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Australian Fish Farmer: A Practical Guide to Aquaculture, by John Mosig, Ric Fallu

By John Mosig, Ric Fallu

A pragmatic advisor that covers vital points of aquaculture together with food, breeding, fish overall healthiness, harvesting and advertising.

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Extra resources for Australian Fish Farmer: A Practical Guide to Aquaculture, Second Edition (Landlinks Press)

Sample text

Yabbies, especially under the multiple waters licencing arrangement that apply in some states, can be held and fed in captivity until they moult. The old stained shell is discarded and replaced with a clean new shell lifting its market appeal dramatically. Probably the most well-known seafood feedlotting operation is with tuna at South Australia’s remote Port Lincoln. Here bluefin tuna caught in the wild are held in sea 2 – Aquaculture production systems 19 cages, for all intents identical to the cages described earlier.

It forms an important habitat for the microbes. The bacteria that convert the potentially dangerous ammonia to relatively safe nitrate are also part of this group. Microbes also make up the nutrient source of many crustaceans. 6 – Wa ter quality 43 Invertebrates Invertebrates consist of the aquatic insects and their larvae that inhabit the pond. Although often not regarded as plankton, they are part of the biota that makes up the plankton. Plankton deaths Plankton deaths are not uncommon. When plankton die in large numbers, the resulting changes may be contributing factors causing a water quality collapse.

Cause and effect can have a complex connection and understanding these relationships, as well as being able to manage them, is the role of the pond manager. The influence of photosynthesis on water quality Photosynthesis This is the formation of organic substances in plants. These substances are mainly sugars, and are made from carbon dioxide, nitrogen, phosphorus and trace elements. 42 Australian Fish Farmer The energy of the sun is the driving force of photosynthesis. The most prolific plant form found in productive fish ponds is phytoplankton.

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