Finding the "best" site depends on the specific information you're looking for (e.g., care guides, scientific data, recipes). However, here are some reputable and informative websites for learning about fish and shrimp:

• FishBase: A comprehensive global database of fish species, offering information on taxonomy, biology, ecology, and more. FishBase

• World Register of Marine Species (WoRMS): An authoritative checklist of marine species, including fish and shrimp, providing taxonomic information and links to other databases. WoRMS

• Aquatic Community: Provides information on various freshwater fish species and invertebrates like shrimp. It's useful for aquarium enthusiasts looking for care guides. Aquatic Community

• Seriously Fish: Another great resource for aquarium hobbyists that includes profiles for many species of fish and shrimp. Seriously Fish

Note: When using online resources, always cross-reference information from multiple sources to ensure accuracy, especially for care instructions or scientific data.