By John Mosig, Ric Fallu
A realistic consultant that covers vital elements of aquaculture together with meals, breeding, fish health and wellbeing, harvesting and advertising.
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)
Sample text
His efforts put a floor in the market from which the growers benefited. Sadly, irregular supplies of quality stock drove him out of the industry. The moral of this story? Do what you’re best at, or what the resources you have on hand limit you to. Some people regard ‘proper’ aquaculture to involve all the stages mentioned in this chapter, but that’s not so. In fact, unless you have the financial resources and Wisdom of Solomon, it shouldn’t be the case. A fish farmer should concentrate on what he or she does well, and if that involves only one stage, so be it.
We keep coming back to it throughout the book so a good deal of it should stick by the end of the first reading. The important thing is that the symptoms of deteriorating water quality are recognised and the corrective measures are understood. It should be noted that the parameters discussed in this chapter are for freshwater systems only. Biochemistry in brackish or saline waters, although similar in dynamics, responds in a different, and slightly more complex manner. However, as most marine farming is carried out in sea cages or flow-through shore-based systems, the dynamics don’t impact on the production system as dramatically as they do using static pond methods.
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. They include the bacteria that are turning the potentially lethal ammonia into relatively harmless nitrate as well as those breaking down the faeces and other organic solids associated with fish production.