碩士 / 國立嘉義大學 / 水生生物科學系研究所 / 107 / This study focused on the polyculture of the mullet (Mugil cephalus) and the shrimp (Litopenaeus vannamei) within two ways: polyculture experiment and questionnaire. The polyculture experiment analyzes by using different stocking densities between the mullet and the shrimp while questionnaire investigation was conducted in mullet farmers in Chiayi and Tainan to study the economic profits for the different percentage of polyculture for the mullet and the shrimp, and use it as a reference for the strategy of aquaculture management.
The polyculture experiment stock the mullets (one year old; 300-400g ) in three different ponds with densities of 5000 (A pond), 4600( B pond), and 6000(C pond) mullets per hectare, and densities of 2300 thousand shrimps (0.5- 0.8 cm) per hectare. The results showed that the survival rate of the mullets in group A , B and C were 68.02%, 47.21%, and 67.11% while the survival rate of the shrimps in group A, B and C were 10.9%, 4.4%, 0.8% respectively after 180 days. The net profit equals the income (mullet body plus mullet roe plus white shrimp) minus operating costs ( larva plus feed plus electricity plus other expenses). After six months of breeding, the net profit of pond A, B, and C(0.3 hectare) were 175, 33, and 73 thousand dollars respectively. The result showed that the polyculture of 500 mullets per hectare with 2300 thousand shrimps per hectare obtain better economic benefits.
According to the questionnaire, mullet farmers can be roughly categorized into three scales, which are less 1800, 1800 to 3000 and more than 3000 mullets per hectare. Mullet farmers stock the mullets with white shrimps a year as the main breeding mode, the pond with more than 3000 mullets per hectare had the highest income, the average was 930 thousand dollars per hectare (p< 0.05), moreover, within the range of total biomass approval, the stocking amount and the harvest amount are positively correlated. However, the pond with 1800 to 3000 mullets per hectare had the highest net profit and benefit cost ratio, which is 590 thousand dollars per hectare and 1.1.
| Identifer | oai:union.ndltd.org:TW/107NCYU5061002 |
| Date | January 2018 |
| Creators | LIOU,KAI-CHEN, 劉鎧郴 |
| Contributors | Chin, Tzong-Shean, Huang, Cheng-Ting, 秦宗顯, 黃振庭 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 52 |
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