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体長組成解析によるサンマのいわゆる大型・中型等の検討
https://fra.repo.nii.ac.jp/records/2007207
https://fra.repo.nii.ac.jp/records/20072078a6f2b1b-ecb1-4434-9ff5-d5b6c45f32d0
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||||||||||
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| 公開日 | 2024-06-10 | |||||||||||||||||
| タイトル | ||||||||||||||||||
| タイトル | 体長組成解析によるサンマのいわゆる大型・中型等の検討 | |||||||||||||||||
| 言語 | ja | |||||||||||||||||
| 言語 | ||||||||||||||||||
| 言語 | jpn | |||||||||||||||||
| 資源タイプ | ||||||||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||||
| 資源タイプ | departmental bulletin paper | |||||||||||||||||
| アクセス権 | ||||||||||||||||||
| アクセス権 | metadata only access | |||||||||||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||||||||||||||
| 著者 |
松宮, 義晴
× 松宮, 義晴
× 田中, 昌一
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| 抄録 | ||||||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||||||
| 内容記述 | In accordance with the decline of the catch of the saury, Cololabis saira (BREVOORT), in recent years, the growth curve established in the years of a big catch has been subject to question. In the present paper, therefore, the length composition of the individual samples was examined to (1) assure the presence of the size groups or subpopulations (i.e. the so-called large- and intermediate-sized fish etc.), and to (2) estimate the length of each size group with regard to the growth within the fishing season. All of the length composition data were collected by the Tohoku Regional Fisheries Research Laboratory during the past twenty years (1952~1971). These fish were caught by the stick-held dip net in the Pacific off northern Japan. The length composition for each sample was tabulated in frequency distribution with a class interval of 1 cm; the sample size usually ranged from 50 to 100 fish, and the number of samples of each year, from 88 to 449; the annual mean value was 273. The histogram of the length composition showed various shapes; the unit group, however, seemed to have a normal distribution. The standard deviation was estimated from the 11 years' data whose length composition were monomodal throughout the fishing season; the mean value of 1.38 cm and the coefficient of variation of 0.051 were obtained. The simulation of mixing of two unit groups and sampling from the mixed population was tried for various differences of means and mixing ratios. For the separation of the polymodal distribution into the unit groups, the method of Cassie (1954) using the normal probability paper was used, paying due consideration to the results of the simulation. Plotting, according to the date of the catch, the unit groups, some of which were separated from the polymodal distribution, resulted in the following findings. The large-sized fish was well distinguishable from the intermediate-sized one; therefore, the presence of these two size groups of fish was ascertained; the degree of separation of the intermediate-sized fish from the small-sized one was, however, low. The mean length at mid October was estimated from the linear regression line of the length to the date of fishing which was applied to either of the large- and intermediate-sized fish. A decreasing trend of the length