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Volume 35, Issue 2
Displaying 1-10 of 10 articles from this issue
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Akira WATANUKI, Hidekazu YAMAMOTO, Shogo ARAI1987 Volume 35 Issue 2 Pages 69-75
Published: September 30, 1987
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESS -
Masaru TATEISHI, Yoshihiro IKEDA1987 Volume 35 Issue 2 Pages 77-82
Published: September 30, 1987
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESS -
Yoshioki OZEKI, Takeshi ONO, Hideto HIRAKAWA, Yukio IWATSUKI, Reijiro ...1987 Volume 35 Issue 2 Pages 83-90
Published: September 30, 1987
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSThe transport mechanism of larvae of stone flounder, Kareius bicoloratus was investigated from January 23th to February 17th, 1986 in the mouth of Matsukawaura inlet, Fukushima prefecture. The number of larvae peaked on January 27th and decreased gradually then after. A diurnal peak of occurrence was observed at the turning point of the tide (flooding to ebbing) . The peak occurred during the day time only.
The size of the larvae caught at Matsukawaura inlet at both the inflow and outflow were mostly 3.0-7.0mm in total length. Larvae with size greater than 11 mm were few and those between 7-11 mm were very few. This suggests that the first feeding stage larvae (3.0-5.0 mm in total length) had already reached near the coast of Matsukawaura and transported by the tide into the inlet.
Results of gut analysis using histolgical staining of rectal epithelial cells and food occurrence methods showed that more than 80% of the larvae were found to be feeding.View full abstractDownload PDF (774K) -
Teru IORIYA, Hidekazu SUZUKI1987 Volume 35 Issue 2 Pages 91-98
Published: September 30, 1987
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSSessile diatom communities on plastic plates used for rearing of juvenile abalone, Nordotis discus, were observed in detail at Banda Marine Laboratory of Tokyo University of Fisheries in Chiba Prefecture. The plastic plates were put in an outdoor tank without abalone. Within seven to ten days, the plates were fouled with the thick filaments of diatoms such as Navicula britannica, Nitzschia closterium, N. longissima and Bacillaria paxillifera, which formed stratified overstock assemblages. After abalone introduction onto the plates, these diatoms disappeared; and Cocconeis dirupta, C. scutellum var. scutellum, and C. scutellum var. ornata proliferated remarkably and assemblages became a uniform layer of prostrate cells. It was suggested that these prostrate diatoms were suitable initial food for creeping juveniles of abalone. In the absence of grazing pressure by abalone, the algal community on the plate did not result in uniform layer assemblage.View full abstractDownload PDF (4259K) -
Tatsuo HAMANO, Munenori HAYASHI, Shuhei MATSUURA, Masaru AMIO1987 Volume 35 Issue 2 Pages 99-106
Published: September 30, 1987
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSSelection of attachment substrate during daytime by the abalone Nordotis discus was studied in an experimental box over two seasons, summer and winter. Animals preferred narrower spaces between near horizontal surfaces and attachment upside down on the upper surface. Respiratory holes were not preferentially turned towards an open area. Abalones attached by raising their right or left side more frequently than by raising the head or posterior. The number of abalones raising the right side was almost equal to that raising the left side. Individuals aggregated in summer better than in winter. The larger abalones were in size, the more they attached with a supine posture and 89% of total number of adults tested adopted this posture.View full abstractDownload PDF (846K) -
Mamoru SATO, Ryosuke KUROSHIMA, Reiji YOSHINAKA, Shizunori IKEDA1987 Volume 35 Issue 2 Pages 107-111
Published: September 30, 1987
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSNauplii of Anemia saliva from Brazil, San Francisco and China in 1981 were analyzed for nutritive components in order to clarify their food value to fish.
