| Indeed, the MLD maximum, usually reached in late winter determines the annual nutrient reloading of the euphotic zone. |
| Therefore the physical nutrient supply in the euphotic zone is a measure of the impact of the physical mechanisms on the primary production. |
| In general, the euphotic zone can extend to depths of 80 to 100 metres and the disphotic zone to depths of 80 to 700 metres. |
| This illuminated surface layer is called the euphotic zone, and all of the ocean's primary production occurs there. |
| This composite sample will then represent all levels of the lake water in the euphotic zone. |
| The illuminated region above it is called the photic zone, within which are distinguished the euphotic and disphotic zones. |
