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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Korean Journal of Fisheries and Aquatic Sciences
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Journal DOI :
The Korean Society of Fisheries and Aquatic Science
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Volume & Issues
Volume 2, Issue 2 - Dec 1969
Volume 2, Issue 1 - Jun 1969
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The Larval Development of Pagurus lanuginosus do Haan(Crustacea, Anomura) Reared in the Laboratory
HONG Sung Yun ;
Korean Journal of Fisheries and Aquatic Sciences, volume 2, issue 1, 1969, Pages 1~15
A study on the complete zoeal development and the glaucothoe of Pegurus lenuginosus de Haan wvas conducted in the laboratoy. 1) P. lanuginosus had four zoeal stages and a single glaucothoe stage. 2) At mean temporature
and mean salinity
, total duration of the zoeal stages was approximately 31-32 days. 3) The zoeal larvae of P. lanuginosus can be easily distinguished from those of other Pagurus species in having 7+7 telson processes of which number as well as shape is consistent throughout all the zoeal stages. 4) The antennal exopodite bears five pulmose setae, and the endopodite is naked throughout the zoeal stages. 5) The 6th abdominal segment has no mid_dorsal spine on its posterior margin during the 3rd and 4th stages. 6) The basipodites of uropod are naked on the distal margin. 7) Mandibular palp is absent in the 4th stage. 8) Antenna of glaucothoe is long extending far beyond the chelipeds. 9) Ocular scale is absent in the glaucothoe. 10) Glaucothoe has 3+3 telson processes on the distal margin of the telson.
SEASONAL CHANGES IN ABUNDANCE AND COMPOSITION OF DIATOMS IN THE SUYUNG BAY, PUSAN
CHOE Jung Shin ;
Korean Journal of Fisheries and Aquatic Sciences, volume 2, issue 1, 1969, Pages 16~24
The present paper deals with the seasonal changes in abundance and composition of diatoms in the Suyung Bay, Pusan, Korea. This study was carried out from August 1966 through July 1967 As a result of the present study, 123 species of diatoms were Identified. While the highest number of diatoms (2,554,000 cells per liter) was recorded in April of 1967, the lowest number (20,400 cells per liter) appeared in December of 1966. In genera the standing stock of diatoms was high in spring and early fall and was low in late fall and winter. Two genera of the diatoms, Chaetoceros and Skeletonema, occupied a great portion of the diatom population throughout the course of this study. The following genera also appeared abundantly: Asterionella, Eucompia, Leptocylindrus and Nitzschia.
FUNDAMENTAL STUDIES OF THE LOWER PART OF THE NAKTONG RIVER FOR FISHERIES EXPLOITATION (1) The Catch of Fish and the Influence of Drought
KIM In-Bae ;
Korean Journal of Fisheries and Aquatic Sciences, volume 2, issue 1, 1969, Pages 25~32
The estimated annual catch of river fishes in the lower part of the Naktong River was derived from the questionnaire, as a part of the fundamental investigation which was carried out for the development of fisheries In that region during the period of May 1967, to June 1968. The data were submitted by fishermen, and the area covered for the present investigation is shown in Fig.1. The annual catch of the region was estimated to be about 500 tons, excluding the mussel Cerbicula elatior. Prussian carp Carassius carassius was the largest in amount followed by com-mon carp Cyprinus carpio, and then goby Synechogobius hasta, Japanese eel Anguilla japonica, mullet Mugil cephalus, ect. and in that order. Major species of the fishes of this region belong to the carp family Cyprinidae, its species counting 23 from the collection during the observation period, and the total number of species was 40, these belonging to 14 families. But occasional severe drought heavily increase the salt content of the region, and at that time the major catch of fish becomes marine fishes such as Harengula zunasi, Clupanodon Punctatus, etc.
STUDIES ON ENVIRONMENTAL FACTORS IN MARINE BIVALVE CULTURE
LEE Choonkoo ; CHANG Nam Kee ; CHOI Shin Sok ;
Korean Journal of Fisheries and Aquatic Sciences, volume 2, issue 1, 1969, Pages 33~40
1. Physicochemical properties of sea water and soil of Korean tidal flats densely populated with species of Mactra veneriformis, Cyclina sinensis, Meretrix lusoria, and Tapes philippinarum, were investigated in order to find out the index of environmental factors in marine bivalve culture. 2. The turbidity varied with the change in concentrations of organic matter, silicate, and the exchangeable copper in sea water. All of these concentrations in Inchon, Kunsan, and Hansando were higher than those in Yusoo. In the 5 areas investigated the lowest were ditected at Kangnung. 3. The minerals and organic matter content in sea water dia not vary significantly among the different bivalve beds. And it was presumed that the soil texture was one of the most important environmental factors for the density of the bivalves in tidelands. 4. The soil texture index of the different bivalve beds was obtained as follow: 5. There were no significant differences of pH, the exchangeable calcium, and the exchangeable copper contents of bottom soils in the 4 different bivalve beds. As important factors in these areas, it seems that the amount of chemical properties might not affect the distribution of bivalve species. 6. Among the 4 beds the soil organic matter content was highest at the T. philippinarum bed and varied with the total nitrogen content. 7. Among the different bivalve beds, it was significant that the water holding capacity and available phosphorus content were highest at the M. veneriformis bed.
