Various kinds Gill net Used in Indonesia

1. Based on the arrest / positions in the waters Gill net
a. Surface Gill net or floating Gill net (surface Gill net)
Gill net type is installed or operated in surface waters. At one end of the nets or on both ends tied to the anchor rope, so that the location (position) specified by the location of the nets into the anchor. Some combined into one piece, and the number of piece must be adapted to the circumstances fishing ground. Float line (rope floats, rope almost above) are on the water surface (surface). Thus, the direction of the range with the current direction, wind and so forth can be seen.
b. Mid water Gill net (Gill net mid)
Gill net type was operated in the mid-waters (between the surface and bottom waters).
c. Bottom Gill net (Gillnet basic)
Bottom Gill net operated in bottom waters. At both ends of the anchor tied nets, so the location of the nets will be given. At the bottom gill net, extended nets near the bottom of the sea. The types of fish which it has been catching fish is the base (bottom fish) or demersal fishes. Net position can be estimated on the float-flagged / marked placed on both sides end the net, but it can not be known whether the bad stretch of the net itself. Operating together with surface gill net arrest. The difference is only the net position in the water.
In general, the area to gill net fishing ground is an area of ​​beaches, bays, estuaries that lead to all kinds of fish caught can be various types.
The types of shrimp, lobster also the arrest of these nets. Klitik nets or Lapdu nets is one type of bottom Gill net.

2. Based on the method of operation / arrest
a. Fixed (sets) Gill net
These gill nets are settled on the surface, base, or at a certain height on it by using ballast or anchor which can balance the buoyancy buoy.
b. Drift Gillnet (Gillnet float)
Drift Gill net often also called a drift net, drift Gill net salmon, salmon drift trammel net, or drift nets. This net position is determined by the anchor, but drifted to move freely follow the direction of current movement. On the one hand from the edge nets laid rope, and rope is connected with the ship, drifting movement of the ship more or less also can affect the net position. Apart from the forces currents, waves, the wind strength will also affect the state of drift nets.

Drift Gill net can be used to pursue the hordes of fish, and is an important tool for capturing high seas fisheries. Because of its position is not determined by the anchor, then the influence of flow speed on the net body force can be neglected. Net movement in conjunction with the flow of movement so that the prisoners of the net against the current can be ignored.

The fish that became the purpose of arrest, among others, saury, sardine, mackerel, flying fish, skipjack, tuna, salmon, herring, and others.
c. Surrounding Gill net (Gill net circumference)
Hordes of fish circled the net. In order to fish gang circled / captured perfectly, then the form of net operating when there is a circle, half circle, a V or U shape, like a twisted groove band and many other types.

Fish after netting surrounded in a circle, made ​​surprise, so the fish will be caught in the mesh. Sometimes on the inside of the circle stretched too few a few pieces of netting, so the possibility of fish that has ensnared all cooped up will be faster. High net cultivated according to the depth of the waters. Sinker line should touch the bottom waters.

This fishing gear used by fishermen to catch fish that live in reef waters that is by installing fishing gear around or encircling reefs, and then carried out the expulsion of the fish by spraying water. Fish that panic is expected to be caught by the nets.
3. Under construction
a. Ordinary Gill net
Gill nets are nets body consists of only one layer.

b. Gill net tier two
Gill net type is a modification of two Gill net where 2 nets are operated together. The purpose of arrest is a type of shrimp.

c. Trammel net (Gill net plated three)
Trammel net is one kind of bottom Gill net advanced and specialized to catch shrimp. Trammel net is a gill net consisting of three layers of netting. One layer of the inside (inner set), and two outer layers (outer set). Mesh size nets lining the inside of the mesh size is smaller than the outer layer. Operation can be done anytime, but in certain seasons is very prominent tool for catching shrimp. The principle of operation vary according to the condition of waters. Can be installed settled and straight stretches against the current, or set the net straight stretches and then withdrawn by forming a circle with a net haul road.
4. Based on the type of fish caught
a. Nets song, this type of fishing song Gillnet sardinella (Pelabuhan Ratu in West Java, Indonesia)
b. Loang nets, catch fish, pomfret Formio niger (in Cirebon, West Java, Indonesia)
c. Shrimp nets
d. Etc.
5. According to the material / yarn nets
a. Monofillament Gillnet
b. Multifilament Gillnet

