碩士 / 國立中山大學 / 海洋資源學系 / 85 / The purpose of this study is to define a key to identify the larvae and juveniles of Liza species by means of the external characteristics and the seasonal appearance at three coastal wasters, Putai harbor, Kaohsiung harbor, and Dapong Bay, in the southwestern Taiwan.
Monthly sampling conducted from December 1995 to December 1996 at three sites. Fish samples were collected by pond net with lighting at the ebb tide in the evening. Subsamples of field samples as well as of the laboratory-reared larvae were obtained at a 10 to 15-day interval in order to examine the changes of external characteristics, i.e. distribution patterns ofmelanophore, the ratios of the head width and total length, body height and total length, and head length and total length, the relative position of the unpaired fins, number of fin rays, shape of caudal fin, teeth in the both lips. Moreover, the morphologically identified samples were further defined by electrophoresis.
Five species of Liza larvae, namely L. affinis, L. macrolepis, L. subviridis, L. vaigiensis and L. haematochila, were identified. The larvae (total length smaller than 3 cm) were identified mainly by the pattern of melanophore at the body frank and the dorsal side from occipital region to the base of 1st dorsal fin. Whereas the juveniles (total length larger than 3 cm) were identical by the key for the adults. The identification key based on the external features were also verified by the electrophoresis.
The ecological distribution of the Liza spcies were significantly different at the three sites. L. affinis, L. macrolepis, and L. subviridis occurred among the three sampling sites. However, L. affinis dominated at Putai harbor, whereas L. marcrolepis dominated at both Kaohsiung harbor and Dapong Bay. L. vaigiensis and L. haematocheila appeared only at Dapong Bay and Putai harbor, respectively.
The spawning seasons of each Liza species were estimated by means of the monthly frequency distribution of total length. The results showed that L. subviridis spawned all year round; L. affinis and L. macrolepis spawned from mid-November to May and November to April, respectively; L. vaigiensis was Mar-May spawner; L. haematocheila was unidentified due to the shortage of samples.
| Identifer | oai:union.ndltd.org:TW/085NSYS3277009 |
| Date | January 1997 |
| Creators | 蘇德強 |
| Contributors | 陳孟仙 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 90 |
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