Storage Characteristics of Irradiated Pacific Oysters, Crassostrea gigas
CHUNG Jong Rak ;
Korean Journal of Fisheries and Aquatic Sciences, volume 2, issue 1, 1969, Pages 41~46
A STUDY ON THE FOOD OF THE GOBY, SYNECHOGOBIUS HASTA
PAIK Eui-In ;
Korean Journal of Fisheries and Aquatic Sciences, volume 2, issue 1, 1969, Pages 47~62
A goby, Synechogobius hasta (Temminck et Schlegel) was studied to investigate the food consumed and the biological change of the food organisms, and the fish were sampled from the closed tributary and the lower Part of the Naktong River, near Pusan, during the period from November of 1967 to December of 1968. The fish were sampled from four stations (Fig. 1), the total number of fish being 1,295 and they were grouped and analysed monthly. The content of the alimentary canal was analysed in three categories according to modified Nilsson's method (Dahl 1962) with a slight alteration: 1) The number of each item of stomach contents was counted and the percentage of each item in proportion to the total number of food organisms is indicated by the letter 'N' representing numerical percentage in Table 2. 2) The percentage of fish which contained any items of food organisms in proportion to the total number of fish caught in a given season is indicated by the letter 'O' representing frequency of occurrence. 3) Dominant groups of food items were selected and the percentage of the number of each dominant item in proportion to the number of the food organisms belonging to the dominant groups is indicated by the letter 'D' representing dominance. All food organisms were classified in 50 food item categories and then they were grouped in 13 main groups (Fig. 2-1), and they were further divided into 1) obligatory bottom animals, 2) organic drifts and 3) actively swimming forms; according to the conditions of the animal communities within the habitat. Since the majority of its food was composed of the obligatory bottom animals (
), the fish appeard to be a typical bottom feeder. And the dominant food organisms of the fish is generally determined by the local composition of the benthic fauna within the fish habitat. And their seasonal rhythm occurs among the food organisms in the stomach by the biological interaction. Locality variation in the population of the same food organism occurs due to the difference of food organisms in the habitat of the fish at Seonam and Garak, and at Seongsan and Hadan the condition of the niche for the fish in the both regions seems to be the same since the composition and the seasonal variation of the organisms were the same. The results may be summarized as follows: 1) The goby mainly feed on the animals of bottom fauna, and the food organisms are deter-mined by the food compositions within the habitat. 2) Seasonal variation of the stomach content shows the seasonal rhythm due to the biological variation of the population and their interaction. 3) The goby shows no preference on specific food, and the food is composed of a variety of animals. 4) Major food items of the goby are Polychaeta, Palaemon modestus, Isopoda, Gammaridea, Insecta (nymphs and larvae), Ilyoplax deschampsi, and Paratye compressa. 5) Logitudinal succession oil the population of the food organisms is apparently recognized within the community of Seongsan, Garak and Seonam. 6) The goby begins to descend toward the estuary and sea around April when the water temperature reaches
, and they begin to return to river waters in September.
STUDIES ON THE MORTALITY OF THE YOUNG BIVALVES, MERETRIX LUSORIA (1) Boring Rates of Drills on the Young Bivalve, Meretrix lusoria
LEE Jung Jae ;
Korean Journal of Fisheries and Aquatic Sciences, volume 2, issue 1, 1969, Pages 63~70
1. This paper deals with the natural mortality of the early young bivalve, Meretrix lusoria, (less than 13mm in shell length) and the perforations bored in the bivalve by bering snails, Neverita didyma and Natica severa. The investigation was carried out in the Kunsan area and in the laboratory from May to October of 1968. 2. The natural mortality of the field population during this period was
and among this number
were drilled by boring snails. 3. The common species of the Naticid gastropods, boring snails-Neverite didyma and Natice severa - are encountered in the habitat of M. lusoria. The perforations drilled by these species were broadly bevelled. 4. The location of the holes on the valves varied widely, while most of holes on the valves were located at a relatively definite umbo position. 5. The inner and outer diameters of the holes varied in proportion to the shell length of the clam; each ranging in shell length from 1 to 3mm, 3 to 6mm, and 6 to 13mm, and the outer diameters were 0.4-0.5mm, 0.7-0.9mm and 0.9-1.2mm. On the other hand, the ratio of the inner and outer diameters differed in proportion to the shell length of the clam. 6. Predation rates of Neverita didyma was much greater at night than during the day at room temperature. An average of 1.7 young clams was drilled and consumed, per snail, per day. This rate was greater than that of the Natica severa. 7 Predation rates varied in proportion to the shell length of the clam and the shell height of the snails.
