How does the breeding net tank work with fry I know they fall into a separate section of it but my question is do need air because there no access in bottom tank?

A breeding net tank, also known as a maternity tank or breeder box, is a specialized tank designed to provide a safe and controlled environment for breeding and rearing fry (baby fish). Here's how it works:

1. Tank Structure: A breeding net tank typically consists of two compartments:

- Upper Compartment: This is the main compartment where the adult fish (usually the female) is placed during the breeding process. It has a fine mesh or net bottom that allows water to flow through but prevents the adult fish from reaching the lower compartment.

- Lower Compartment: This compartment is located beneath the upper compartment and is where the fry will fall and grow. It has a solid bottom and is designed to provide a safe and protected space for the fry to develop.

2. Water Flow: The breeding net tank is usually connected to an air pump and sponge filter, which provides a gentle water flow within the tank. The filter helps keep the water clean and well-oxygenated for both the adult fish and the fry. The water flows through the mesh bottom of the upper compartment, passes through the sponge filter, and returns to the tank, creating a continuous flow of oxygenated water.

3. Fry Care:

- Separation: The mesh or net bottom of the upper compartment ensures that the adult fish cannot reach the fry in the lower compartment. This separation prevents the adult fish from accidentally eating their offspring or disrupting their development.

- Food: The fry can be fed specialized fry food or finely crushed flakes through the mesh bottom of the upper compartment. The food particles will fall into the lower compartment where the fry can easily consume them.

- Water Quality: Maintaining good water quality is crucial for the survival of the fry. Regular partial water changes should be performed to remove any waste or uneaten food from the lower compartment.

4. Access to the Bottom Tank: While there may not be direct access from the upper compartment to the bottom tank, breeders typically lift the upper compartment out of the lower one to perform maintenance, feed the fry, or transfer them to a grow-out tank once they are large enough.

5. Air Supply: The breeding net tank usually requires an air supply for the sponge filter to provide adequate oxygenation. The air pump is connected to the sponge filter, and the filter generates small bubbles that help oxygenate the water. This is important for both the adult fish and the fry, as they have a higher oxygen demand.

It's worth noting that breeding net tanks are not suitable for long-term housing of fry. Once the fry have grown large enough to fend for themselves, they should be transferred to a larger grow-out tank to allow for proper growth and development.