Why fish can be kept in a small aquarium in the winter but not in the summer?

What kind of reproduction do bluegill have? Do angel sharks live in the bottom of the ocean? Can you suggest a new baked salmon recipe for lent? Are fish vertebrates of invertebrates? 55gal tank with 10 tiger barbs 12 neons 3 bala sharks 5 guppies 2 corie cats 2 dwarf gouramis 1 Chinese algae eater 1 catfish and 1 plecostomus is that too many fish? How do you keep blue herons out of your pond? Pretty little female fish in French? Where would you be most likely to see a flying fish? Can albino convict cichlids breed? Are sardines freshwater or salwater fish? Do bettas need height or width in a tank? What is english of bisugo? How long do a regular fish live? How many cells and cell structure does a great white shark have? What is another name for the fish called marlin? What is the second biggest fish? When can you put goldfish into a tank of clean water? How can you tell the sex of Betta fish? What are the advantages of LED lighting in an aquarium? What do mermaids weigh?