Matured fish harvested
Answers
Explanation:
sorry
i didn't understand
11.0 Introduction
1. Farmed fish can be harvested in several ways, either from a pond filled with water, or drained, according to your needs and circumstances.
2. You will have to crop fish without draining the water totally (see Section 11.1):
in ponds that cannot be drained by gravity, unless you are prepared to use a water pump;
whenever you want to make a partial harvest by capturing the largest fish to thin out the stock, increasing living space and availability of natural food for the fish left in the pond;
for monitoring your fish stock regularly, for example checking on their growth and the food conversion efficiency (see Sections 16.1 and 16.2);
for management purposes such as fishing brooders from broodstock ponds for spawning or cropping fish fry from spawning ponds where mature fish are left breeding on a continuous basis;
because of water shortage, when not enough water is available for refilling the pond for a next production cycle.
3. To harvest your fish by draining the water completely, usually you need to have a drainable pond. In such case, all the fish present are removed from it, being harvested either inside the pond or outside. You will learn more about these methods in Sections 11.2 and 11.3.
4. The way to harvest a pond also greatly depends on the kind of fish it should yield.
(a) If it should yield live fish such as juveniles for stocking, brooders for spawning, or table fish to be sold alive:
during harvest, stress to the fish should be reduced to a minimum, and
after harvest, fish should be transferred to good water as soon as possible, for transport and, if necessary, for storage.
(b) If the fish are not to be kept alive, as in the case of most table fish, local marketing considerations become important. Even then, a good harvesting technique will make it easier to produce good quality fish.
5. Here are some general suggestions for improving your results, whatever type of harvesting you carry out.
(a) Start early in the morning when it is cooler and stop before it becomes too hot.
(b) Keep your fish in clean water as much as possible:
avoid walking into the pond more than necessary;
bring in additional clean water from outside the harvested pond;
rinse muddy fish well, before storage.
6. For improved results during a total harvest from a drained pond:
stop feeding your fish two to three days beforehand;
manage your pond for efficient draining by good maintenance of its bottom slope and drainage channels;
remove water slowly and regularly, enabling the fish to follow it towards the outlet where they should concentrate;
at the end, collect fish from the water pools and muddy bottom, if necessary.
11.1 How to harvest fish without total draining
1. You can harvest fish without totally draining a pond in one of two ways:
by treating the pond water with chemicals; or
by using fishing gear.
2. Select the best way according to your needs:
if you need fish alive you will have to use fishing gear;
if the fish do not need to be harvested alive, you may also use chemicals.
3. You have already learned in a previous chapter of this manual (see Section 4.7) how to use certain chemicals to control animal pests in undrained ponds. You may use a similar method to stun your fish. You can easily harvest them as they come up to the water surface, for example using long-handled dip nets. Rinse the fish well in clean water
have a nice day