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| Registros recuperados: 79 | |
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| Limeira,Daniel M.; Renesto,Erasmo; Zawadzki,Cláudio H.. |
| Two allopatric morphotypes of the genus Rinelocaria were compared through the allozyme electrophoresis technique: one morphotype, R. pentamaculata, from the Keller River in the middle stretch of the Ivaí River basin and the other, R. aff. pentamaculata, from the São João River in the upper portion of the Ivaí River basin. The morphotype from the São João River was collected upstream from the São João waterfall, which is about 80 m deep. Twelve enzymatic systems (AAT, ADH, EST, GCDH, G3PDH, GPI, IDH, LDH, MDH, ME, PGM and SOD) were analyzed, which allowed to score 22 loci. Only loci Aat-2, Est-3 and Mdh-C showed polymorphism. The two samples differed in allele frequencies at the three polymorphic loci. The average expected heterozygosity for all loci was... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Allozymes; Fish genetics; Genetic distance; Polymorphism; Loricariidae; Pisces. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200034 |
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| Chaves, P; Bouchereau, Jl. |
| The Bay of Guaratuba, whose area is approximately 45 km(2), is a basin, situated to the south of Brazil (25 degrees 52' S; 48 degrees 39' W) and connected to the Atlantic ocean. In its northern part, a region of mangrove is found, under the influence of seasonal fluvial contributions, dominated by Laguncularia racemosa. The depth exceeds 6 m in some places. According to the period of the year, salinity varies between 3 and 37, and temperature between 15 and 28 degrees C. Several of the present fish species are exploited by commercial and recreational fisheries. This work describes characteristics of the fish populations occupying this mangrove, and temporal and spatial evolution of populations of the main species from available data on their biology.... |
| Tipo: Text |
Palavras-chave: Pisces; Organisation; Domaine paralique; Mangrove; Atlantique ouest; Pisces; Organisation; Paralic realm; Mangrove; Western Atlantic. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43615/43917.pdf |
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| Laubier, Lucien; Reyss, Daniel. |
| Ces journées ont permis de préciser les résultats scientifiques obtenus par des années d'efforts poursuivis avec ténacité. Dès sa création en effet, le CNEXO s'est efforcé de susciter la constitution d'équipes de recherches spécialement consacrées à l'aquaculture ; il s'est attaché, en tant que coordonnateur national, à réorienter les programmes d'un certain nombre de laboratoires vers des travaux liés à l'aquaculture, en particulier des études sur la reproduction et la nutrition des animaux marins ; il s'est préoccupé de former le personnel sans lequel cette orientation nouvelle et les expérimentations "sur le terrain" auraient été vides de sens. Des bourses de spécialisation ont été attribuées à des chercheurs et à des techniciens qui ont notamment été... |
| Tipo: Text |
Palavras-chave: Aquaculture; Reproduction; Nutrition; Mollusca; Crustacea; Pisces; Croissance organisme. |
| Ano: 1974 |
URL: http://archimer.ifremer.fr/doc/00173/28433/26766.pdf |
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| Le Guen, J.c; Morizur, Yvon. |
| Length measurements on Pseudotolithus elongatus ' samples from the Congo were recorded in the 60s. Subsamples were collected in order to be "aged" by otoliths' reading. The size frequency distributions were splitted into successive unimodal distributions by different methods. Their results were compared. The results obtained from the "successive maximums' method" were similar to those from the "otoliths' reading." The programs NORMSEP and MIX gave results far more difficult to interpret biologically speaking in spite of their mathematical quality. Because many length frequency distributions of a cohort are symmetrical in nature, we suggest applying the "successive maximums' method"if there is no evidence of normality |
| Tipo: Text |
Palavras-chave: Frequency analysis; Size distribution; Pseudotolithus elongatus; Sciaenidae; Pisces. |
| Ano: 1989 |
URL: http://archimer.ifremer.fr/doc/1989/rapport-2336.pdf |
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| This work, divided in three parts, intends to establish a synthesis of knowledge about electric sea fishing. Taxis and tetanus thresholds for stimuli. In the second part, fish behaviour in electric field is described to know what sort of stimuli are the most efficient. The third part shows a fishing gear with light, electric field and pump and sums up the results of I.S.T.P.M. studies. Different problems are discussed and theoretical efficiency of the device is evaluated for sardines, Sardina pilchardus. At last, foreign studies about electric beam trawl are approached in an annex part. |
| Tipo: Text |
Palavras-chave: Pisces; Pump fishing; Electrified gear; Electric stimuli; Electric fishing. |
| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/1980/publication-1936.pdf |
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| Sarano, F. |
| The present work analyses and describes Merluccius merluccius ovarian cycle in the Bay of Biscay as an example of partial spawner. Three methods were employed: a macroscopic examination of about 10,000 ovaries -- a cytologic and histologic study -- an investigation of the size structure of the oocytes population of 63 ovaries. The author developed an original mathematical method for serial spawning demonstration. He demonstrates that hake is a partial spawner: a female usually rapidly spawns 4 or 5 times without ovaries rest. On this basis, he gives a new reference scale of the maturity stages of the ovarian cycle: after developing (II), ripe (III), running (IV), the partly spent ovary is named (II+); the repetitive sequence III-IV-II + characterize serial... |
| Tipo: Text |
Palavras-chave: Pisces; Animal reproductive organs; Spawning; Ovaries; Sexual reproduction. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/publication-1790.pdf |
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| Daget, J.. |
| The author explains that the population dynamics study, descriptive and explicative way, the changes which happen in the structure and the parameters (growth rate, sex ratio, fecundity, mortality etc.) of a monospecific population, by the use of mathematical models which permit prediction and simulation. If the fish population is not exploited, it is necessary to sample it directly and obtain samples representative of the demographical structure by experimental fishing (like electrical fishing) or by selectivity corrections. If the population is exploited, often the exploited phasis of the stock is only studied from samples representative of the whole captures. Now it happens that there is an important difference between the demographical structure of the... |
| Tipo: Text |
Palavras-chave: Pisces; Catch statistics; Mathematical models; Population dynamics. |
| Ano: 1976 |
URL: http://archimer.ifremer.fr/doc/1976/publication-1999.pdf |
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| González,Leo W.; Eslava,Nora; Silva,Carlos. |
| Se determinó la edad y se estimaron los parámetros de crecimiento y mortalidad del pargo colorado, Lutjanus purpureas Poey, 1867, con base en la lectura de 152 urohiales de 1561 individuos capturados durante 1988 de la región de Guayanas, comprendida entre los 06° - 10° LN y 54° - 61° LW, mediante la pesca exploratoria del B/l "Dr. Fridtjof Nansen". El recuento de zonas anuales en urohiales permitió establecer siete grupos de edad. La curva teórica de crecimiento en longitud se ajustó de acuerdo con los valores de los parámetros de crecimiento de von Bertalanffy: L∞ = 91.99 cm; K = 0.245 por año; t o = - 0.499 año. La mortalidad natural obtenida a través de la ecuación de Taylor fue igual a 0.255 por año y la mortalidad total calculada mediante el método... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Edad; Crecimiento; Mortalidad; Pisces; Guayanas. |
| Ano: 1998 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97611998000100001 |
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| Registros recuperados: 79 | |
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