PIT Tag Sizes and Dimensions

Overview
PIT tags are available in multiple sizes to meet the biological and research requirements of different fish species. The size of a PIT tag directly affects retention rate, reading performance, implantation success, and long-term tracking reliability. As a professional manufacturer of FDX-B and HDX PIT tags, we supply a full range of dimensions from ultra-small 1.25×7 mm to large 4×34 mm tags, suitable for salmon, trout, eels, sturgeon, and many other aquatic species. All tags are encapsulated in high-strength biocompatible glass to ensure durability in freshwater, seawater, and harsh field environments.

Available PIT Tag Sizes

FDX-B PIT Tags

• 1.25 × 7 mm

• 1.4 × 8 mm

• 1.5 × 8 mm

• 2 × 6 mm

• 2 × 8 mm

• 2 × 10 mm

• 2 × 12 mm

• 3 × 13 mm

• 3.85 × 23 mm

• 3.85 × 32 mm

• 4 × 34 mm

HDX PIT Tags

• 2 × 12 mm

• 3 × 13 mm

• 3.85 × 23 mm

• 3.85 × 32 mm

• 4 × 34 mm

All sizes support ISO 11784/11785 compliance.

How PIT Tag Size Affects Performance

1. Reading Distance

Larger tags house longer antennas, resulting in stronger coupling and longer read ranges.
Typical performance (depends on antenna system):

• 8 mm tags: short/medium distance, ideal for juveniles

• 12 mm tags: standard hatchery size with stable read range

• 23–34 mm tags: high-power tags for river arrays and wide gate detection

2. Fish Health and Implantation Success

The general guideline from hatcheries and research agencies is:

• Use 8 mm for small juveniles and delicate species

• Use 12 mm for salmon and trout above a specific fork length

• Use 23–34 mm for large adult fish and wildlife monitoring projects

3. Retention Rate

Retention usually increases when using a tag sized appropriately for fish body mass.
Examples from field studies:

• 8 mm for juveniles: strong retention in early life stages

• 12 mm for smolts: proven stable performance during migration

• 23–34 mm: high retention in adult monitoring programs

4. HDX vs FDX-B Performance

Although both formats support similar biological safety, they behave differently in size-dependent scenarios:

• FDX-B small tags (7–12 mm) are ideal for lightweight implantation

• HDX typically performs better with larger tags (23–34 mm) due to higher energy needs

Recommended PIT Tag Size by Species

Salmon (Chinook / Coho / Sockeye / Atlantic)

• Best size: 12 mm FDX-B

• Juveniles: 8 mm FDX-B

• Adults: 23–32 mm HDX or FDX-B

• Link: /pit-tags-salmon/

Trout (Rainbow / Steelhead / Brown / Brook)

• Best size: 12 mm FDX-B

• Juvenile trout: 8 mm FDX-B

• Large wild trout: 23 mm

• Link: /pit-tags-trout/

Eels / Lamprey

• Best size: 8 mm or 12 mm depending on body diameter

• Link: /pit-tag-8mm/

Sturgeon / Large Catfish

• Best size: 23–32–34 mm tags

• Link: /pit-tag-23mm/

Material and Construction

All PIT tags are manufactured using bio-glass sealed with laser welding, ensuring:

• Corrosion resistance in saltwater

• Protection against pressure and shock

• Long-term stability (>10 years)

• Smooth surface for safe implantation

• High transparency for visual QC inspection

Internal components include:

• Precision copper coil antenna

• High-stability IC chip (FDX-B / HDX)

• Hermetically sealed glass tube

Injector Compatibility

To ensure correct implantation depth and minimal tissue damage, each PIT tag size must match the correct needle or injector.

Common Injector Pairing

Link: /pit-tag-injector/

Quality Testing and Performance Verification

Before shipment, each PIT tag undergoes:

• Frequency calibration

• Injection strength test

• Waterproof immersion (48 hours)

• Reading distance test

• Pressure test

• Visual glass integrity inspection

• Tag ID uniqueness verification

This ensures consistent performance across all batches.

Bulk Supply for Hatcheries and Research Programs

We support universities, hatcheries, and long-term migration projects with:

• OEM/ODM sizes

• Pre-encoded ID ranges

• Antenna + reader + tag complete solutions

• Custom packaging for field deployment

• Fast global delivery

• Stable multi-year supply guarantees

Why Order PIT Tags from DO RFID TAG Manufacturer

You can rely on us for:

• Full range of PIT tag sizes (7–34 mm) in both FDX-B and HDX formats

• Professional construction using biocompatible high-strength glass

• Stable read performance with verified coil sensitivity

• Consistent quality across millions of units

• Customization for research institutions and government agencies

• Reader + antenna + PIT tag system support

• Competitive wholesale pricing and factory-direct delivery

Our engineering team works directly with hatcheries, researchers, and environmental projects, ensuring your tagging program receives complete technical support.

Internal Links

• /pit-tags/

  
  

• PIT Tag Injector
  
  

• PIT Tags for Salmon
  
  

• PIT Tags for Trout
  
  

• FDX-B vs HDX Comparison
  
  

• 8 mm PIT Tags
  
  

• 12 mm PIT Tags