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Morphometric changes during growth of the brook lamprey Lampetra reissneri
| Content Provider | Semantic Scholar |
|---|---|
| Author | Tsuneki, Kazuhiko Ouji, Masami |
| Copyright Year | 1984 |
| Abstract | The brook lamprey(Lampetra reissneri)was collected at the Hosshoji River,Tottori Prefecture,Japan,once a month for a year.Metamorphosing individuals were collected in autumn and immature adults in winter.Ammocoetes larvae were collected throughout the year.From size-frequency histograms,the larval period was estimated to be more than three and one-half years.Ammocoetes larger than 160mm in total length were always female.Metamorphosing and adult females were larger than corresponding males.This may mean that at least some females metamorphose one year later than males.In ammocoetes,the relative prebranchial and branchial length decreased,and the relative tail length increased during growth.Egg diameter increased rapidly during metamorphosis. The cyclostomes,hagfishes and lampreys,are extant agnathans and supply critical material for evaluation of lower vertebrate phylogeny (Janvier and Blieck,1979;Novitskaya,1981). To persons who work in this field,the natural history of cyclostomes should be well-documented to ensure a constant supply of animals and for general background knowledge.In a previous paper,we reported seasonal migration and annual gonadal changes of the hagfish, Eptatretus burgeri(Tsuneki et al.,1983).In this and a following paper(Tsuneki and Ouji, in press),we will report the life history of the non-parasitic brook lamprey,Lampetra reissneri (Dybowski),with special reference to changes in the external morphology and in some internal organs.The life history of non-parasitic lampreys has been extensively studied in European and North American rivers(Hardisty,1944, 1961a,Hardisty and Potter,1971a,b;Rohde et al.,1976;Malmqvist,1978;Seagle and Nagel,1982),but only a few reports(Yamada, 1951)are available in Far Eastern rivers. Morphometrical studies will be dealt with in this paper,and histological studies in the following paper. Materials and methods Lampetra reissneri was collected at the Hosshoji River,Tottori Prefecture,Japan.This is a tributary of the Hino River which empties into the south-western part of the Japan Sea. The lamprey were distributed along at least 6 km of the mid-stream of the Hosshoji River.The materials for this study were collected exclusively at"Point G"(35•‹20•Œ20••N,133•‹16•Œ52••E). Collections were made on about the 10th of each month from January through December, 1982.A shovel and net were used for the cap- |
| Starting Page | 38 |
| Ending Page | 46 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.11369/jji1950.31.38 |
| Volume Number | 31 |
| Alternate Webpage(s) | https://www.jstage.jst.go.jp/article/jji1950/31/1/31_1_38/_pdf/-char/ja |
| Alternate Webpage(s) | https://doi.org/10.11369/jji1950.31.38 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
