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Volume 17, Issue 7
Displaying 1-6 of 6 articles from this issue
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MORISABURQ TAUTI1952 Volume 17 Issue 7 Pages 179-182
Published: March 25, 1952
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSDownload PDF (218K) -
(II) Observation on the Plankton in Spring during the period 1949-1950TAKUO CHIBA1952 Volume 17 Issue 7 Pages 183-186
Published: March 25, 1952
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSThis is the second report of my observation on the plankton in the Eastern China Sea and Yellow Sea. This observation has been studied from April to June, for the years 1949-1950.
The methode emploved in the present work was the same at that the former investigation, the plankton samples were obtained by vertical hauls and filtered through a plankton net made of 20 bolting silk at 22 fishining grounds.
As dominants species in phytoplankton the following kinds can be recorded; Coscinodiscus janishii and C. asteromphalus at April, Rhizosolenia hebetata ƒ. semispina, R. alata ƒ. indica, R. alata ƒ. gracillima at May, Stephanopyxis Palmeriana, Thalassiothrix longissima, Chaetoceras spp. at June.
In zooplankton Paracalanus aculeatus, Oithona similis, Nauplii oƒ Copepoda can be seen from April to June. Other kinds different from above mentioned can be recorded namely Noctiluca scintillans, Peridinium divergens at May, and Oikopleura longicauda, Doliolum nationalis at June.View full abstractDownload PDF (283K) -
(III) Observation on the Plankton in Autumn during the Years 1948-1949TAKUO CHIBA1952 Volume 17 Issue 7 Pages 187-190
Published: March 25, 1952
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSThis is the third report of my observation on the plankton in the Eastern China Sea and Yellow Sea. This observation has been studied from October to December, for the years 1948-1949.
The plankton samples here dealt with were obtained by vertical hauls at 11 fishing grounds.
As dominant species in phytoplanktons, can be recorded as the following. Coscinodiscus sp., Corethron petsgicum at 1948, and Biddulphia sinensis, B, aurita, Ptanktoniella sol, Coscinodiscus janishii, Ditylium Brightwetli at 1949. In zooplankton Oithona similis, Palacatanus aculeatus, Salpa vrmueronata, S. democratica, Nauplii of Copepoda, Veliger tarvae and several kinds of Foraminifera can be seen.
Generally the phytoplankton are very, variable but the zooplankton not so variable through the both years. Considering from the fact that the composition of the plankton consisting of only several kinds of tetnpolate oceanic planktons and on the contrary consisting of rather many littoral plankton, I imagine that the influence of the water of China regions and the West Corean Strait is very great.View full abstractDownload PDF (268K) -
A new steam-distilling method for the determination of volatile base in fish fleshTETUO TOMIYAMA, KATSUMI IDE, TSUTOMU AKIYAMA1952 Volume 17 Issue 7 Pages 191-196
Published: March 25, 1952
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSA new steam-distilling method has been presented for the determination of the volatile base-N in fish flesh. Data have been presented showing that the fish muscle brei on direct steam distillation at either pH 7.6 or 9.0 gave value of about 145% of that obtained by the vacuum method, whereas a 1-3% trichloracetic acid extract of the brei gave value of nearly the same as that by the vecuum method, irrespectively of the freshness of the sample used.
The procedure for the determination is as follows: To a 16-g. portion flesh brei are added 100cc. water intimately mixing. Then 50cc. of 7% trichloracetic acid are gradually added with a constant stirring, followed by the filtration with a dry filter paper. The filtrate is subject to the steam distillation using the apparatus shown in Fig. 1. Firstly, 5cc. of n/14 H2SO4 are taken in the distillate-receiving tube, E, Which is connected to the cooler, C, as shown in Fig. 1. Then, a 50-cc. portion of the filtrate is poured into the inner tube of the apparatus, D, and 10cc. of 10% potassium carbonate are added. Next, the steam is passed into the inner tube by way of the steam jacket. when the distillate amounts to 40cc., the receiving tube is disconnected. The sample remained in the inner tube of the apparatus, D, is drawn out into the outer jacket by clamping both c2 and c3. Through the receiving tube carbon dioxide-free air is passed for longer than three minutes. An excess acid remained is titrated with n/28 NaOH using methyl red as indicator. The mg.%-value for volatile base-N can becalculated by equation (1) or approximate equation (2). The above procedure enables us to reduce the time required for one determination to about one-fourth of that required for the vacuum-distilling procedure.View full abstractDownload PDF (430K) -
HIROSHI FUJITA1952 Volume 17 Issue 7 Pages 197-205
Published: March 25, 1952
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSAs a contination of the previous paper [1], in which an appoximate solution of one-dimensional freezing equation for fish fillets has been given for the case of a rather small value of Brot's number by applying the well known KARMAN-POHLHAUSEN'S method in the theory of boundary layer equation, the author, in this paper, attempts to solve the same problem for the case oi iniinitely large BIOT's number with the aid of YAMDA'S method [4], which gives as the zeroth approximation the result obtained by KARMAN-POHLHAUSEN'S method.View full abstractDownload PDF (418K) -
MINORU KAWAZIRI1952 Volume 17 Issue 7 Pages 206-210_2
Published: March 25, 1952
Released on J-STAGE: February 29, 2008
JOURNAL FREE ACCESSThe catch of Tribolodon hakonensis has shown a great decrease recently in Chikuma River, middle Japan. From the fact that many young fishes have been caught by the “Ishizuka”, Nagano Prefectural Government prohibited this particular gear since 1946, however, there were heard varied opinions among fishermen as to its effect and, as the result, to remove the regulation.
The “Ishizuka”, set up in early winter, is a mound composed of stones as, large as or larger thna humna head, measuring 50cm high and 100 to 150cm in diameter at bottom, the mound is built in the water 70 to 80cm deep with graduated slope toward the mainfolow of the river, also the entire “Ishizuka” is covered with straw-mat except the sloped part where the stones are flattened mixed with smaller gravels. In early spring, the mound is surrounded by bamboo-blinds and a trap is set against sloped part, then the stones are picked up piece by piece. The fish, mostly T. hakonensis, which conceal themselves in the space of stones during the winter, escape the mound and are easily trapped.
Experimental “Ishizuka” numbering 17 were set in November 1948-'49, and the fish 4699 caught following spring were studied on age and length. The age determination by scale on these fish showed 59.5% of one year old, 19.8% of two, 16.6% of three and other older. It is thus apparent that the “Ishizuka” destroys tie younger generation of fish.
1 propose to regulate strictly the fishing by “Ishizuka” but rather utilize the mound for the protection of young by the hand of fishermen.View full abstractDownload PDF (428K)
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