碩士 / 國立臺灣海洋大學 / 水產養殖學系 / 92 / Abstract
Moray eels are the commercially important fishes in Taiwan. The study of fundamental biology about moray eels is less, and the literature about growth study of moray eels is very scanty. So we selected 3 Gymnothorax species, including fimbriated moray G. fimbriatus (Bennett), yellow-edged moray G. flavimarginatus (Rüppell) and banded moray G. rueppelliae (McClelland) that can be caught from the intertidal zone of Taiwan to study their growth and fundamental biology. After 180 days feeding, G. fimbriatus with 11~20 cm body-length interval got the best growth rate in length (GRL) 119.67 %, the weight gain (WtG) 1610.75 % and the food conversion rate (FCR) 1.65. G. flavimarginatus with 21~30 cm body-length interval got the best GRL 15.81±7.71 % and WtG 106.24±38.86 %. Getting the best FCR 1.81 was 0~10 cm body-length interval. G. rueppelliae with 31~40 cm body-length interval got the best GRL 27.45 % and WtG 379.84 %. Getting the best FCR 2.11 was 11~20 cm body-length interval. After 18 months feeding, G. fimbriatus got the best GRL and WtG was 16.85 % and 62.29 %. G. flavimarginatus got the best GRL and WtG was 65.02 % and 561.35 %. G. rueppelliae got the best GRL and WtG was 57.99 % and 636.96 %. Following the body-length increased, the value of depth at gill opening / total length of the three kinds of morays would increase progressively, and the value of eye diameter / head length of G. flavimarginatus and G. rueppelliae would decrease. The value of snout length / head length of G. flavimarginatus also decrease. Using all specimens estimate for the length-weight relationship of individual species. G. fimbriatus is W=0.0006 TL3.1874. G. flavimarginatus is W=0.0008 TL3.1522. G. rueppelliae is W=0.0003 TL3.3926.
Following the body-length increased, total teeth of G. fimbriatus would increase, especially the outer dentary teeth (Do) conspicuous. The numbers of total teeth of female G. fimbriatus were more than male, but the numbers of inner maxillary teeth (Mi) of male were more than female. Mi and vomerine teeth (V) of the large-sized G. flavimarginatus were less than small-sized, and Mi of male was also less than female. Following the body-length increased, the intermaxillary teeth (IM), Mi and total teeth of upper jaw (TUj) of G. rueppelliae would decrease progressively, and the Do and total lower jaw (TLj) would increase. Only the Mi of female of banded moray was less than male.
About reproductive results, total lengths (TL) and weight (W) of male were G. fimbriatus 32.15±2.19 cm and 44.85±0.95 g, female were 69.75±9.12 cm and 537.05±205.27 g. TL and W of male G. flavimarginatus were 47.2±13.72 cm and 203.11±197.69 g, female was 37.1 cm and 51.11 g. TL and W of male G. rueppelliae were 55.12±10.61 cm and 276.70±215.83 g, female were 51.89±5.54 cm and 159.51±60.54 g. Female G. fimbriatus bred the mature ovary, the fecundity were 40261±6018 and the diameter of ovum were 1.55±0.24 mm. In this study, the gonads of three Gymnothorax morays didn’t bear bisexual histological characters. So that results tend to support the 3 species were gonochoristic type of reproduction.
| Identifer | oai:union.ndltd.org:TW/092NTOU5086023 |
| Date | January 2004 |
| Creators | Yen-Jay Tseng, 曾彥傑 |
| Contributors | Hong-Ming Chen, 陳鴻鳴 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 101 |
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