QUALITY IMPROVEMENT OF DISQUALIFIED TIGER PRAWN (Penaeus monodon Fab.) BROODSTOCK USING DOPAMINE
AbstractDisqualifiedÂ tiger prawn broodstockÂ is the one that has undergone ablation after two breeding periodes, which causes high production cost, pollution of environmentÂ and difficulties inÂ providing it continuouslyÂ with enough quantity at exact time.Â The purpose of thisÂ study is to findÂ the proper dosage of dopamineÂ which will giveÂ good qualityÂ forÂ breeding of the disqualified tiger prawn,Â becauseÂ dopamineÂ inhibitsÂ maturation,Â so it hasÂ enoughÂ time for maturationÂ and can be improvedÂ the eggsÂ quality. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â This experiment used 15 pairs the twice breeding tiger prawn,Â which is taken from PerigiÂ (Central Java).Â The sample were treated withÂ difference dosage of dopamine (dosageÂ 10-9 ,Â Â 10-8,Â 10-7,Â 10-6Â mollÂ andÂ control/injected by aquabidest).Â The parametersÂ were identifiedÂ in thisÂ experimentÂ areÂ durationÂ (days)Â for eggs maturation, fecundity, fertilizing rate,Â hatchingÂ rate,Â Â eggÂ diameterÂ and phototaxis respnnsive of theÂ nauplii. Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â The result of this research are the of the averageÂ of durationÂ for eggsÂ maturationÂ on the broodstockÂ that were injectedÂ dopamine, dosageÂ 10-9 ,Â Â 10-8,Â 10-7,Â 10-6Â mollÂ andÂ control , wereÂ Â 14,Â 12,Â 4,Â 2,Â 5Â days.Â FecundityÂ Â 561.489,Â Â 503.000,Â Â 384.205,Â Â 230.850Â Â andÂ 150.034.Â Â Fertilizing rateÂ 89,8 %,Â Â 82,1 %,Â 56.0 %,Â 46,3Â %,Â Â andÂ 23,2 %.Â Â Â Â Hatching rateÂ Â 79,53%,Â 72,53%,Â Â 47,75%,Â Â 12,27%,Â Â andÂ 36.6% .Â DiameterÂ 0,29;Â 0,29;Â 0,29;Â 0,27;Â andÂ 0,27mm.Â Â The naupliiÂ that hadÂ produced byÂ injected broodstock by dosageÂ 10-9 ,Â Â 10-8,Â 10-7,Â have the positive phototaxis responsiveÂ while dosageÂ Â 10-6Â Â and controlÂ were weak. Â Key words: Disqualified,Â dopamine, dosage, duration. maturation, fecundity, fertilizing, hatching, diameters, naupliiÂ Â
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