{"id":12762,"date":"2015-07-04T16:35:12","date_gmt":"2015-07-04T14:35:12","guid":{"rendered":"http:\/\/fishconsult.org\/?p=12762"},"modified":"2015-08-07T21:22:05","modified_gmt":"2015-08-07T19:22:05","slug":"controlled-spawning-of-pike-perch-sander-lucioperca-in-poland","status":"publish","type":"post","link":"https:\/\/fishconsult.org\/?p=12762","title":{"rendered":"Controlled spawning of pike perch, (Sander lucioperca) in Poland"},"content":{"rendered":"

Credit:<\/strong> Roman Aszkie\u0142owicz (Poland)<\/p>\n

Review:<\/strong> Roman Aszkie\u0142owicz and Abdel Rahman El Gamal (Founder of the website)<\/p>\n

\"Pike<\/a> \"Pike<\/a> \"Pike<\/a><\/p>\n

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The hormone used in this given practice is the Human Chorionic Gonadotropin (HCG) using a single injection of 300IU\/kg of female body weight (the dose can go up to 400 IU\/kg). The hormonal application synchronizes the maturation process, and hence enhances the spawning effectiveness.<\/p>\n

As shown in one of the images, the female has been anesthetized prior to stripping using etomidate.<\/p>\n

The relative fecundity in pike perch is 170-230 eggs\/g of body weight. Pike perch eggs are small with a diameter of 0.6-1.0 mm for unhardened eggs increasing to 0.0-1.6 mm for the hardened ones.<\/p>\n

A 10-kg female produces around 2 – 2.2 million eggs which are fertilized by sperm taken from live males as done in this given case.<\/p>\n

In order to remove the adhesiveness prior to incubation, eggs are placed in a tannin solution of 0.5-1.0 g\/l of water for a period of 5 min.<\/p>\n

Fertilized eggs are incubated in standard Weiss jars of a 7-l size furnished with bottom water supply of about 3 l\/min. In fact, water supply is low at the beginning of egg incubation (0.5-1.0 l\/min) while increases as incubation progresses reaching about 4.0 l\/min). A typical 7-l Weiss jar can accommodate around 2 liters of eggs. The incubation period is determined according to the degree-day which is (80-120 \u00b0D) in pike perch and hence the incubation at 20 C as in the present case was 3.5 days ending by a hatchability of about was 90%.<\/p>\n

The broodstock were caught from the wild whereas males reach sexual maturity at 2-3 years, while females require 3-4 years to reach their sexual maturity.<\/p>\n

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Credit: Roman Aszkie\u0142owicz (Poland) Review: Roman Aszkie\u0142owicz and Abdel Rahman El Gamal (Founder of the website)         The hormone used in this given practice is the Human Chorionic Gonadotropin (HCG) using a single injection of 300IU\/kg of female body weight (the dose can go up to 400 IU\/kg). The hormonal application synchronizes … <\/p>\n

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