Summarize the following:
If you're having difficulty determining the sex of your fish, go to a fish store or hatchery where you can purchase fish. Talk to an associate about the kind of fish that you have, and bring pictures of the fish if you can. They might be able to identify the sex for you, or direct you to someone who can help. While most pet store employees aren't trained on all of the types of fishes, they may have a fish expert who works in the store. Never remove your fish from your tank to take it to a store or hatchery. This can make the fish stressed, which can kill it. Hatcheries can also give you advice on how to breed your male and female fish to produce eggs during spawning season. Search on YouTube for the species of fish that you have and the word "sexing" to see videos of experts and breeders identifying the different characteristics. This can help you get a visual idea of what to look for on male and female fish. Make sure you're watching videos about the species and types of fish that you have. It can be easy to get confused between videos! Since there are so many different types of fish, it's best to start your research by looking up the fish that you have. Visit a local library to check out books like the Encyclopedia of Fish Physiology, which contains information about many different types of fish. Look for sections about classification and "sexing" fish. For example, if you have all tropical fish in your tank, you can check out a book about tropical fish. There are many online forums devoted to marine breeding, fish keeping, and tank setups. If you have a question about determining the sex of your fish, post pictures of the fish on the forum and ask the community members to help you out! Chances are, someone will have a good answer for you. Try to be as specific as possible in your post by including the species and type of fish, and label your pictures as necessary to ensure that anyone who sees them will know what they're looking at. Remember to check back on the forum frequently to see the answers from community members.

summary: Visit a local pet store or hatchery to talk to an expert. Consult online resources like informational videos and pictures. Read about the types of fish that you have in your tank. Ask questions on online forums to get answers from fish enthusiasts.

Summarize the following:
It's the icon with the Apple logo in the upper-left corner of the menu bar. This displays the Apple menu as a drop-down. It's the second option in the Apple menu drop-down. This opens the System Preferences window. It has an icon that resembles a computer monitor. This opens the Displays window. When you press "Options", a button that says "Detect Displays" appears in the Displays window. It's in the lower-right corner of the Displays window when you press the "Options" key. This makes MacOS detect your displays.

summary: Click the Apple icon . Click System Preferences. Click Displays. Press and hold Options. Click Detect Displays.

Summarize the following:
When pruning young trees, you create the shape and structure of the tree for its entire life. Your later prunings are to maintain the structure and polish up the appearance of your tree. To do this, look for any new, fresh branches and cut them off with your garden shears. Just like you did when pruning your young trees, inspect your trees for branches below 45ft (1.21.5m), and look for any damaged branches or discolored areas. If you find any low-hanging or sickly branches, cut them off at a 45-degree angle near the trunk. This keeps your tree healthy as it continues to grow and produce walnuts. You can use your garden shears, as these branches shouldn't be very thick. As new branches grow, they may take a forked appearance or may start to grow across one another. If you notice any forked or crossed branches, cut them off using your garden shears or hand saw. Make your cut as close to the trunk of the tree as you can, and use a 45-degree angle as you cut. If you'd like, you can remove the smaller of the forked branches and keep the larger section. Do this if the branch is towards the top middle of the tree and if it looks attractive.
summary: Prune mature trees once every 3-5 years to preserve their shape. Cut off low or damaged branches to maintain the central leader shape. Remove any forked or crossing branches to keep your tree healthy.