Ideal for vertical plankton tows when you need to sample a specific stratum in an integrated water column.

After you’ve reached your desired depth and taken your sample, close the net by sending a messenger down the line, ensuring no further water gets through. Raise vertically at an even speed of 0.5 m/s. The truncated design improves filtration efficiency and consists of four parts: a tapered upper cylinder, the closing portion; a conical filtering net; an attached dolphin adapter; and a stainless steel Wisconsin dolphin bucket whose 10 oz. weight insures the net’s rapid descent. The closing portion consists of top nickel plated brass spring attached to a bridle, towing eye and release tab. A separate lowering and retrieval line is attached to the middle ring between the two cones.

Includes:

• Birge Closing Net 80 um mesh (3-21-C30)
• Adapter (3-48-C60)
• 200 mL Wisconsin Bucket 80 um mesh (3-40-D80)
• Polyester 3/16" line 100ft hank (3-62-C15)
• Messenger, Solid 8 Oz SS (3-46-D80)