摘要
通过青蛤稚贝不同放养密度的试验,研究了青蛤稚贝放养密度、生长与底质中硫化物间的相互关系。试验结果显示:(1)底质中的硫化物浓度(Cs)随着青蛤稚贝放养密度的增大而升高,并与稚贝瞬时生长率(IGR)存在显著负相关,IGR=8.22×10-0.484Cs(P<0.05,n=30)。(2)青蛤稚贝的生长明显受到放养密度的制约,在5个实验密度梯度中(分别为:200、400、600、800、1 000个/cm2),以低密度的瞬时生长率最高,随着放养密度的增加,瞬时生长率逐渐下降,死亡率上升。(3)密度因子对青蛤稚贝生长的影响主要通过两种途径产生作用:一是个体之间直接对空间和食物的竞争;二是通过对环境的影响(如底质中的硫化物等)反作用于自身的生长。
Many factors affecting on growth of clam have been studied, however, aquiculture density as a factor on clam growth has not been reported fiequently. This study intends to demonstrate the correlations among farming density, gowth and the concentration of sulfide in the sediment. A growth experiment was carried out at Xin-zhong Sea Products Development Co., Ltd., NanTong. Healthy juvenile clam （ 150- 160μm shell height） were collected from induced breeding on 28th July 2005. The results indicated that （ 1 ） the concentration of sulfide in the sediment was increased with aquiculture density. And Instantaneous Growth Rate （IGR） of juvenile clam showed significant negative correlation with concentration of sulfide in the sediment. IGR： 8.22 × 10^-2- 0.484Cs（ P 〈0.05, n= 30）. （2） In the five density groups, 200,400,600,800, 1 000ind ·cm^-2, the highest instantaneous growth rate（7μm·day^-1） was presented in the lowest density group B, furthermore, with the increase of aquiculmre density, instantaneous growth rate was decreased gradually, meanwhile, mortality accrued rapidly. （3） Density as a factor in aquiculmre affects on growth through two different ways：for one thing, the competition for space and food between clam individuals, for another the effect on environment （for instance the concentration of sulfide and bacteria in sediment） reacts on growth of juvenile clam.
出处
《水产学报》
CAS
CSCD
北大核心
2006年第6期796-800,共5页
Journal of Fisheries of China
基金
国家科技攻关专项(2004BA526B0403):农业部结构调整重大技术研究专项"青蛤工厂化育苗及增养殖技术研究"
关键词
青蛤
养殖密度
底质
硫化物
相关性
Cyclina sinensi
aquiculture density
sediment
sulfide
correlation
作者简介
李长松（1970-），男，江苏滨海人，副研究员，主要从事渔业资源、渔业生态学研究。Tel：021-65684690，E-mail：lichangsong@seatfishery．ac．cn
通讯作者：王慧，Tel：021-65684655，E-mail：wanghui55@163．com
