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|Issue Date: ||2017-11-21T08:09:50Z
Artificial propagation of the grey mullet (Mugil cephalus Linnaeus) was successfully accomplished after seven years of experimental work conducted in the winter. In the course of these experiments, mature spawners were obtained from fishing boats at sea, which usaually suffered injury while being captured. Wearher condition increased the difficulties of obtaining mature spawners. In order to overcome these difficulties and to establish a more reliable source of mature spawners, work on induced breeding of pond-reared mullet was started.
A three-year old spawner measuring 41.5 cm in standard length and 1.2 kg in weight (post-ovulation measurement) from a freshwater pond was used in this experiment. Before hormone treatment, the spawner was reared in a freshwater concrete pond, with sea water gradually added, and the fish was fed with artificial feedstuff. Hormone treatment was the same as for those spawners obtained from the sea. After three injections, the eggs were discharged and fertilized with milt stripped from mature sea mullet. The fertilized eggs hatched well. The rearing of larvae was carried out in 1.0 and 0.5 ton round plastic tanks.
Laevae from pond-reared spawner were found to be easier to rear than those of spawners obtained from the sea. By February 22, 717 larvae had survived for 35 days with a standard length of 2.32 cm. The survival rate was 1.48%.
Although the result obtained was only that of one spawner, it had proved that pond-reared mullet could be used as spawner in artificial propagation and that the difficulty of obtaining mature spawners could be overcome to a large extent.
|Relation: ||11, pp.30-35|
|Appears in Collections:||[廖一久院士專區] 叢書|
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