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 swelling of the voice box (larynx) and windpipe (trachea). Croup can be caused by allergies, bacteria, or inhaled irritants, but it's usually the result of a virus.Most of the time, the culprit is the parainfluenza virus, but other viruses â respiratory syncytial virus (RSV) , adenovirus, influenza, and measles, for example â can also trigger croup.Croup is most common in children between the ages of 3 months and 5 years, although a child can get croup at any age.The illness shows up most frequently in the colder months â between October and March.roup is most common in children between the ages of 3 months and 5 years, although a child can get croup at any age. The illness shows up most frequently in the colder months â between October and March.