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Place a spawn net on a flat surface. Scoop 6-20 eggs into the center of the mesh sheet. Place 3 to 5 small bait floats on top of the eggs. Grab the four corners of the mesh sheet and twist the top. Tie the top of the bag with thread. Cut the excess mesh from the top of the bag.
You can purchase spawn nets, or 4 by 4 inch (10 cm × 10 cm) mesh sheets, online or at a fishing store. These sheets are created specifically to hold eggs as bait and usually come in packages of 25 or 50.  Yellow sheets are better if you’re fishing in murky water. Red sheets are more alluring to fish if you’re fishing in clear water. The more eggs that you place in each roe bag, the larger your bait will be. If you are fishing for larger fish, like trout, you’d want to make the roe bag bigger to better attract them. If you are fishing for smaller sized fish, like sunfish, make the roe bag small enough to fit in their mouth. You can purchase salmon egg bait at a fishing store or online. Bait floats are small plastic balls that will keep the roe bag floating in the water in stronger currents. Adding these small bait floats to the roe bag will prevent it from scraping the bottom and can prevent your bait from getting caught on rocks. The bait floats should be about the same size as your salmon eggs. Carefully grab the four corners of the mesh and bunch it up over the eggs. Then, twist the top of the mesh so that it creates an egg sack. Twist it 2-3 more times to secure the sack in place. Do not squeeze the eggs or you may pop them. Wrap a piece of thread around the top of the bag 5-7 times. Then, tie the end of the thread with a knot to hold the eggs in place. You can use a special type of string called Tackle Spider Thread, that will hold the bag in place without having to tie a knot. Use a pair of scissors to cut 2–3 centimetres (0.79–1.18 in) from the thread to remove the extra mesh from the top of the bag. You should now have a tight bag of eggs that you can use for bait.  If you don’t plan on using the bags immediately, you can store them in the refrigerator for up to 3 months. Most roe bags are 1–2 inches (2.5–5.1 cm) in diameter. If the roe bags look white or discolored over time, it means they are going bad and you should create fresh bags.