When eggs of Oncorhynchus masou masou being in the period of eyes forming,innoduced them from Japan,and breed them to be in the sexual autumn.Gathering eggs and sperms by pressing the abdomen of parent fish,artificial fertilization with the method of injecting the spermatic fluid directly into the eggs.After 30-60mins,they would stop absorbing the water and inflated,then put fertilized eggs into the incubator which in the stream.The survival (in the period of eyes forming)rate is 25.2% (eggs);deformity rate of fry is 5.1%; Disease rate is 7.3% (with white points on the umbilical capsule);and the fries developed normally.But after artificial fertilization in 3mins before absorbing,put eggs into the bartel incubator directly,the survival rare is 59.4%;fries show no sign of abnormality and the deformity rate is 3.6%.The experimental group which water temperature is 12.℃,the survival rate is 95.1%,the incubation rate is 94.0%,and the fries are in good situation.

In the experiment of artificial eggs collection and insemination of Oncorhynchus masou masou,and Salielinus pluvius,1%edible salt solution can replace the isotonic liquor to wash eggs for fertilization.the su rvival rate is h igher 3.7～8.2% than the comparative group.This show when gathering eggs,the 1% salt solution ca n instead of the traditional way-using isotonic liquor,which need a complex method to make

The biology characteristic of female mature fish Salmo gairdneri Richardson、Oncorhynchus mykiss and content of four polyunsaturated fatty acid (PUFA) in its spawn were analysed and studied.The result showed that autumn、brood amount and spawn weight of the two female mature fish was about colse;Four fatty acid valae(mg/g fresh) were linoleic acid＞DHA＞EPA＞linolenic acid,content of two trout-bulltrout spawn had good linera correlation (R≈0.97)。 Total PFA of four polyunsaturated fatty acid、EFA、linolenic、linoleic acid、DHA content and eyed egg valae of ist spawn of the rainbow trout were significantly high compare with Oncorhynchus mykiss.

The species,distribution,classify,resources present status and protective utilization measures were studied in foreign countries and China in present paper,and measures and suggestions about how to protect and use fishes resources of the genus Salvelinus were made in China.

We reported north cold zone to use small size pellet food culture Aristichthys nobilis Richardson fingerling at 5.6 mu in Pond,culturing 131 day,total yield fingerling is 2433kg,average output per mu is 434.5 kg,therein Aristichthys nobilis Richardson output per mu is 305 kg,account for total Yield of 70.2%，average fish body weight is 76.25g,survival rate 80%.

The eggs and fries from grass carps and common carps were treated with different concentrations chromium in water body.It was found that toxic effects was caused at the concentration of more than 2mg/L groups treated with Cr.The fries lethal rate of 10 mg Cr/L groups reached to 30% during 168h.The eggs hatching rate of grass carps and common carps descended 46% and 88.9% respectively.The fries lethal rate of grass carps in 15 mg Cr/L group was 100% and the eggs hatching rate was zero.The endurance to chromium of two kinds of fish has no significantly.

To transplant Coregonus peled (the fishs body length about 10mm)from Russia to lake Sailimu in May and Jun 1998.It observed about 510d.The fishs body weight was average 540g and the largest was 820g.The fishs sex mature amount of male was 96.1% and the female was 18^1% This paper is to narrate biology of the fishs growth.

In this research report,by determining the concentration of the K＋、Na＋、Ca2＋、Mg2＋、Cl-、PO3－4 and etc in Common carp blood,we just preliminarily study into how low pH level affects the balance of electrolyte in common carp blood under water circumstances.The results show that when common carps are in the condition of low pH circumstances,the balance of electrolyte in serum is affected.In the experiments,the conrt of K＋ was evidently higher than the normal level;the content of Na＋ was evidently lower than the normal level.But there was no evident law of the changes of Ca2＋，Mg2＋,Cl－，PO3－4 etc,that were caused by low pH level.

In this paper the effects of the physiological and biochemicail response with low pH on Common Carp were analyzed.The Results showed that when common carps are in the Condition of low pH,the contents of blood K＋ was evidently higher than the normal level,the Contents of Na＋was evidently lover than the normal level.When pH is 4.5-5.0,the contents of plasma glucose was evidently high and body Weight Was weakened Swiftly.when PH was 4.5-6.0,with the Concentration rising,the activation of Na＋-K＋-ATPase in gill filament was weakened evidently and inhibited(p＜0.01),and the percent of being inhibited was 50%.when pH was 6.0,with aluminium added (0.5mg/mlAl3＋),the percent of being inhibited was 75%;pH was 4.0-5.5,the percent of being inhibited was 100%.

we researched the water chemistry,plankton and fishes of the ovulation space of salmon in the middle and low section of Huma river from sept.24,1999 to sept.28.

This paper is about the growth of Aristichthys nobilis and Hypophthalmichthys molitrix on the basis of Einar Lea in Nihe reservoir.The Fulton coefficients were WH=0.4133L2.2011，WA＝0.02395L2.9444.The growth equations were LH＝126.87〔1－e－0.0963（t+1566)〕，WH＝46021〔1－e－0.0989（t－0.1293）〕3，LA＝149.36〔1－e－0.0912(t+0.2355)〕，WA＝96530〔1－e－0.0792(t－0.2532)〕3.

By means of horizontal starch gel electrophoresis,eight isozymes (LDH,EST,MDH,IDH,SOD,ME,G-6-PDH,ADH)in muscle,liver,eye,heart of Erythroculter ilishaeformis Bleeker were srudied,The genee expression patterns of evevy isozyme were analyzed.Amony 20 loci screened only I locus(Est-2)of EST was polymorphic.The percentage of polymorphic loci and average heterozygosity of Erythroculter ilishaeformis Bleeker in Xingkai Lake was 0.0500 and 0.0139 respectively.Compared with other bony fishes of Cyprinidae,The genetic variation of Erythroculter ilishaeformis Bleeker in Xingkai Lake at protein level is poor.

By applying photosynthetic bacteria under the ice of overwintering pond,the experiment about the effect on fishes in winter was carried out in Minfu fishery base of Heilongjiang viver Research Institate.By analyzing water quality regulary and commparing the overwintenig Survival rate,the resules showsthat The fluctuattion of dissowed oxygen and the biomass of plandto under the ice of overwintering jpond in witer by applying photosynthetic bacteria is very little,and water quality is also cleaned,physical and chemical factos in overwinterig waters remain steble,which make fishes live through the winter safely.