogram is a visualization made from acoustic data. The data itself is the underlying record.
Why keep full-resolution data if indicators exist?
Indicators are great for steering a mission. Full-resolution is needed for defensible analysis and reprocessing.
Can acoustic data be collected from a USV?
Yes—provided the platform can hold stable operation, log metadata, and manage power/data handling for long missions.