Abstract:Ths interrelationship among nutrients, dissolved oxygen and biomass in the upwelling area is discussed in this paper. It is indicated that total inorganic nitrgen is in negative correlation with dissolved oxygen. Primary production is not Limi-ted by nutrients,and secondary production is possibly limited by low oxygen content.

Abstract:An attempt has been made to compare the growth rate of silver carps from dif-ferent sources.They are, a group of wild silver carp and a group of domesticated silver carp from Changjiang River, and a group of wild silver carp and，group of domesticated silver carp from Zhujiang River. Experiments were parried out in fish rearing ponds, net cages and self-purification round ponds. In each experiment the fish of 4 groups reared were mingled and each group was marked by fin-clipping.The fish were reared from 2 months to lfi months old, the total length were from 12 cm to 39 cm, and the body weight were from 16g to 605g.Results showed that a regular differerence of growth rate existed within the 4 groups of silver carp. fn spite of wild or domesticated, the two groups from Zhujiang·River grew fast in the first year，then slowed down in second year. On the contrary,silver carp from Changjiang River appeared slow in the first year and rapidly pragres-sed in the second year. Consequently。surpassing weight of 28---66 g offer Zhujiang River silver carp was produced. The order of growth rate of the 4, groups were:Changjiang wild silver carp>Zhujiang wild silver carp>Changjiang domestic silver carp>Zhujiang domestic silver carp.

Abstract:This paper presents the observation on the larval development of Portunus trituberculatus under artificial cultivation.Based on the morphological characteristics, the whole process of metamorphosis may be devided into five stages that is, four zoeal stages and one megalopa stage.The number of the feathery setae on the distal potion of the exopodites of the lst and and magillped; the form of the pleopods and the number of the setaes on the caudal concavity may be used as the main features for distinguishing the different zoeal stages.Development from the 1st zoeal stage to the young crab required 15-18 days(the zoeal stage reqired 10-12 day and the megalopa stage required 5-6 days) at the tem-perature 22--25℃ under artifical cultivation.

Abstract:It has long been a difficult task to use old methods to estimate rapidly and synoptically the primary productivity of sea waters. The satellite remote sensing data has been used to analyse the chlorophyll-a content in the Huang Hai and Bo Hai Seas in this paper. It demonstrates tb.at the correlation between the satellite-derived cont-ent and the measured content of the both seas in the same month seems very. close,i. e.，the distribution pattern of chlorophyll-a agree with the accumulated knowledge from the productive practice for many years. Hence, the originally processed--image has been rectified by the geometric deformation, a symbolic chart for interpretating the chiorophyll--a content distribution is obtained. Eased on the above work, the values for primary productivity in the euphotic layer of 23 waters in Huang Hai and Bo Hai Seas are calculated by using the empirical formula. It is obvious that this work should he considered important not only to science, but also in directing the fisheries and mariculture.

Abstract:This paper presents the ultrastrticture of free--living filament cells of Porphayra haitanensis which were observed by scanning and perspective electronic microscope.There were clearly a number of ridges on the outside walls of free-living filament cells and. a pit-connection in the inner wall between two neighbouring cells.In the cytoplasm, there are two types of endoplasmic reticulations: the rough endoplasmic retirulation (RER) and the smooth endoplasmic reticulation(SER). They are distri-buted around tlza nucleus and near the cytoplasm membrane. It can be seen obviously that connected endoplasmic reticulations with the nuclear membrane. The nucleus is not always elliptical in intermittent fission stage but irregular. rI'here are some pores on the nuclear membrane. The thylolkoids, phycobilisomes, romasomes, floridean starch and ribosome were also observed.

Abstract:The carpogonial branches of Solieria robusta consist of three cells and oceasianal-ly four in number, the branches are situated in the oorteg pointing to the centre of the thallus. First, the trichogune of the carpogonium extends toward the medulla,and then bends vutwxrd through the cortex to the thallus surface. From the lateral side of the fertilised carpogonium issues a tube, which extends to connect with the nearby auxiliary cells and transfers the fertiLiaed nucleus of the carpogonium into the augiliary cells for development.The stained auxiliary cell bears a deeply stained nucleus in the centre of it. The auxiliary cell together with these deeply stained inner cortical cells cozuprise the auxi-liary cell complex.The auxiliary cell haring accepted the fertilized nucleus, the inner cortical cells give rise to many protective filan}entary cells at its periphery. At the same tame, the auxiliary poll splits toward the interior o# the thallus, producing an initial gonimohlast cell, from which many gonimoblast are produced further. The auxiliary cell, the gonimoblast base cells and the supporting cells fuse together into a larger fusion cell, In later stages, at the periphery of the fusion cell, a terminal car-posporangia is produced as a result of the splitting of the ganimoblast cell rood among the carposporangias numerous sterile filaments extend outward, connecting the fusion cell and the involucre to form a pratective tissue for the cystocarp. The cystocarp is spherical, buried in the thallus, which opens an ostiole outward.

