泥蚶及菲律宾蛤仔对环境中氨的耐受力

TOLERANCE OF THE BLOOD COCKLE (ANADARA GRANOSA L.) AND PHILLIPPINE CLAM (RUDITAPES PHILLIPPINARUM ADAMS ET REEVE TO AMMONIA IN SEDIMENTS

本文对泥蚶成贝、幼贝,菲律宾蛤仔成贝、幼贝的未离解氨氮 168h LCD_(50),EC_(50)(降低耐低氧环境能力50%的浓度)进行了试验,并对氨的致死和亚致死浓度与内湾养虾水域(乳山东湾)、试验虾池及利用虾池水的试验贝池底质环境的氨氮水平作了概略评价。

The 168-h LC50 values of un-ionized ammonia (NH3-N) was tested to be 5.40, 1.80, 0.65, 0.64mg/L and the EC50 (concentration causing 50 percent reduction in tolerance of hypoxia) values was 0.44, 0.23, 0.24, 0.12 mg/L for juvenile and adult of the blood cockle and clam respectively.These concentrations were evaluated probably with the ammonia level in sediment environments in gulf waters for prawn culture (Rushan Eastbay), prawn culture ponds and shellfish culture ponds which make use of prawn culture pond water.