The Research In Physiological Energetics Of Pinctada Fucata Martensii

We determined the indicators including the morphological inditors of the pearl oyster Pinctada fucata martensii, the excretion of faecal and pseudofaecal, water quality, and oxygen consumption with the device of flowing water under simulated natural conditions. By the analysis of these indicators, we were able to compare the bioenergetics changes of P. fucata martensii in different months. Moreover, we used the same method to study the bioenergetics changes of those shells which were under starvation before the experiment. We also studied that the different energy budgets between before and after the typhoon, the different energy budgets between one-aged and two-aged shellfishes.We draw the following conclusions:1. The climate of Hainan is tropical monsoon climate, a year can be divided into two seasons, the rainy season is from May to October, and the dry season is from November to next April. Through the long time experiment, we found that, the SFG (scope for growth) in August is the highest, and SFG in April and July is less than zero during a whole year. The energy expenditure of the fecal, pseudofecals and respiratory is relatively stable except in January April, the alternating dry and rainy seasons, the energy expenditure ratio of fecal, and pseudofecas both changed between25%and35%, and the ratio of OCR in whole energy distribution changed between20%and35%.2. The Shellfish individuals need the treatment of suppression before the nucleus insertion. We learned that, the individual total weight after treatment group significantly higher than the control group both from the same breeding batch. The clearance rate (CR), filtration rate (FR), ingestion rate (IR), RR and ER of the treatment group were all less than the control group. Compared the organic content of the fecal, the treatment group is significantly higher than the control group. The assimilation efficiency (AE) of treatment group is observably less than the control group. And the respiration energy consumption of the treatment group is higher than the control group, and the SFG of the treatment group is less than zero. It means that, as the reason of the less feeding rate and the higher energy consumption, the individuals after suppression treatment could not return to the normal growth rapidly, it takes time rest to recover.3. After the typhoon, the violent flipping of seawater and the rainfall brought by Typhoon made the concentration of particulate matter in the seawater, organic particulate matter concentration and inorganic particles concentration rise rapidly. The increased inorganic salts in seawater, made the plankton and algae increase rapidly. The food ingestion significantly changed after the typhoon. The ingestion indicators just like CR, FR, and IR increased significantly after the typhoon. The indictor RR after the typhoon increased observably, but the indictor ER had no significant difference. After the typhoon, with the quantitative and quality improving, the selection efficiency (SE) was declining, absorption efficiency (AE) rose by big percentages. The vital movements of the shellfishes become exuberant after the typhoon, so the respiration energy consumption is also higher than it before the typhoon. Due to the substantial increase of the ingestion and absorption after the typhoon, even the oxygen consumption increased, the SFG still increased substantially。4. Compared with the one-aged shellfishes, the energy intake of the two-aged shellfishes is higher, and the energy expenditure of the fecal and the OCR is also higher the one-aged shellfishes. The SFG of one-aged shellfishes is higher than the two-aged. So the one-aged shellfishes grow faster than the two-aged.