ブリ、メジ、サワラ、カツヲ等の體重に就ての一研究

宇田 道隆

doi:10.2331/suisan.1.124

On the Body-Weights of Some Scombroid Fishes of Japan

Mititaka UDA

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JOURNAL FREE ACCESS

1932 Volume 1 Issue 3 Pages 124-129

DOI https://doi.org/10.2331/suisan.1.124

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Published: September 20, 1932 Received: - Available on J-STAGE: July 08, 2008 Accepted: - Advance online publication: - Revised: -
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Date of correction: July 08, 2008 Reason for correction: - Correction: ABSTRACT Details: Wrong : The materials on which the present paper is based consist of two series: one obtained from Aziro fishing ground situated on the east coast of Penninsula Idu during a period of six years from 1927 to 1932, and the other taken from the records of many fishing boats working in the north-eastern waters of the Main Island of Japan from 1928 to 1930 inclusive. The first series includes the data on “Buri” (Seriola quinqueradiatu Temminck and Schlegel) and their younger stages (“Warasa” and “Inada”), “Mezi” (immature specimens of Thunnus thynnus (L)), and “Sawara” (Scomberomus niphonius Cuvier and Valenciennes), and the second contains those on “Katuwo” (Euthynnus vagans (Lesson)). For convenience's sake, the Japanese names of these fishes are used in the following lines. The average values of the body-weights for the specimens are plotted against the fishing seasons in Figs. 1, 3, and 4. There are to be seen two types in these figures in the variations of the body-weights. The first is characterized by sudden falls of the average body-weights during the fishing seasons as is, the case with those of “Buri” and “Katuwo” Probably such abrupt changes may be due to successive arrivals of two groups of the fish having different mean body-weights and of different ages to the fishing grounds. To put another way, the older fishes may come there mostly earlier than the younger. The second type as illustrated by the average body-weights of “Warasa”, “Inada”, “Mezi”, and “Sawara” shows gradual increases in the values as the fishing seasons proceed. It seems to me that these forms do not constitute exclusive groups of different mean body-weights in relation to different periods of the fishing season but comprise mixed assemblages of the younger and older ones irrespective of the periods. It may be mentioned that a growth curve of “Buri” is plotted in Fig. 2 on the assumption, as given in Table 1, that the average body-weights of this form in the different periods of the fishing season represent those of different year-classes.
Right : The materials on which the present paper is based consist of two series: one obtained from Aziro fishing ground situated on the east coast of Penninsula Idu during a period of six years from 1927 to 1932, and the other taken from the records of many fishing boats working in the north-eastern waters of the Main Island of Japan from 1928 to 1930 inclusive. The first series includes the data on “Buri” (Seriola quinqueradiatu Temminck and Schlegel) and their younger stages (“Warasa” and “Inada”), “Mezi” (immature specimens of Thunnus thynnus (L)), and “Sawara” (Scomberomus niphonius Cuvier and Valenciennes), and the second contains those on “Katuwo” (Euthynnus vagans (Lesson)). For convenience's sake, the Japanese names of these fishes are used in the following lines. The average values of the body-weights for the specimens are plotted against the fishing seasons in Figs. 1, 3, and 4. There are to be seen two types in these figures in the variations of the body-weights. The first is characterized by sudden falls of the average body-weights during the fishing seasons as is the case with those of “Buri” and “Katuwo” Probably such abrupt changes may be due to successive arrivals of two groups of the fish having different mean body-weights and of different ages to the fishing grounds. To put another way, the older fishes may come there mostly earlier than the younger. The second type as illustrated by the average body-weights of “Warasa”, “Inada”, “Mezi”, and “Sawara” shows gradual increases in the values as the fishing seasons proceed. It seems to me that these forms do not constitute exclusive groups of different mean body-weights in relation to different periods of the fishing season but comprise mixed assemblages of the younger and older ones irrespective of the periods. It may be mentioned that a growth curve of “Buri” is plotted in Fig. 2 on the assumption, as given in Table 1, that the average body-weights of this form in the different periods of the fishing season represent those of different year-classes.

Date of correction: July 08, 2008 Reason for correction: - Correction: CITATION Details: [in Japanese]

Date of correction: July 08, 2008 Reason for correction: - Correction: PDF FILE Details: -

Abstract

The materials on which the present paper is based consist of two series: one obtained from Aziro fishing ground situated on the east coast of Penninsula Idu during a period of six years from 1927 to 1932, and the other taken from the records of many fishing boats working in the north-eastern waters of the Main Island of Japan from 1928 to 1930 inclusive. The first series includes the data on “Buri” (Seriola quinqueradiatu Temminck and Schlegel) and their younger stages (“Warasa” and “Inada”), “Mezi” (immature specimens of Thunnus thynnus (L)), and “Sawara” (Scomberomus niphonius Cuvier and Valenciennes), and the second contains those on “Katuwo” (Euthynnus vagans (Lesson)). For convenience's sake, the Japanese names of these fishes are used in the following lines. The average values of the body-weights for the specimens are plotted against the fishing seasons in Figs. 1, 3, and 4. There are to be seen two types in these figures in the variations of the body-weights. The first is characterized by sudden falls of the average body-weights during the fishing seasons as is the case with those of “Buri” and “Katuwo” Probably such abrupt changes may be due to successive arrivals of two groups of the fish having different mean body-weights and of different ages to the fishing grounds. To put another way, the older fishes may come there mostly earlier than the younger. The second type as illustrated by the average body-weights of “Warasa”, “Inada”, “Mezi”, and “Sawara” shows gradual increases in the values as the fishing seasons proceed. It seems to me that these forms do not constitute exclusive groups of different mean body-weights in relation to different periods of the fishing season but comprise mixed assemblages of the younger and older ones irrespective of the periods. It may be mentioned that a growth curve of “Buri” is plotted in Fig. 2 on the assumption, as given in Table 1, that the average body-weights of this form in the different periods of the fishing season represent those of different year-classes.

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