Gross and histological observations of ovarian development in twaite shad, Alosa fallax fallax, from Rivers Mira and Guadiana (Portugal)
In order to describe the stages of oogenesis of twaite shad, Alosa fallax fallax, 265 females were collected between March and June 1997, February and June 1998 and January and April 1999 in the Rivers Mira and Guadiana. From the histological study of ovaries a total of eight developmental stages we...
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| Format: | Article |
| Language: | English |
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Consejo Superior de Investigaciones Científicas
2003-09-01
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| Series: | Scientia Marina |
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| Online Access: | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/481 |
| _version_ | 1818941514772905984 |
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| author | Teresa Pina Eduardo Esteves José Pedro Andrade |
| author_facet | Teresa Pina Eduardo Esteves José Pedro Andrade |
| author_sort | Teresa Pina |
| collection | DOAJ |
| description | In order to describe the stages of oogenesis of twaite shad, Alosa fallax fallax, 265 females were collected between March and June 1997, February and June 1998 and January and April 1999 in the Rivers Mira and Guadiana. From the histological study of ovaries a total of eight developmental stages were delineated. Gross examination of paired ovary revealed that they could be placed into one of seven maturity stages according to their stage of development. Two stages of atresia, alfa and beta, were identified. Upon cessation of spawning, the ovaries still contained some oocytes at various stages of development but with a greater number of atretic oocytes. The simultaneous occurrence of oocytes at different stages of development in the ovary indicates asynchronous oocyte development. Oocyte size frequency distributions do not show a gap in size between cortical alveoli and vitellogenic oocytes during the spawning season. This may represent the ability of twaite shad to push oocytes through vitellogenesis from a previtellogenic condition during the spawning period. This has important implications for twaite shad fecundity, because fish with this type of oocyte development depend on estimates of batch fecundity and spawning frequency to determine potential annual fecundity. |
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| format | Article |
| id | doaj.art-4412e979920d456fa813c478b75a52d9 |
| institution | Directory Open Access Journal |
| issn | 0214-8358 1886-8134 |
| language | English |
| last_indexed | 2024-12-20T06:56:45Z |
| publishDate | 2003-09-01 |
| publisher | Consejo Superior de Investigaciones Científicas |
| record_format | Article |
| series | Scientia Marina |
| spelling | doaj.art-4412e979920d456fa813c478b75a52d92022-12-21T19:49:18ZengConsejo Superior de Investigaciones CientíficasScientia Marina0214-83581886-81342003-09-0167331332210.3989/scimar.2003.67n3313476Gross and histological observations of ovarian development in twaite shad, Alosa fallax fallax, from Rivers Mira and Guadiana (Portugal)Teresa Pina0Eduardo Esteves1José Pedro Andrade2CCMar, Universidade do Algarve, Faculdade de Ciências do Mar e do AmbienteCCMar, Universidade do Algarve, Faculdade de Ciências do Mar e do AmbienteCCMar, Universidade do Algarve, Faculdade de Ciências do Mar e do AmbienteIn order to describe the stages of oogenesis of twaite shad, Alosa fallax fallax, 265 females were collected between March and June 1997, February and June 1998 and January and April 1999 in the Rivers Mira and Guadiana. From the histological study of ovaries a total of eight developmental stages were delineated. Gross examination of paired ovary revealed that they could be placed into one of seven maturity stages according to their stage of development. Two stages of atresia, alfa and beta, were identified. Upon cessation of spawning, the ovaries still contained some oocytes at various stages of development but with a greater number of atretic oocytes. The simultaneous occurrence of oocytes at different stages of development in the ovary indicates asynchronous oocyte development. Oocyte size frequency distributions do not show a gap in size between cortical alveoli and vitellogenic oocytes during the spawning season. This may represent the ability of twaite shad to push oocytes through vitellogenesis from a previtellogenic condition during the spawning period. This has important implications for twaite shad fecundity, because fish with this type of oocyte development depend on estimates of batch fecundity and spawning frequency to determine potential annual fecundity.http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/481oogenesisoocyte dynamicsalosa fallax fallaxportugal |
| spellingShingle | Teresa Pina Eduardo Esteves José Pedro Andrade Gross and histological observations of ovarian development in twaite shad, Alosa fallax fallax, from Rivers Mira and Guadiana (Portugal) Scientia Marina oogenesis oocyte dynamics alosa fallax fallax portugal |
| title | Gross and histological observations of ovarian development in twaite shad, Alosa fallax fallax, from Rivers Mira and Guadiana (Portugal) |
| title_full | Gross and histological observations of ovarian development in twaite shad, Alosa fallax fallax, from Rivers Mira and Guadiana (Portugal) |
| title_fullStr | Gross and histological observations of ovarian development in twaite shad, Alosa fallax fallax, from Rivers Mira and Guadiana (Portugal) |
| title_full_unstemmed | Gross and histological observations of ovarian development in twaite shad, Alosa fallax fallax, from Rivers Mira and Guadiana (Portugal) |
| title_short | Gross and histological observations of ovarian development in twaite shad, Alosa fallax fallax, from Rivers Mira and Guadiana (Portugal) |
| title_sort | gross and histological observations of ovarian development in twaite shad alosa fallax fallax from rivers mira and guadiana portugal |
| topic | oogenesis oocyte dynamics alosa fallax fallax portugal |
| url | http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/481 |
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