Abstract:Materials in the experiments were prepared by absorbing tb.e extracts of fish food N-Paraffin yeast. They were tested,ar znu enic properties by using the Sal.monallaTyphimurium microsomal test system. Mutagenic activity was detected in the prepared N-Paraffin yeast materials. It re-eals that this fish food may contain the compound of flameshift and base.-pair substitution mutagens. It required metabolic activations. Therefore great care should he taken in using this yeast as the food of fish or other animals in order to av aid the potential harmfulness.

Abstract:This paper deals with the feeding habit of different developmental stages from fry to juvenile of T. rtida.The morphological characteristics of the teeth on both the upper anal lower jaws and of pharyngeal teeth, gill rakes, gut and digesitive glands are observ ed.Bexnatically The niorological changes of the digesitive orgin regard to the variation of the feeding habit is examined, aced also the feeding habit, of T.raiboca during each development stsge and guts contents hat-o bean analysed.

Abstract:Font heavy metals-copper, zinc, lead and cadmium rovers found in.discharged water from the Iead and zino smeltry. These four heavy metals remain a rather high content in the water all the year around. Most of them was deposited in the silt of the riverbed., it is considered to be the potential harmfulness to fish. These heavy metalsmd/Ldually accumulate in plan;tons and then transfer to the fish bodyThe coefficient of accumulaticn zs respectively. The cantent of lead and cadmium in th) fish body is not less than 1.00. The ratio of the eorxtent of the four heavy metals in the body of the deformed fish is Zn:Cu:Pb:Cd=59:1:3:1. The content of cadmium in the deformed fish was eighteen. times higher than that in the controlled group. This shows that the high concentration of cadmium may be the causal factor of the deformation of fish. The egperiruent has proved that the pernicious heavy metals in the waste water disctzarged from the smeltery have toxin effects on fish. ly'hen the water contains 1.4g in volume, the TLM of the oxperinzental fish is 4g. ZGThen the content of zinc is hiaboe 1.5mgjl, fish will dia in acute poisoniizg and the rantent of zinc and cadmium reach to25mg/L a,nd 0.0125mg/L, respectiS-ely, the symptoms of ataxia in swimming, paralysis and deformation will appear. Zinc has a quick topic effect, always cause high mortality. Cadmium has.great effect on deformation. The mised, solution of Zn and Cd hues.combined effect an fish.

Abstract:The process of nuclesr-insertion in pearl oyster includes three stagers: preparation, inserting operation and recuperation. During the preparation stage, the function of molluscs decreases gradually, the action of addueter-shell movement becomes weak and less frequent, the time of shell elossing is extended. The average frequency and the a-erage amplitude of shell opening is about half of the regular ones and shell closing period estends shout 1 to 2 times. These changes are objiously observed. After each experiment mast of pearl oysters are alive in reUperation, sametim the survival rate reaches to lUU.At the same time, izz inserting operation most of the pearl oyster can open their shells by their own, which brings gxeat cane enience to operatiVn. Tn recent years average survival rate reaches to 91,and the death rate in recuperation (one month) reduced to Iower than 15.his erperiment has basically solaced the key terhnical problem of high death rate in recuperation stage.

Abstract:The holostome metacercariae were found in the fresh water fishes of Hyascdeotris swinbonis, macropodus opercularis, pseudorasbora parva and rasborcs saercthus in Guangdong area. These encysted metacercariae have been experimentally fed to ducklin.gs from which adult worms are obtained in the intestine. Two species have been identified, one is.Batemor ccidms described by Yamaguti, 1933 and the other is a new species and the name G'yathocot aense is given. The former requires B days to develop to adult after infeotion while the latter requires 4 days. Histological and histochemical structure of the cyst wall was studied. Eody pyriform, not concave ventrally, 0. T40-0. 996 -805mm. Of al suoker terminal, Anetabulum absent. Pharynx developed, Esophagus not distinct. Caeca extending to posterior extremity of body. Testes diagonal and varying in sire, Genital pore opening to the posterior terminal. of the body. dvary oval anl. anterior to the IePt. testis, Uterus very short, Vitellaria follicles numerous and well developed. Eggs large, 0.096--0.120 by 4.056-O.Ofimm, Definitive host: MaeroPodus oerrzc- dares, Pseacdorasborcc prva, Rrcsbor.us hneatlaus. sacion testine. Locality:Guang zhou, Guangdoxig Pravixice, China..pe specimen: Deposited in the Department of Parasitology Zhongsieal College, Guangahou C. s2raersse sp. nov. is morphologically similar to C. oraaL2s, but they differ from the proporation of the oral sucker and pharynx, position, and sire of the testis, distribution and number of vitelline follicles and the eggs in number. The outer wall of two species belong to areolar connective tisus, as well as theirrhemicr,I compositions, except cantaiuing a Little amount of theglycogen and Lipid, are consisted mainly of carbohydrate-protein complexes including tyrosine, muroprotein, neutral mucopalysaccharide and glycoproteixz. Vhile the inner wall of tava species is。 non cellular structure and belongs to collagenous fibers, its nature o# histoehemistry is sim ilar to that of outer wall except that it lacks oflid rind has less in c.mount of tho remaining elements. As for the origin o# the cyst wall, the outer waIl, similarly to that of the surrounding host tissue, is assumed to he origitzated from the host tissue and the inner wall may be formed from the excretory substances of tha parasite itself.

Abstract:The present paper deals with the zuarphologv of the placoid scales of sharks with particular reference to their patterns. 189 species belong to 62 genera, 21 (amities and 9 orders have been iwestited, of which 80 species~based on Chinese specimens and ID9 species are cfuoted from foreign materials. According to their special characte-. ristics of this paper consists of three parts: 1, the patterns of placoid scales of sharks;the morphological characteristics of placoid scales of sharks in different tags of classification;3. discussion and conclusion,

Abstract:A relatively small quantity of scallop spats (ChLamys farrer) were obtained frnm the coastal waters of Lhimao Wan of uiahaxxg .ian in 1978. Since 1979 a series of surves were carried out to investigate the distribution of larvae and the potentiality of this species in order to estimate the value of egoitation of the bay. Tha results indicata that this region is situated at the autrshelf of the ooast,the variation of current condition makes the settlement of the spat to be unstable and also the shape of the bay is shallow and open. It is not valuable to exploit far commercial mariculture ground.

Abstract:海洋增殖渔业(Marine Propagated Fisheries),在日本称为栽培渔业(Cultivating Fisheries),在其他国家又称为海洋牧业(Marine Ranching)。我们考虑到“栽培渔业”和“海洋牧业”这两个概念在我国都不能反映这种渔业的特点,因此使用海洋增殖渔业这一名称。

Abstract:This paper embodies the results of hydrochemical survey and tha estimations of phytoplanktoz production in eight high-yield fish ponds of Helie commume Wuxi from May to August 19TT. Three ponds of Wuxi Hu fish farm are also studied for comparison. The high-yield ponds have moderate main ions in content, with a ovnstant pH value The effective nitrogen of the water averaged 1.24mg jI, among which NH₄---N 61%，11TDa N i8 o and NO₂-N 24%. The soluble reactive phosphorus is 0.028 mg/L. COD_mn is 13.3mg/L. Owing to the high N/P value (61--139)，the phosphorus should be the limiting factor of the promary productivity.