| 英文摘要 |
Generalizing from the references, the investigated items which should be carried out before setting artificial reefs include that (1) The hydrological factors of sea water, (2) Diversity and grouping of fish, (3) The varieties of catch. Items which must be investigated after setting reefs including that (1) Characters of reefs distribution, (2) Diversity and grouping of fish, (3) The varieties of catch, and (4) The benefit of leisure.
The diversities of fish were similar among three types of reef, including warship reef, steel reef, and concrete reef, in the waters off Schen, I-Lan County. Mass of corals flourishes in steel reef and warship reef. Most of Apogon kinesis and Chromis flavomaculata occupy in inner and ambit part of reefs. There also habited with Parapristipoma trilineatum、Seriola dumerili and Caranx ignobilis around the reefs. While, lobster, grouper and rock-fish stayed in the interspaces between reef and bottom. The composition of sea-bottom in the second artificial-reef region of Fan-Liao was silt and fine sand. It will lead the reef to be buried or sunk much more easily in the bottom. The efficiency of attraction for fish in the second artificial-reef region was higher than it in the first artificial-reef region of Fan-Liao.
The mean IPUE (income per unit effort) was up to NT$ 6,531 per day in natural reef, NT$ 4,859 per day in concrete reef, NT$ 4,430 per day in steel reef and NT$ 3,721 per day in boat reef in the waters off I-Lan County. On the other hand, the mean IPUE was up to NT$ 3,192 per day in the first region of artificial reef (AR), NT$ 4376 per day in the second region of AR, NT$ 1,759 per day in the third region of AR, and NT$ 1,362 per day in natural reef.
Results showed that 76.58% of visited people diving for sight seeing in the water, 46.56% of visited people for training, and 27.00% of visited people for photo. Most of visited people (87.85%) had dived in the coral reef, 28.18% had dived in the concrete reef and 19.34% had dived in the warship reef. |