1 Outdoor air pollution can cause ongoing throat irritation. Indoor pollution â tobacco smoke or chemicals â also can cause a chronic sore throat. Chewing tobacco, drinking alcohol and eating spicy foods also can irritate your throat.  Muscle strain.
Biosecurity is key to productive aquaculture systems. Biosecurity encompasses all measures designed to prevent diseases from occurring and from spreading by isolating, as much as possible, animal farm populations from external contamination. Recurring or prolonged contact with external environments (water, sediment, wildlife) favors the development of new diseases.
The depth at which the disk is no longer visible is taken as a measure of the transparency of the water. This measure is known as the Secchi depth and is related to water turbidity.Since its invention, the disk has also been used in a modified, smaller 20 cm (8 in) diameter, black and white design to measure freshwater transparency. Secchi disk measurement should always be taken off the shady side of a boat or dock between 9 am and 3 pm The period for best results is between 10 am and 2 pm. The same observer should take Secchi depth measurements in the same manner every time.