Abstract:
The primary production in relation to green mussel was investigated for 8 months during January to August 2006 in two types of culture methods, the long-line and the raft, at Si Racha District, Chonburi Province. The everage primary production of the long-line and the raft were 1.49±0.79 and 0.99±0.76 gC/m³/d, respectively. In August, when the experiment was terminated, the everage of shell length was 76.61±5.55 and 72.39±4.51 millimeters, total weight was 20.05±2.55 and 15.61±2.88 grams and soft tissue weight was 10.76±1.47 and 8.32±1.93 grams in long-line and raft culture, respectively. The everage of total weight and soft tissue weight of the mussels in the long-line have been found significantly higher than those in the raft. (P<0.05) This finding was consistent with the high primary production, C:N ratio of suspended solid and total phytoplankton that found in the long-line. This results impiled that the more food in the long-line will support growth and increased weigh of mussel. In long-line, only chlorophyll a has a positive correlation with primary production, while transparency has a negative relationship. The primary production in the raft has the positive relationship with dissolved, C/N ratio of suspended solid and particulate organic carbon.
The gradually decreasing of salinity from June to August, was not influenced on the primary production but effect on the phytoplankton succession. The dominant diatom, Chaetoceros spp., were place by dinoflagellates and other phytoplankton.