Effects Of Typhoon On Physiological Energetics Of The Pearl Oyster Pinctada Fucata Martensii Under The Laboratory Conditions

Bivalves' growth will slow down or even stagnates after typhoon. Through the indoor simulation of the two influencing factors of marine environment typhoon, and taking Pinctada fucata martensii as the experimental object, the paper explores the influence of the two factors on physiological energetics of bivalves so as to explain the internal causes of the growth stagnation of bivalve after typhoon. The experiment is divided into two phases:during the processing phase (lasting for 48 hours), the water environment of high sediment concentration and high water flow after typhoon are simulated so as to explore the stress reaction of bivalve under typhoon environment; during the recovery phase (lasting for 4 days), the continuous impact when environment becomes normal after typhoon on bivalves is simulated. The following experimental conclusions are drawn:1. The high sediment concentration caused by typhoon inhibits the clearance rate, filter-feeding rate and oxygen consumption rate of Pinctada fucata martensii. The clearance rate, filter-feeding rate and oxygen consumption rate of Pinctada fucata martensii in the sediment group are significantly lower than those of the control group, but the effect doesn't exert lasting impact, and disappear after environment becomes normal again; in addition, the sediment treatment makes the ammonia discharge rate of Pinctada fucata martensii increase significantly, and such the impact on the environment lasts for 3 days before it gradually disappears after environment becomes normal again;2. The high water flow velocity caused by typhoon inhibits the clearance rate, filter-feeding rate and oxygen consumption rate of Pinctada fucata martensii. The clearance rate, filter-feeding rate of impact group are significantly lower than those of the control group; such impact lasts until the end of the experiment after the environment becomes normal again. Moreover, it has higher inhibition degree than the influence of sediment. High water flow velocity makes the ammonia discharge rate of Pinctada fucata martensii increase significantly, and such the impact on the environment lasts for 1 day before it disappears;3. The impact of high sediment concentration and water flow intensity on the clearance rate, filter-feeding rate, oxygen consumption rate, ammonia discharge rate, choice efficiency and absorption efficiency of Pinctada fucata martensii has no significant interaction;4. By comprehensively considering the influence of two factors, the high sediment concentration and water flow speed caused by typhoon inhibit the ingestion of Pinctada fucata martensii and such inhibition lasts for a period of time after typhoon, reducing its energy intake over a period of time. At the same time, in order to maintain the basic energy demand, Pinctada fucata martensii increases the decomposition function of protein, which results in higher ammonia discharge rate. The two factors may be the main causes of the slow growth of bivalves after typhoon.