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| Registros recuperados: 18 | |
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| Wöhler, O.C.. |
| Length and age at first maturity was estimated, and the distribution of the spawning stock of castaneta (Cheilodactylus bergi) was analyzed, with the aim of understanding the spawning activity and its relation with oceanographic parameters. Samples came from two research cruises carried out in the Argentine-Uruguayan Common Fishing Zone (CFZ) (SW Atlantic, between 34 degree and 39 degree 30'S), during the end of spawning period (May-June) of 1991 and 1993. Length at first maturity was estimated in 21.34 cm and 23.69 cm of total length, for males and females respectively. Age at first maturity estimated for sexes combinated corresponding to 2.60 years. A spawning area in the north (between 35 degree and 37 degree S) was determined, showing a high incidence... |
| Tipo: Journal Contribution |
Palavras-chave: Fishing grounds; Sexual maturity; Spawning seasons; Mortality; Environmental conditions. |
| Ano: 1997 |
URL: http://hdl.handle.net/1834/5795 |
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| Wöhler, O.C.. |
| Length and age at first maturity was estimated, and the distribution of the spawning stock of castaneta (Cheilodactylus bergi) was analyzed, with the aim of understanding the spawning activity and its relation with oceanographic parameters. Samples came from two research cruises carried out in the Argentine-Uruguayan Common Fishing Zone (CFZ) (SW Atlantic, between 34 degree and 39 degree 30'S), during the end of spawning period (May-June) of 1991 and 1993. Length at first maturity was estimated in 21.34 cm and 23.69 cm of total length, for males and females respectively. Age at first maturity estimated for sexes combinated corresponding to 2.60 years. A spawning area in the north (between 35 degree and 37 degree S) was determined, showing a high incidence... |
| Tipo: Journal Contribution |
Palavras-chave: Fishing grounds; Sexual maturity; Spawning seasons; Mortality; Environmental conditions. |
| Ano: 1997 |
URL: http://hdl.handle.net/1834/5793 |
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| Aristizabal, E.O.. |
| Spontaneous spawning of red porgy was achieved in captivity by using photoperiod and temperature control systems along the year. During a four-month reproduction period females released in average about 0.2 times their own body weight in oocytes with an energy content of 5.71 J mg-1 wet weight. A total of 28.8 x 106 eggs and approximately 200 g of viable eggs (wet weight) per female kg were obtained. The eggs and larvae quality in terms of hatching and larval survival rates experienced a significant variation during the spawning season ranging between 0%-92% and 0.3%-33.2% respectively. Comments in reference to the probable causes of these variations and the need of carrying on with this line of research are presented. |
| Tipo: Journal Contribution |
Palavras-chave: Fish culture; Marine aquaculture; Spawning seasons; Fish culture; Http://aims.fao.org/aos/agrovoc/c_2918. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/1569 |
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| Kaufmann, R.. |
| A pesar de que la presencia de la tortuga canal Dermochelys coriacea en las playas al este de Santa Marta era conocida por los mismos tortugeros, esta publicación preliminar es el primer informe científico sobre la anidación de esta especie en Colombia. En el año de 1970 observaron los inspectores del "INDERENA" y el autor, en la playa comprendida entre los ríos Don Diego y Buritaca, 7 hembras desovando, más 4 nidos y 7 nacimientos. Se describe el comportamiento de anidación, comparándolo con el de otras tortugas marinas. Dos de los animales observados fueron marcados, uno de ellos re-encontrando por los guardias del “Inderena”, desovando nuevamente después de 20 días. |
| Tipo: Journal Contribution |
Palavras-chave: Aquatic reptiles; Spawning seasons. |
| Ano: 1971 |
URL: http://hdl.handle.net/1834/3277 |
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| Pájaro, M.. |
| Cannibalism is not an abnormal behaviour and it can be observed in a wide number of animals. In Pisces, cannibalism may be the result of endogenous intraspecific factors (nutritional state, size, age, state of development) or exogenous intraspecific factors (food, density, light). Nevertheless, external fertilization and the high fecundity of teleost fish tend to increase egg cannibalism, in particular among filter feeding fishes such as anchovies. In the present work, two important Argentine anchovy Engraulis anchoita stocks were studied. The first is to the north of 41°S, and spawns during spring on the coastal and shelf waters of Buenos Aires Province,Argentina, and Uruguay. The second one inhabits the Patagonian region, from 41°S to 47°S. It spawns... |
| Tipo: Theses and Dissertations |
Palavras-chave: Feeding behaviour; Cannibalism; Natural mortality; Fish larvae; Fish eggs; Spawning seasons; Stocks; Food preferences; Reproduction; Stocks; Food preferences; Feeding behaviour; Cannibalism; Fish larvae; Reproduction; Http://aims.fao.org/aos/agrovoc/c_28772; Http://aims.fao.org/aos/agrovoc/c_3024; Http://aims.fao.org/aos/agrovoc/c_10778; Http://aims.fao.org/aos/agrovoc/c_9580; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_6507. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/1476 |
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| Bouriga, N.; Cherif, M.; Hajjej, Gh.; Guignard, J-P.; Faure, E.; Trabelsi, M.. |
| Le présent travail porte sur l’étude des caractères biométriques des athérines de Tunisie pour compléter les études métriques et méristiques établies auparavant. L’objectif principal de cette étude, est de comparer les paramètres biologiques via l’analyse de la croissance et de la reproduction de Atherina boyeri (côtes nord tunisiennes) et Atherina lagunae (île Kerkennah). L’étude de la sex-ratio en fonction des mois a montré que les femelles sont toujours plus nombreuses que les mâles pour les espèces d’athérines. En effet, la valeur globale de la sex-ratio, toute taille confondue, est en faveur des femelles. L’étude du cycle sexuel des athérines insulaires des îles Kerkennah a montré que la période de reproduction s’établie entre le mois de mars et le... |
