By John Mosig, Ric Fallu
A pragmatic advisor that covers vital features of aquaculture together with food, breeding, fish healthiness, harvesting and advertising and marketing.
Read Online or Download Australian Fish Farmer: A Practical Guide to Aquaculture, Second Edition (Landlinks Press) PDF
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Extra info for Australian Fish Farmer: A Practical Guide to Aquaculture, Second Edition (Landlinks Press)
Another form of feedlotting is being carried out with abalone and is based on growing abalone in cages set on the seafloor. The farmer grows the type of seaweed that abalone enjoy and feeds it to the abalone on the cages. The design of the cage ensures good tidal water exchange and that predators are kept out. Feedlot operations can be expensive to establish and operate. There may be an opportunity to feedlot other commercial species but the value would need to be high to warrant the risk and the outlay.
Often, it is not the warm part of the year that beats you – it’s the winter months that bring the water temperatures down (see chapter 10 where we look at site selection). Subtropical species As the name implies, these species are suitable for culture in subtropical climates. Subtropical Australia covers the country along the coast where there is the moderating influence of the oceans buffering the extreme low temperatures of an inland winter but doesn’t have the extreme high temperatures of the country that sits north of the Tropic of Capricorn.
These organisms all use oxygen and the amount of oxygen they use is called the biochemical oxygen demand or BOD. 1. Biochemical oxygen demand (BOD). In A the biomass has surplus oxygen in the system. In B the activity of the system’s biomass has utilising all the available oxygen. In C the BOD had exceeded the system’s oxygen supply. One of the most important concepts of aquaculture is BOD. The capacity of the system is governed by the draw down of its oxygen supply by the organisms in it. Those organisms include those supporting fish metabolism.