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Female biology and early life aspects of the swamp eel (Monopterus albus) |
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| รหัสดีโอไอ | |
| Creator | 1. Thumronk Amornsakun 2. Ponpanom Promkaew 3. Anuar bin Hassan |
| Title | Female biology and early life aspects of the swamp eel (Monopterus albus) |
| Publisher | Research and Development Office, Prince of Songkla University |
| Publication Year | 2561 |
| Journal Title | Songklanakarin Journal of Science and Technology |
| Journal Vol. | 40 |
| Journal No. | 6 |
| Page no. | 1420-1427 |
| Keyword | fecundity, gonadosomatic index (GSI), yolk absorption, mouth development, start of feeding, starvation, larviculture, swamp eel, Monopterus albus |
| URL Website | http://rdo.psu.ac.th/sjstweb/index.php |
| ISSN | 0125-3395 |
| Abstract | The sexual maturity of the female swamp eel (Monopterus albus) was studied by determining its fecundity and gonadosomatic index (GSI). The body weight of a sexually mature female swamp eel was 200-250 g. The eggs were nonadhesive demersal and rounded. The maximum fecundity was in June at 701 ova/fish with a gonadosomatic index (GSI) of 3.09%. The minimum recorded fecundity was 181 ova/fish in October with a GSI of 0.57 %. The average diameter of the eggs was 1,784 ?m. The fish eggs were classified by diameter into seven groups: 250-750 ?m (12.25%) as group 1, 751-1,250 ?m (15.62%) as group 2, 1,251-1,750 ?m (14.76%) as group 3, 1,751-2,250 ?m (31.50%) as group 4, 2,251-2,750 ?m (18.87%) as group 5, 2,751-3,250 ?m (6%) as group 6, and 3,251-3,750 ?m (1%) as group 7. Newly hatched larvae of the swamp eel were produced by the semi-control natural method. Newly hatched larvae had a mean (SD) total length (TL) of 1.76?0.06 cm with a mean (SD) yolk sac volume of 1,279.14?101.50 ?m3 . The yolk sacs were completely absorbed within 174 hours after hatching (hAH) at a water temperature of 28,0-30.5 ?C. All larvae were able to open their mouths at 108 hAH (2.50?0.17 mm TL), with a mean (SD) height measurement of 785.00?30.83 ?m. The digestive tract was straight, and was placed on the yolk sac. The digestive tracts were formed at 116 hAH with a mean (SD) length of 845.00?30.75 ?m. The average number of Moina sp. in the digestive tract at the start of feeding was 0.83 individuals/larva. The larvae died within 1,092 hAH at water temperatures that ranged 27.0-30.5 ?C. It was found that the feeding scheme of the larval swamp eel was as follows: larvae of age 5-15 days (total length 2.81-3.30 cm) consumed Moina sp., but at age 12-15 days (average total length 3.2-3.30 cm) the larvae consumed both Moina sp. and a commercial pellet known as 'power feed'. Larvae more than 16 days old (average total length 3.20 mm) consumed only 'power feed'. |