Abstract:The present paper describes a new subspecies of Caridina denticulata. Specimens were collected from a mUtinta,in stream in the Taiping County of Anhui Province in May 1982.Caridina denticulata anhuiensis, subsp. nov.The rostrum reaches to the first segment of the antennular pedunele;the dorsal border is mostly without tooth arad the lover border bears 1-2 teeth. The antero-lateral angle usually is without pterygostomian spine. Propodite of the third leg of the male is crooked, but the female is not; dactylus is stout and boars frequently 6--7 spinules. The outer uropod bears 16-18 spines.Remarks: The present. new subspecies closely resembles to the type form and all known subspecies, but there are some differences from them as follows: 1 .rostrumis rather short; 2 .the dorsal border of the rostrum is mostly without tooth; 3，the antero-lateral angles usually without .pterygostomian spine; 4.the dactylus of the 3th peraeopod bears less spines; 5. the outer uropod bears more spines.Type locality; Taiping County, Anhiu Province.

Abstract:本文介绍了草鱼、鲢鱼、鳙鱼、鲮鱼冷冻精液人工授精试验。对33尾雌鱼的部份卵子进行了授精。各种鱼的平均受精率和最高受精率(括号内是最高受精率)分别是:草鱼 44.21%(71.79%),鲢鱼32.55%(49.78%),鳙鱼16.55%(46.34%),鲮鱼31.03%(91.13%)。试验用的冷冻精液一般在液氮中保存60—90天,最长保存时间超过700天。试验表明,在液氮中保存一年甚至两年的冷冻精液,受精能力没有受到显著影响。

Abstract:Annual changes of the ovaries of Trichiurus haumela were observed. Specimens were collected monthly from the Dang Hai Sea.From December to February of the neat year, the ovaries of hairtails remains at the stage III and passes through the whole winter. From March to April, the ovary develops into stage IV,meanwhile the Cocytes gradually mature in the ovaries. During spawning season from May to August，all stages of IV，V, VI-III, IV' can be found. In the stage V the oocytes are mainly in phase 5, but also contains the phases 3，2 and 1. After releasing one batch of ovum, the spent ovary is observes to be in stage VI-III; the oocytes are mainly in phase 3 and empty follicles are found，then the ovary develops agian into stage IV'，consequently enters stage V'. If enviro-mental conditions are appropriate another spawn may take place.Evidently the development of ooeytes in the ovary of the fish. is in a successive process and the female seems to be able to spawn twice in one spawning seaosn.The spent ovary undergoes a regressive process from September to November.During the regression of stage IV ovary，at first the oocytes in phase 4 atrophp and absorb subseelUently, then the oocytes in phase 3 degenerate and absorbed. The absor-ption of oocytes in phase 4 was brought about by the phagocytic activity of the follicular cells which have been hypertrophied and penetrated into the oocyte; whilethe absorption of oocytes in phase 3 is fulfiled by the protruding of the inner follicular membrane.In the early stage of ooeytes in phase 3,some nucleolar substance, which is considered to be probably related to the formation of yolk within the oacyte，enters into cytoplasm. In the late stage of vitellogenesis the zone radiate of the oocyte degenerate and vanish. There are two layers of gluey membrane outside the plasm membrane of the matured eggs.

Abstract:Individual vegetative cells of Porphyra yezoensis were obtained by mechanical smashing, The isolated cells were oultured In enriched soawster and developed into new fronds in 20 days. The survial rate was about 33%.In attemping to make use of the tatipotency of the vegetative cells of this alga to meet the ever increasing demand for seedlings in commercial culture.A series of experiments were carried out involving the freezing of the seaweed and keeping it at -20℃ for six months from June till December. Then the fronds were smashed to obtain the isolated vegetative cells, which could grow into normal frond seither in the laboratory or in natural sea waters.Results of the experiments revealed tb.at the survival rats of isolated cells is directly related to the water content of the fronds before freezing. When the water content 50% the survival rate was highest in this experiment.It seems possible by appling this principle produce great amount of seedlings to meet commercial need.