... of food organisms of different sizes and nutritional composition provide maximal chances for meeting all the requirements of the predator larvae. Although the collection and/or production of ... plankton for feeding in commercial hatcheries may therefore appear evident, in practice the use of natural plankton often entails many constraints which will be explained in detail in chapter 5. For ... prior permission of the copyright owner. Applications for such permission, with a statement of the purpose and extent of the reproduction, should be addressed to the Director, Information Division,...