North Sea shrimps, also known as Nordseekrabben, can typically be stored in the refrigerator for up to 2-3 days. It is important to keep them in an airtight container or sealed bag to maintain freshness. It is recommended to consume them as soon as possible for the best taste and quality. **

Shrimps reproduce through a process called sexual reproduction. Female shrimps release eggs into the water, which are then fertilized by male shrimps who release sperm. The fertilized eggs hatch into larvae, which eventually develop into juvenile shrimps. Shrimps have complex mating rituals and behaviors to ensure successful reproduction. **

It is possible that the Amano shrimps have disappeared from their tank due to a variety of reasons. They may have been eaten by other tank inhabitants, died from illness or stress, or simply hidden themselves in the tank's decor. It is important to thoroughly search the tank and observe the behavior of other tank inhabitants to determine the fate of the Amano shrimps. Additionally, checking water parameters and ensuring proper tank conditions can help prevent future disappearances. **

Amano shrimps reproduce through a process called sexual reproduction. The female shrimp will carry fertilized eggs underneath her abdomen until they hatch into larvae. The larvae will then go through several stages of development before becoming fully grown shrimps. In order to successfully breed Amano shrimps in a home aquarium, it is important to provide them with the right water conditions and a suitable environment for the larvae to develop. **

Shrimps have brown stripes as a form of camouflage to help them blend in with their natural environment. The brown stripes help them to hide from predators and also to sneak up on their own prey. This adaptation allows them to survive in their habitat and increases their chances of survival. **

Shrimps are naturally shy and reclusive creatures, and they often hide during the day as a way to protect themselves from potential predators. They may also be seeking shelter and security in their environment, such as in plants or decorations within the aquarium. Additionally, shrimps are sensitive to changes in their environment, so they may hide if they feel stressed or if water parameters are not ideal. Providing plenty of hiding places and ensuring a stable and comfortable environment can help to reduce their stress and encourage them to come out more. **

No, the purchased shrimps are not already 12 months old. Shrimps typically have a lifespan of 1-2 years, so they would not be sold at 12 months old. Shrimps are usually harvested and sold when they are around 6-12 months old, depending on the species and size desired by consumers. **

I'm sorry, but as an AI, I am unable to physically inspect the shrimps to determine if they are still edible. However, if the shrimps have been stored properly in the refrigerator and have not passed their expiration date, they should still be safe to eat. It is always best to use your judgment and follow food safety guidelines to ensure the shrimps are safe for consumption. **