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Eye Ablation in Spawning Shrimp

Eye ablation was one of much Shrimp spawning technique that found at eighties. although it looks like a tortured parent shrimp but the technique is considered the best at that time.purpose of this eye ablation to decide the path ecdysteroid hormones that regulate molting and regeneration in the prawn. ecdysteroid hormone is synthesized in organs neuropeptide y on setting eyes on stalks. eye ablation is usually done by cutting the shrimp eye stalks will stimulate ecdysteroid secretion of hormones so that an accelerated molt cycle.
Activities eye ablation done on hard-skinned female shrimp are not new or at moulting condition. For new shrimp will experience stress if performed ablation.
Eye ablation can be done in various ways, either by cutting the stalk eyes and it could also divide the eye and remove the shrimp eyeballs, but ablation of the eye that is often done is by splitting the eye by using a razor blade tool and then removed his eyeballs right eye over which the female is held by way of folding the tail towards the stomach slowly so that the parent is not able to wriggle again when ablation is done after splitting the eyes and the scar was clean with a solution of treflan. This is done to prevent infection of the wound and then soaked in a solution of potassium permanganate (KMnO) 1-2 ppm for one minute. After it is inserted into the female parent spawning tanks and united with the male parent. The success of ablation process of the eye characterized by swimming towards the front or the female parent to move forward after put into water.

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10 STEPS FOR POND PREPARATION

10 STEPS FOR POND PREPARATION

Reducing Risks of Aquatic Animal Disease Outbreaks

1. The pond has to be wet to check if the pond bottom is dirty. If your pond is dry get your pond bottom wet for at least 3 days. If your pond is full, drain it almost completely
2. Check if the soil is black or smells bad. If the soil is black or smells it means that the pond bottom is dirty
3. Remove as much as possible the black soil especially from where you feed the shrimp. If you use a nursery, make it deeper than the rest of the pond because deeper water is better for post larvae. The soil you remove is waste,put it outside the pond, not on the dike
4. If the soil is acid or if the pond bottom or the water is orange, wash the pond 2-3 times to remove some of the acidity. Ploughing a pond with acid soil increases the acidity of the soil. Therefore ponds with acid soil should not be ploughed, only washed, kept wet, and then continue from step 7.

5. If you cannot remove all the black soil, remove the bottom algae first then plough the pond bottom when wet or get the pond bottom wet for at least 3 days after ploughing. Ploughing wet soil allows the black soil to become brown and clean

6. Dry for 1 week and check if the pond bottom still has black soil. If yes, get the pond wet and plough again until the black color is almost all gone (see picture below).

7. Get the pond bottom wet before you apply lime so that the lime works better. Consult with an extension worker to decide the dosage and the kind of lime to apply. If you already know the soil pH, follow the table below but do not use only CaO, a mixture is better.

Soil pH Kg CaCO3 per ha Kg CaO per ha

> 6 1000 500

5 to 6 2000 1000

< style=""> 3000 1500

8. Soon after liming, put at least 2 layers of fine nets in the inlet and fill the pond with at least 1 meter of water. Using a net will help to keep out of the pond animals that can carry diseases, that eat your shrimp or the feed.

9. Ten to fifteen days before stocking fertilize the pond to produce algae (the green or brown color) and a better environment for the postlarvae. Fertilizers with high phosphate
content produce a good color more easily. Put the fertilizer into a bucket, mix with water
until dissolved and add to the pond. You can use 30-50 kg/ha of superphosphate or NPK
(5:10:3). If you do not get a good color after 3 days add 2-3 kg/ha of fertilizer and wait for another 2-3 days. Repeat adding 2-3 kg/ha more fertilizer every 2-3 days until you get a good color.

10. When the color of the water is green or brown the pond is ready for stocking

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About ULTRA ISO

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