| Tipo: Journal Contribution |
Palavras-chave: Coastal lagoons; Sex ratio; Growth rate; Length-weight relationships; Spawning seasons. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4693 |
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| Sley, A.; Jarboui, O.; Bouain, A.. |
| Ce travail constitue une étude comparative entre les paramètres de reproduction de Caranx crysos et ceux de Caranx rhonchus du golfe de Gabès. Afin de déterminer la maturité sexuelle, le cycle sexuel et la période de ponte, les mensurations ont été relevées sur un échantillon de C. crysos composé de 1668 individus (95mm ≤ LT≤ 416 mm) et de 1313 individus de Caranx rhonchus (10mm≤LT≤306 mm). Il ressort de cette étude que Caranx rhonchus atteint sa maturité sexuelle (LT50% femelles = 182,09 mm et LT50% mâles = 182,2 mm) à une taille inférieure à celle estimée chez Caranx crysos (LT50% femelles = 259,79 mm et LT50% mâles = 245,88 mm). En outre, les variations mensuelles du Rapport Gonado-Somatique (RGS%), montre des cycles sexuels synchrones pour les mâles et... |
| Tipo: Journal Contribution |
Palavras-chave: Spawning seasons; Reproduction. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5902 |
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| Dia, M.; Wague, A.; Ghorbel, M.. |
| L’étude de la reproduction de Diplodus sargus cadenati, de la côte de Nouadhibou a porté sur 513 individus de longueurs à la fourche comprises entre 13,2 cm et 32,2 cm. Cette étude a montré que la période de ponte de cette espèce s’étend de janvier à avril, période où la température de l’eau est en moyenne de 18,4°c. La taille (L50) à la laquelle 50% des individus sont matures est de 21,47 ± 0,45 cm de longueur à la fourche (Lf) pour les mâles et de 20,79 ± 0,55 cm pour les femelles. L’étude de la sex-ratio n’a pas montré la dominance de l’un ou de l’autre sexe. |
| Tipo: Journal Contribution |
Palavras-chave: Animal physiology; Marine fish; Methodology; Reproduction; Sex ratio; Size-at-first-maturity; Spawning seasons; Statistical tables; Fishery biology; Marine fishes. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/4490 |
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| Pájaro, M.; Macchi, G.J.; Ehrlich, M.D.. |
| Batch fecundity and spawning frequency of Argentine hake inhabiting Patagonian waters south of 41° S were estimated using monthly samples collected during the December 2000-March 2001 reproductive season and at the end of the March 2002 spawning period. Batch fecundity was fitted to a power function of total length and a linear function of ovary-free female weight with values ranging between 100,000 (32 cm total length) and 2,300,000 (87 cm total length) hydrated oocytes. Batch and relative fecundity showed variations during the spawning season with a marked decrease towards the end of the reproductive period (March). The spawning frequency, which ranged between 0.10 and 0.15, was estimated from the proportion of females with day-1 postovulatory follicles... |
| Tipo: Journal Contribution |
Palavras-chave: Spawning seasons; Ovaries; Hake fisheries; Ovaries; Http://aims.fao.org/aos/agrovoc/c_5456. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/1566 |
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| Souza,Geysa Marinho de; Monteiro-Neto,Cassiano; Costa,Marcus Rodrigues da; Bastos,Ana Luiza; Martins,Raquel Rennó Mascarenhas; Vieira,Francyne Carolina dos Santos; Andrade-Tubino,Magda Fernandes de; Tubino,Rafael de Almeida. |
| ABSTRACT The bluefish, Pomatomus saltatrix (Linneus 1766) is captured by industrial, artisanal, and recreational fisheries throughout its distribution range. The reproductive biology of P. saltatrix in the southwestern Atlantic was studied using 1,102 specimens captured by the Brazilian commercial fleet between March 2014 and December 2015. The recruitment period was identified from records of juveniles in experimental beach seine hauls carried out on sandy beaches in the external sector of Guanabara Bay for four years (2012-2015). Based on the reproductive indices and on the macro- and microscopic analyses of the gonads, spawning peaks were identified in autumn and spring. The size at first maturity was estimated at 35.5, 38.3, and 37.4 cm for females,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fecundity; Histology; Oocyte development; Reproductive dynamics; Spawning seasons; Young-of-the-year. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702021000100301 |
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| Jaspers, E.; Avault, J.W. Jr.; Roussel, J.D.. |
| Several testicular and spermatological parameters of 48 male channel catfish, <i>Ictalurus punctatus</i> (Rafinesque) were studied during 6 months (November through April) outside the spawning season. Two stocks (a domestic and a wild one) and within each stock 2- and 3-year-old fish were compared. Within age-groups, the domestic fish were considerably larger than the wild ones. In each stock, the 3-year-olds outgrew the 2-year-olds. The testes consisted of a white spermatogenic and pink glandular part, averaging 1.14 and 0.56 g respectively. A significant increase in both parts was noticed in March, continuing during April. One 3-year-old male in each stock was azoospermic, even though these fish had well developed testes and exhibited... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gonads; Spawning seasons; Ictalurus punctatus. |
| Ano: 1978 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3585 |
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| Registros recuperados: 18 | |
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