Comparison in nutritional quality between wild and cultured cuttlefish Sepia pharaonis

In this study, the proximate composition and the amino and fatty acid profi les of shrimp Litopenaeus vannamei(prey) and wild and cultured cuttlefi sh Sepia pharaonis(the latter fed the prey) were determined and compared with FAO/WHO recommendations. The resulting scores for isoleucine, phenylalanine+tyrosine, histidine, lysine, threonine, and tryptophan in cultured cuttlefi sh were ≥150. The ratio of EAA(essential amino acids)/nonessential amino acids in cultured cuttlefi sh(0.82) was higher than in the wild form(0.80). All EAA amino acid scores for cultured cuttlefi sh were higher than their wild counterparts, except for histidine and tryptophan. Both groups of cuttlefi sh possessed similar saturated fatty acid content, with the cultured containing much more total(Σ) monounsaturated fatty acids, Σ n-6 polyunsaturated fatty acids(PUFA), and eicosapentaenoic acid(C20:5 n-3) but less Σ n-3 PUFA, arachidonic acid(C20:4 n-6), and docosahexaenoic acid(C22:6 n-3) than their wild counterparts. Therefore, the present results suggest that these cultured cuttlefi sh were better than the wild form for human health. Notably, these results also indicate that the nutritional composition of these cuttlefi sh might have been signifi cantly affected by diet.     

凡纳滨对虾高位池养殖系统的水质理化状况

对凡纳滨对虾高位养殖池水质环境状况进行了研究。结果表明，养殖期间虾池水体透明度前期较高，中后期较低；虾池pH变化在7．89-9．02之间，变化幅度较小。虾池水体悬浮物数量和CODMn随养殖时间延长而持续升高，变化范围分别为18．5—162．3mCL和3．52-14．58mg／L。虾池水体中营养盐各月份波动较大。无机氮的数量变化在0．206—1．621mg/L之间，含量逐渐升高，磷酸盐数量变化在0．009-0．067mg／L之间，含量逐渐下降。水环境中N、P比较高，平均为62．7。养殖水体中后期处于严重富营养化状态。     

南美白对虾消化系统的组织学和组织化学研究

利用光镜对南美白对虾(Penaeus vannamei)消化系统进行组织学和组织化学研究。结果表明：消化系统由消化道和肝胰腺组成。食道肌层最发达,肌肉中富含蛋白质和脂类;胃内几丁质特化成胃磨和腺滤器;中肠上皮细胞游离面具发达的微绒毛,前、后盲囊上皮细胞有柱状和杯状两种形态;食道和后肠中分布有大量粘液腺。肝胰腺由发达的肝小管组成,肝小管管壁细胞有4种类型,即：R—细胞、B—细胞、F—细胞和E—细胞。还初步探讨了消化系统组织结构与功能的关系。     

微生态制剂在沿黄低洼盐碱地凡纳滨对虾养殖中的应用研究

研究了微生态制剂在沿黄低洼盐碱地凡纳滨对虾(Litopenaeus vannamei)养殖中的应用效果。实验表明，微生态制剂对盐碱地养殖水环境有明显的净化作用，能有效降低水环境中的氨氮、化学耗氧量和碱度，提高对虾的养殖产量。其中施加BZT活性水质净化剂实验组对虾养殖存活率、纯利润和产出投入比分别比对照组提高14．5％，84．9％和57．5％。     

海藻在南美白对虾饲料中的应用研究

在以鱼粉、豆粕等为主要蛋白源的实用饲料中添加不同含量的海藻粉（0％，3％，6％，9％和12％），喂养体质量为0.40-0.61g的南症状白对虾幼虾30d。结果表明，饲料中添加3％组的南症状白对虾体增重和蛋白质效率显高于其它各添加组，而未添加海藻粉组生长最差；添加3％海藻组饲料系数最低，而未添加组和添加9％和12％组最高；对对虾体成分的分析显示不同含量的海藻粉显影响对虾体灰分、脂肪和总糖的含量。