There was no appreciable difference in the proximate compositions of nauplii of Anemia saliva among the three locations. Calcium content of Anemia nauplii from China was about twice as much as that from Brazil and phosphorus content was about a half of that from Brazil. Vitamin B6 content in nauplii of Artemia from China was lower than that from San Francisco and from Brazil. However, there was no remarkable difference in the contents of niacin, biotin, pantothenic acid and ascorbic acid in nauplii of Anemia among the different locations. Artemia nauplii from San Francisco, Brazil and China were found to be high in contents of ascorbic acid and ascorbic acid 2-sulfate. No conversion of ascorbic acid 2-sulfate into ascorbic acid was observed after starvation of newly hatched Artemia for 42h. Fatty acid composition of Anemia from San Francisco was found to be high in the content of linolenic acid and quite low inthe contents of eicosapentaenoic acid and docosahexaenoic acid.View full abstractDownload PDF (483K) -
Ryosuke KUROSHIMA, Mamoru SATO, Reiji YOSHINAKA, Shizunori IKEDA1987 Volume 35 Issue 2 Pages 113-117
Published: September 30, 1987
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSSeveral nutritive components of zooplankton collected at Maizuru Bay in October, 1982, and from May to August, 1983, were analyzed in order to clarify their food value to fish.
There was no remarkable difference in the proximate compositions among the wild zooplankton collected in October, May, June, July and August. The crude protein content of the wild zooplankton was higher than that of nauplii of Artemia salina. The content of vitamin B6 was higher in the zooplankton of June than those of July and August. It was found that the content of viamin B6 in wild zooplankton was higher thanthat of Artemia salina nauplii. Furthermore, pyridoxine was detected in the wild zooplankton, but not detected in Anemia salina nauplii.
Lipids of the wild zooplankton were rich in eicosapentaenoic acid and docosahexaenoic acid. Seasonal variation of fatty acid composition of the total lipid did not find markedly in the wild zooplankton.
Wild zooplankton was found to be high in the contents of ascorbic acid and ascorbic acid 2-sulfate. However, the content of total ascorbic acid and the ratio of ascorbicacid 2-sulfate were lower than those of Anemia salina nauplii.View full abstractDownload PDF (373K) -
Yoshiaki TANAKA1987 Volume 35 Issue 2 Pages 119-124
Published: September 30, 1987
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSRates of nitrogenous excretion in the forms of ammonium, urea, and other nitrogen compound (amino acids) were determined for the rotifer at different concentrations of marine Chlorella.
The gross excretion rate of nutrients (ammonium and urea) by the rotifer was estimated by summing the apparent excretion rate and nutrients removed by marine Chlorella. Nutrient uptake rate of the Chlorella was determined by using the Michaelis-Menten kinetic.
The rate of total nitrogenous excretion by the rotifer increases with food concentration to a maximum level. This excretion rate may be expressed as ETot=Eb+Ef, and Ef=Efm [1-exp (-kf⋅ C/R) ] in which Eb=a basal rate due to endogenous excretion (μg/animal day) ; Ef=a rate due to release from digested and metabolized material (μg/animal day) ; Efm=the maximum rate of Ef; kf=a constant rate of change of excretionwith the Chlorella concentration; C/R=the mean concentration of cells per the meandensity of rotifer.
Data from the retifer in this experiments could be expressed with the equations as ETot=0.7×10-2+3.7×10-2 [1-exp (-0.46×10-5× C/R) ] at 20°C, and ETot=0.9×10-2+5.1×10-2 [1-exp (-0.46×10-5× C/R) ] at 30°C.View full abstractDownload PDF (572K) -
Haruo SUGITA, Naoto OKAMOTO, Shoji OKUSHIMA, Yoshiaki DEGUCHI1987 Volume 35 Issue 2 Pages 125-131
Published: September 30, 1987
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSThe suitable conditions for growth of the protozoa, which were isolated from the seawater of coastal regions, were examined. The protozoa was composed of 4 species of ciliates, Trichopelmidae, Saprophilus sp., Uronema sp. and Cyclidium sp. and 2 species of flagellates, Monas termo and Monas sp.
Achromogenic bacteria, genera Vibrio and Acinetobacter were found to be suitable prey organisms for the bacterivorous protozoa. The highest values of maximum yield of these organisms were observed at the temperature ranging from 15 to 25°C in the 60 to 100% seawater.View full abstractDownload PDF (587K) -
1987 Volume 35 Issue 2 Pages e1
Published: 1987
Released on J-STAGE: March 09, 2010
JOURNAL FREE ACCESSDownload PDF (17K)
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