1. A composition for delivering a biologically active agent in an aqueous medium comprising at least one biologically active agent, at least one bioadhesive polymer, at least one density regulating compound, and at least one nutrient. The composition of claim 1, wherein the biologically active agent is from about 0.05% to 10% by weight, the bioadhesive polymer is from about 0.05% to 10% by weight, the density regulating compound is from about 0.05 % to 30% and the nutrient is approximately 0.05% to 50% by weight. 3. A composition according to claim 1, wherein the biologically active agent is selected from biocides, drugs, nutraceuticals and mixtures thereof and said biologically active agent is dissolved in a mixture of oil and a cationic surfactant. The composition of claim 1, wherein the biologically active agent is a biocide selected from antimycin A, piperonyl butoxide (PBO), pyrethrins, rotenone and a cube plant resin other than rotenone, niclosamide, aminoethanol salt, trifluoromethyl-4-nitrophenol (TFM) and mixtures thereof. 5. The composition of claim 1, wherein the biologically active agent is a drug selected from antibiotics, antibacterial, antiviral, antifungal, antiprotozoal, antiparasitic agents and mixtures thereof. The composition of claim 1, wherein the biologically active agent comprises one or more antibiotics. The composition of claim 1, wherein the biologically active agent is a nutraceutical agent selected from proteins, peptides, fatty acids, amino acids, vitamins, carotenes, hormones, and mixtures thereof. The composition according to any one of paragraphs. 1-7, in to1. Композиция для доставки биологически активного агента в водной среде, содержащая по меньшей мере один биологически активный агент, по меньшей мере один биоадгезивный полимер, по меньшей мере одно соединение, регулирующее плотность, и по меньшей мере одно питательное вещество.2. Композиция по п. 1, в которой биологически активный агент составляет приблизительно от 0,05% до 10% п
