Study On Metabolic Physiology Of Ranapa Venosa And Ranapa Venosa Late Veliger Larvae Under Different Temperature And Heavy Metal Conditions

Combining the metabolic characteristics of Rapana venosa and the recent environmental pollution situation, this paper started with differences showed between OCRs(or NERs) of Rapana venosa (or Rapana venosa larvae) under different temperatures (or different heavy metal conditions), explored optimum water temperatures for the growth of Rapana venosa and the development of Rapana venosa larvae, hoping it’s helpful for productive practice, also explored tolerances of Rapana venosa and Rapana venosa larvae for different kinds of heavy metal and adaptabilities of recent water pollutions.The results of this study are summarized as follows:1.It got optimum temperature ranges for the growth of Rapana venosa and the development of Rapana venosa larvae. According to this study, the OCR of Rapana venosa raises with the increase of temperature in a certain temperature range between 10℃ to 30℃ and the NER of Rapana venosa raises with the increase of temperature in a certain temperature range between 10℃ to 20℃ and a high temperature over 25℃ can reduce the NER of Rapana venosa. So the optimum temperature range for the growth of Rapana venosa is between 20℃to 25℃. Meanwhile both OCR and NER of Rapana venosa larvae raise in the temperature range between 15℃ to 25℃ which makes the optimum temperature 25℃.2.It measured differences of OCR and NER of Rapana venosa with the change of time under different heavy metal conditions. According to this study, Zn2+did no obvious effect to OCR of Rapana venosa in the experimental concentration range between Oμg/L to 80μg/L. Though,the NER of Rapana venosa raises with the increase of the concentration of heavy metal in concentration range of Zn2+between Oμg/L to 40μg/L and a high concentration can do opposite. Both OCR and NER of Rapana venosa raise with the increase of the concentration of heavy metal in concentration range of Cu2+ between Oμg/L to 20μg/L and a high concentration can reduce both. A concentration≥20μg/L of Pb2+ inhibites the metabolic rate of Rapana venosa.3.It measured differences of OCR and NER of Rapana venosa larvae with the change of time under different heavy metal conditions. According to this study, Zn2+ did no obvious effect to OCR of Rapana venosa larvae in the experimental concentration range. Though in the concentration at 20μg/L of Zn2 +raises the NER of Rapana venosa larvae during the experiment and the concentrations at 40μg/L and 80μg/L raise the NER at first and reduce the NER later. The concentrations at 80μg/L and 20μg/L and 40μg/L of Cu2+ raise the OCR of Rapana venosa larvae increasingly during the early experiment and reduce the OCR of Rapana venosa larvae increasingly later. The concentration at 20μg/L of Cu2+ raises the NER of Rapana venosa larvae and the concentrations at 40μg/L and 80μg/L of Cu2+ reduce the NER of Rapana venosa larvae. In the experimental concentration range of Pb2+, the concentrations between Oμg/L and 40μg/L raises both OCR and NER of Rapana venosa larvae and the concentrations at 80μg/L raises both OCR and NER of Rapana venosa larvae first and reduces them later.