SEASONAL VARIATION IN THE CHEMICAL COMPOSITION OF BROWN ALGAE WITH SPECIAL REFERENCE TO ALGINIC ACID
PARK Young-Ho ;
Korean Journal of Fisheries and Aquatic Sciences, volume 2, issue 1, 1969, Pages 71~82
The present investigations were carried out with the purpose of making clear the fundamental features of the seasonal variations in chemical composition of the brown algae. Three species of samples, Ecklonia cava, Sargassum sagamianum and Hizikia fusiforme have been analyzed monthly for their contents of total ash, crude protein, alginic acid, mannitol, and laminarin over a year period. Three kinds of samples were collected from the same locality, situated on the southern coast of the Che-ju Island, from September 1966 to August 1967. In addition, the comparative analysis was made on fronds and stipes of the plant for their chemical composition. The results obtained are summarized as follows: 1, In general, the three species examined underwent a similar mode of seasonal variation, and no essential difference was detected among them. 2. The chemical composition of the plant exhibited a considerable difference between the species. The content of total ash in H. fusiforme was remarkably higher than those in the two other species respectively. The alginic acid content was relatively high in S. sagamianum and low in H. fusiforme. The contents of crude protein, mannitol and laminarin were appreciably high in E. cava and low in H. fusiforme in general. 3. The most outstanding feature in the seasonal variation was that, in general, the total ash, crude protein, and alginic acid contents were at a maximum in the winter months while laminarin and mannitol contents were at a minimum. The converse was true in summer. Total ash-Maximum values were observed from December to February and minimum from August till October. Crude Protein-All species exhibited maxima in January and February, and minima from August to October. Alginic acid-Maximum contents occured from January to March and minimum from September to November. Mannitol-The maximum content of mannitol was In May and lune and minimum in January, February and March. Leminerin-Maximum content was in September and October, and minimum in January and February. 4. The wide seasonal variation in chemical constitution occured in the fronds, but the stipes showed a slight seasonal variation. In the chemical composition, the stipe was high in alginic acid, low in mannitol and laminarin. The reverse was in the frond.
SEASONAL VARIATION OF TOTAL NITROGEN CONTENT IN THE SEAWEED, GELIDIUM AMANSII LAMOUROUX
PARK Young-Ho ;
Korean Journal of Fisheries and Aquatic Sciences, volume 2, issue 1, 1969, Pages 83~86
The present investigations were made with the purpose of elucidating the seasonal variation in total nitrogen content of Gelidium amansii. Monthly samples were collected from the sea near pusan, from August 1957 to June 1959. The results obtained have been summarized as follows: The maximum total nitrogen content of Gelidium amansii was observed during the months of January and February, and the minimum content was observed in June and July Thus the total nitrogen content of Gelidium amansii exhibited a considerable periodic change throughout the year. The recommended harvest time of Gelidium amansii with regard to total nitrogen content, is from May to October, but on the other hand the proper harvest time is from May to June, with respect to the season of spore-formation and its propagation.
REARING OF THE LARVAL PRAWN, PENAEUS JAPONICUS BATE
PYEN Choong-Kyu ;
Korean Journal of Fisheries and Aquatic Sciences, volume 2, issue 1, 1969, Pages 87~91
Experiments on the rearing of larvae of the prawn, Penaeus japonicus Bate, have been con-ducted by using a large tank A (
) and two small tanks B and C (
). 1) Between spawning and the first zoeal stages, no significant elapsed time difference was noticed among the rearing tanks. At about
of water temperature nearly all of the larvae in the tanks metamorphosed into the first zoeal stage in about 36-48 hours. However the period of time which elapsed between the spawning and post-larval stage showed some differences bet-ween the tanks, i.e., 19-20 days in tank A and 15-17 days in tanks B and C, respectively 2) No difference in body length of the larvae has been observed among the three tanks. 3) The post-larva passed through several molts, one every four or five days, before reaching the young prawn about 36-40 days after spawning. 4) Throughout the zoeal stages the highest mortality was found at the time of molting between the first and second zoeal stages showing about
in tank A,
in tanks B and C, respectively. 5) Total mortality during the duration of the larval stages was around
in all the rearing tanks.