You can use almost any container or net, depending on what you want to do with the sample. If you need to quantify your sample, a 350ml Clarke dipper is often used. Then with a pipette you can put them in a tube. Use 70% ethanol to preserve them.

When the larvae are mature or nymphs, they may tend to swim to the bottom to hide, it is necessary to approach gently to have a representative sample. If you use a large container, you should not put it too steeply in the water because you may end up with a lot of sediment.

I am using the spoon's plastic materials.

As my experience, that is depnd on mosquito species, but all mosquio larvae are found in stand or nearly stand shadow water resources. Generally, Culex spp. breeding in brakish water rich with organic matter, Anopheles spp. in clear water. to collect for establish a new colony, third and fourth instars are more easyly with successful result. Handle mesh good tools at early morning as collecting time. During rainful seasons with moderate termpreture give good opportuinty to found natural mosquito populations.

Mosquito samples are collected from the edges of ponds and stagnant water using small containers with a capacity of 250 to 500 ml, where the larvae are observed swimming up and down to and from the surface, because they need free air to breathe. Then it is placed in larger containers of 1 liter capacity and is supplied with food such as biscuits and yeast in a ratio of 3 to 1 or ornamental fish food, in order to develop the colony.