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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/44311

Title: 淡水魚塭烏魚人工繁殖試驗初步報告
Authors: 廖一久;李棟樑;林美雲;羅明川
Date: 1971
Issue Date: 2017-11-21T08:09:50Z
Publisher: 農復會漁業叢書
Abstract: Abstract:
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.

1.供試之烏魚,約3年大,體長41.5cm,體重1.2kg(產卵後予以秤量),GSI為25左右。賀爾蒙處理前約3個月移自淡水魚塭,漸漸加入海水,並投以富於營養之混合飼料,結果體肥且健,成熟情形不遜於天然洄游至東港附近沿海之種魚。
2.前後予以3次賀爾蒙處理,共使用6個烏魚腦下腺,混合40個家兔單位生殖腺刺激賀爾蒙(Synahorin),另加150mg維他命E,結果首次處理後51小時又15分即排卵。
3.卵徑0.90~0.96mm,油球約0.38mm,與採自天然種魚之卵並無差異。
4.受精卵在鹽分濃度28.6~29.4‰,水溫23.0~23.9℃之下,37小時又45分即孵化。
5.剛孵化出之幼魚全長約 2.7mm,體色較白,但活力甚強,在逐漸淡化之飼育水中培育,孵出後第35天,體長已達2.32cm,共存活717尾魚苗,活存率為1.48%。
6.此次雖因情況所限,供試魚僅有一尾,然而足可證實魚塭確可育成種魚以供人工繁殖。
Relation: 11, pp.30-35
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/44311
Appears in Collections:[廖一久院士專區] 叢書

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