Salinity, Temperature and Depth Archival Tag

High performing and long life salinity logging tag for fish and marine animals. Wide salinity range. Long battery life.

For long term fish tagging studies, the CTD tag is one of a kind archival tag due its small size and a salinity sensor in addition to temperature and depth measurements.

Key features

  • Smallest CTD data storage tag on the market
  • Long battery life - up to 5 years
  • Depth sensors for shallow to deep ocean
  • Tag holder kit for external fish tagging
  • User defined text on the housing
  • Description

    Smallest CTD on the market

    The DST CTD Data Storage Tag measures and records salinity, temperature and depth. Size is only 50 mm in length x 15 mm in diameter. It is a self-contained CTD data logger that is user programmable to log the data in the memory at certain sampling interval. The collected data is displayed in a graph and table with a time stamp for each measurement.


    DST CTD is designed as a fish archival tag for migration studies of fish and marine animals. It enables scientists to gain valuable information on migration routes and behavioural patterns over a long period of time. The tag needs to be externally attached to the animal, due to the salinity sensor which consists of two conductivity cells. For using the CTD on a mooring or subsea gear, click here.

    Wide salinity range, low to high conductivity

    The DST CTD can capture conductivity from 3 to 68 mS/cm. Low conductivity range, 0.1–6 mS/cm, is also available, ideal for measuring in brackish water.

    Depth sensors from shallow water to deep ocean

    The tag can be calibrated to 2,400 meters, with tolerance up to 2,500 meters. More shallow water is also available, with a wide variety of ranges: 0,1m-100m, 5m-500m, 5m-1200m, 10m-2400m.

    Tag holder kit ensures easier and safer attachment

    Due to the salinity sensor, it needs to be external on the animal. A tag holder kit is available for the tags, to make the tagging process easier. It also increases the safety for the fish.

    Customer defined text on housing for recapture purposes

    For tag and release of animals into the wild the tags can have a customized text on the housing, for recapture purposes. It is important to have the return information when the tags are used on commercially fished species, so that fishermen can return a tag with valuable data to the scientist. Normally there is a reward for return.