of the intermediate-sized fish in recent years was shown. Both of the slopes of the linear regression line of the large- and intermediate-sized fish were -0.58~0.39 cm/month, which were approximately 0. Whether the above value was plus or minus showed some correspondence with the seasonal change of the abundance index and catch in weight; therefore, it was considered that the saury shoal was continuously coming into and going out of the fishing ground and the success of catch depended much on the intensity of this movement. The standard deviation of the length of the intermediate-sized fish was a little larger than that of the large-sized one, and also the unit group, than what was separated from the polymodal distribution. The mean length of each size group was estimated from ten and several years' data. Some discussion was made for growth, subpopulation, age etc .. | |||||||||||||||||
| 言語 | en | |||||||||||||||||
| 抄録 | ||||||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||||||
| 内容記述 | 1. 近年のサンマの貧漁にともない,豊漁時代からの定説に種々の問題がでてきた.体長組織を名標本ごとに分析して,系統群(いわゆる大型·中型等)の存在の確認,各型の年々の月による大きさの推定を目的とした.2. 1952~'71年の東北区水産研究所資源部所有の火光利用棒受網による漁獲物体長組成データを用いた.測定誤差·標本の代表性·漁具等の選択性·雌雄による差について吟味し,重要な問題でないと判断した.3. 単位群と思われるものについて正規分布を想定し,正規確率紙により標準偏差を求め1.38cmを得た.変動係数は0.051 となり他魚種と比較して妥当なものと考えた.4. polymodal な分布の単位群への分解は,正規確率紙を利用する Cassie(1954)の方法により,正規型乱数表等を用いた色々なsimulation の結果を参考にして行なった.5. 解析の結果,大型·中型はだいたいよく分離し,判別でき,両型の存在を確認したが,中型·小型は分離の程度の悪いことがわかった.10月中旬の大型·中型の体長の経年変化を図示し,近年の中型の短小化を示した.6. 標準偏差は漁期内で変化せず,また,中型は大型ょり,単位群は bimode を単位群に分解したものより,わずかに大きい値となった.7. 漁期内の平均値の変化をみるため,大型·中型にあてはめた一次回帰の傾きは,大型·中型間とも,ほとんど0に近い.また,平均値が階段的変化をする年があることを示した.漁場別に分析した結果,25cm以下のものは2ヶ月間に3~3.5cm成長すると考えた.8. 極小型·小型·特大型の10月中旬の体長を,目測により直線をあてはめて推定し,大型·中型も含めて各型の10数ヶ年の平均値を求めた,また,春秋2系統群説に従って,中型·特大型間,小型·大型間,極小型·中型間の成長量の10数ヶ年の平均を求めた.9. 大型·中型間の標準偏差の差について3つの考えを述べ,単位群とbimodeのものの差について誤差の可能性の問題を考察し,結果に大きな影響を与えないと考えた.10. 一次回帰の傾きが0に近いこと,傾きのプラス·マイナスがその年の漁獲量·資源量指数の旬変化によく対応していること,平均値の階段的変化がおこること等により,漁獲物に成長が正しくあらわれず,漁獲に対して逸散·添加等の魚群の交代が大きく影響していると考えた.11. 成長·年令·系統群の過去の研究について述べ,先の各型の平均値,名型間の成長量と比較して,春秋2系統群説を一応認めたが,成長曲線に関しては渡辺(1965)の研究が一番妥当と考えた.12. 漁場の変化と魚体組成·資源量指数との関係および漁獲と漁場の状態との関係を述べ,これらと型別の分布·移動あるいは環境との対応は今後の重要な調査·研究課題と考えた. | |||||||||||||||||
| 言語 | ja | |||||||||||||||||
| bibliographic_information |
ja : 東北区水産研究所研究報告 en : Bulletin of Tohoku Regional Fisheries Research Laboratory 巻 33, 号 tnf_k_33_1, p. 1-18, ページ数 18, 発行日 1974-03 |
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| 出版者 | ||||||||||||||||||
| 出版者 | 東北海区水産研究所 | |||||||||||||||||
| 言語 | ja | |||||||||||||||||
| 出版者 | ||||||||||||||||||
| 出版者 | Tohoku Regional Fisheries Research Laboratory | |||||||||||||||||
| 言語 | en | |||||||||||||||||
| item_10002_source_id_9 | ||||||||||||||||||
| 収録物識別子タイプ | PISSN | |||||||||||||||||
| 収録物識別子 | 0049-402X | |||||||||||||||||
| item_10002_source_id_11 | ||||||||||||||||||
| 収録物識別子タイプ | NCID | |||||||||||||||||
| 収録物識別子 | AN00167637 | |||||||||||||||||
| 情報源 | ||||||||||||||||||
| 識別子タイプ | Local | |||||||||||||||||
| 関連識別子 | tnf_k_33_1 | |||||||||||||||||
| 関連サイト | ||||||||||||||||||
| 識別子タイプ | URI | |||||||||||||||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010092388 | |||||||||||||||||
| 言語 | ja | |||||||||||||||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||||||||||||||
