HYDROBIOS Ring Trawl (CalCOFI) Net

Ring Trawl (CalCOFI) Net

Oceanographic net for horizontal or oblique tows in CalCOFI design

ABOUT

Based on the design of California Cooperative Oceanic Fisheries Investigations (CalCOFI), the Ring Trawl Net today is the standard non-opening/non-closing plankton net for quantitative sampling of larger volumes of water during horizontal or oblique tows. The 100 cm diameter stainless steel ring, equipped with a 4 meter long net bag should be operated in conjunction with a 22 kg V-Fin depressor to create negative lift at the instrument. For easy retrieval the sample is concentrated inside a removable plastic net bucket with side window (covered with sieve gauze). A Mechanical Flow Meter can be fixed in the net to measure the filtered water volume.

Mesh Size

Choose an option…  1000µ780µ500µ405µ335μ300µ275µ250µ225µ200µ150µ120µ100µ Clear selection

Hydro-Bios No. 438 700 | Horizontal Oceanographic Plankton Nets

Spare Parts & Accessories

• Spare Parts
• Accessories

Spare Net Part

Spare Net Part for Ring Trawl (CalCOFI)
Net, choose mesh size

Mesh Size

Choose an option…  1000µ780µ500µ405µ335μ300µ275µ250µ225µ200µ150µ120µ100µ Clear selection

Hydro-Bios No. 438 702

Spare Plastic Net Bucket

Spare Plastic Net Bucket, consisting of:
a) Fixing Ring with over centre fasteners
for attaching to the end of a net
b) PVC-Net Bucket with side window,
covered with sieve gauze

Mesh Size

Choose an option…  500µ405µ335μ300µ275µ250µ225µ200µ150µ120µ100µ Clear selection

Hydro-Bios No. 438 955

TECHNICAL DATA
Material	Net ring: Stainless steel Net bag: MOnyl (PA) Net bucket: PVC
Dimensions	100 cm x 400 cm (dia. x l)
Weight	19 kg
Mouth opening	100 cm dia. / 0.7854 m²
Mesh size	500 microns (or as per choice between 100 and 1000 mircons)

ORDERING INFORMATION
Products
438 700	1. Bridle with thimble and shackles  2. Net ring of stainless steel, with Nylon  webbing and zip fastener  3. Net Part consisting of: a) Net Part with zip fastener, cylindrical,  diameter 1m, length 1 m, 500 microns  (or as per choice between 100 and 1000 microns) b) Net Part, conical, upper diameter 1 m,  lower diameter 11 cm, length 3 m, 500 microns  (or as per choice between 100 and 1000 microns) 4. Plastic Net Bucket, consisting of: a) Fixing Ring with over centre fasteners for attaching to the end of a net b) PVC-Net Bucket with side window,  covered with sieve gauze
Accessories
438 416	V-Fin Depressor with steel rope and shackle, weight 22 kg
438 110	Mechanical Flow Meter for counting the amount of water passing through the net
438 703	Net Part for Ring Trawl (CalCOFI) Net with bolt rope for Soft Net Bucket
438 935	Mounting ring for Soft Net Bucket
438 930	Soft Net Bucket with bolt rope
Spare Parts
438 702	Spare Net Part for Ring Trawl (CalCOFI) Net,  500 microns (or as per choice between 100 and 1000 mircons)
438 955	Spare Plastic Net Bucket, consisting of: a) Fixing Ring with over centre fasteners for attaching to the end of a net b) PVC-Net Bucket with side window,  covered with sieve gauze