Category Archives: Articles

Slide thicknesses for different types of fish scales

0.50 mm (0.020”) = Trout, salmon, tullibee 0.76 mm (0.030”) = Young fish - many species 1.00 mm (0.040”) = Bass, walleye, perch, sucker, sunfish 1.50 mm (0.060”) = Carp Tips for taking scale samples: Age determination of fish is easy if you are consistent. Take scale samples from a specific part of each fish.…
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Materials used in Wildco Van Dorn bottles

Metal parts are 304 or 316 stainless steel and are rugged, durable and lack contaminating organics. Nonmetals are flexible, blue polyurethane; rigid, white ASA plastic with silicone gasket; transparent acrylic; and opaque PVC. Internal parts are nonmetallic. Plastic samplers may use some external metal parts for durability and rigidity. Alpha™ seal - Blue, flexible polyurethane…
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Maintenance Tips for Wildco Core Samplers

Cleaning Wildco® corer valves: Keep valves and seats in corer heads free of dirt, grease and oil to maintain a good air seal. It’s best to clean valve and seat after each sample with 70% ethyl alcohol. Chemical removal of rust stains from stainless steel: Stainless steel parts may show a rust stain, indicating an…
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How to Use Whirl-Pak Bags

1. Tear off top of bag along perforation 2. Use pull tabs to open 3. Place sample in bag 4. Hold bag by wire ends and whirl 3x to close 5. Bend wire ends onto bag
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How to use Ward Counting Wheel

1. Place under a binocular dissection microscope in such a way that the groove is directly under the object lens. 2. Place a 5 to 10 mL sample in the trough. 3. The sample channel has a small plastic divider placed across the groove at one point to mark the start and finish of the…
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How to Use Sludge Judge:

1 Lower to the bottom of the tank 2 Float valve opens, allowing liquid to flow in. When filled to the surface level, tug slightly on the line as the unit is raised. 3 This sets the check valve, trapping the mixture inside 4 Read the amount of solids in the sample using the 1’…
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How to use Sedgewick Rafter Counting Cells

1. Check length and depth of your cell before use. 2. Fill cell with your sample using Hensen-Stempel pipettes. 3. Before counting, let it stand for at least 15 minutes to settle plankton. Count plankton on bottom of cell. 4. Calculate as per Standard Methods.
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How To Use Schindler-Patalas

1. Lower into water. Hinged doors open as water and plankton flow through. 2. Pull the line, trapping plankton at known depth. 3. Both doors seal against urethane gaskets to prevent loss of sample. 4. Raise above surface to collect contents in bucket.
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How to use messengers

1. Run line through messenger so tapered end points toward lower line end. 2. Run line through hole in trip release and knot securely under the handle. 3. Attach line to bottle, calibrate if desired. 4. Set stoppers in position. Pull them out of bottle end and attach cable loop to pin. When cables are…
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