Somehow, intensive aquaculture seems to have avoided the close scrutiny of the economics of diminishing returns. The basic costs for low management catfish production, feed ($630; $0.14/lb) and fingerlings ($225; $0.15/fish), would be $855/acre.ow density, autumn stocking in combination with temperature-based feeding substantially increased channel catfish fingerling weight by the subesequent spring. The advanced spring fingerling size (0.19-lb) allowed production of a 1.45-lb food-fish (1343 fish/acre) in 180 days.
Overview. Croup or Acute Laryngotracheobronchitis (ALTB) is a viral infection of the throat (upper airway). The virus causes swelling of the voice box (larynx) and windpipe (trachea). The swelling narrows the airway and makes breathing hard.
Croup is a condition where the trachea (the tube carrying air to the lungs) and the vocal cords are swollen and may have some muscle spasm. It's usually caused by a virus. Croup causes a hoarse, barky cough (like the barking of a seal) and noisy breathing. Fever, runny nose, and a hoarse voice may also be present. If your child's croup was caused by a virus, it may have easily been caught from someone who has a cold or respiratory infection.