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| Registros recuperados: 31 | |
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| FREITAS, A. R. de; ALENCAR, M. M. de; SILVA, A. M.. |
| Tres modelos nao lineares de crescimento: Gompertz, Logistico e Von Bertalanffy, foram ajustados pelo metodo de Gauss Newton a dados peso-idade, do nascimento ate 40 meses de idade, de bovinos da raca Canchim, machos e femeas, nascidos de 1953 a 1975, em Sao Carlos, SP. O objetivo foi estudar o padrao de crescimento de animais Canchim no seu ambiente de origem e discutir caracteristicas destes modelos, para coeficientes de determinacao superiores a 98,0%, exceto o Gompertz que nao convergiu para machos, os demais proporcionaram boa qualidade de ajuste aos pesos observados, para ambos os sexos. |
| Tipo: Separatas |
Palavras-chave: Curvas de crescimento; Modelos Von Bertalanffy; Gompertz; Logistico; Growth curves; Logistic. |
| Ano: 1998 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/44181 |
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| FREITAS, A. R. de; ALENCAR, M. M. de; SILVA, A. M.. |
| Os modelos Gompertz, Logistico e Von Bertalanffy foram ajustados pelo metodo de Gauss Newton a dados peso-idade, do nascimento ate 40 meses de idade, de animais da raca Canchim (femeas e machos). O objetivo foi avaliar a influencia do mes de nascimento (MN) sobre o padrao de nascimento desses animais ate a idade adulta por meio da associacao entre a taxa de crescimento e o peso limite (A). Os modelos proporcionaram coeficientes de determinacao superiores a 98,0%, embora o gompertz nao tenha apresentado convergencia em alguns do MN. O modelo de Von Bertalanffy proporcionou os maiores valores para as estimativas de A e, consequentemente, os menores valores de K. O MN apresentou grande influencia sobre parametros de crescimento dos modelos para ambos os sexos. |
| Tipo: Separatas |
Palavras-chave: Curvas de crescimento; Modelos de Gompertz; Bertalanffy e Logistico; Peso assintotico; Asymptotic weight; Growth curves; Growth rate; Logistic; Von Bertalanffy. |
| Ano: 1998 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/44203 |
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| Aubone, A.; Wöhler, O.C.. |
| With the purpose of easening its application, the theory of parameter estimation by the maximum likelihood method is presented. The theory is general and useful for linear and nonlinear models. The method is applied to the von Bertalanffy´s growth model for individual data and for mean values of length-at-age. Statistical tests to compare parameters from different population groups are presented. Problems caused by lack of verification of assumptions are discussed. An example of its application is given and results of nonlinear least squares estimations are compared to those obtained with Allen´s method. An example of application implemented on a calculus spreadsheet is attached. |
| Tipo: Journal Contribution |
Palavras-chave: Growth curves; Mathematical models; Mathematical models; Http://aims.fao.org/aos/agrovoc/c_24199. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/2541 |
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| The principal biometric relations of juvenile Trachypenaeus similis similis and T. constrictus in Guadeloupe were calculated from 1976 to 1978. The examination of these relations yields few differences between the two species. A growth curve was established according to the sequences of modal values; these were determined according to weekly size frequency distributions over three different periods of time. In the zone studied, the growth of young Trachypenaeus is more rapid than that of the young Penaeus. |
| Tipo: Text |
Palavras-chave: Trachypenaeus; Juveniles; Size distribution; Growth curves; Biometrics. |
| Ano: 1980 |
URL: http://archimer.ifremer.fr/doc/1980/publication-1932.pdf |
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| Hansen, J.E.; Cousseau, M.B.; Gru, D.L.. |
| A total of 7263 otoliths were collected from anchovy samples taken during two pelagic cruises which were carried out in the Spring of 1978. An statistical analysis of back calculated length distributions of one-year-old fish (L1)was made. The L1 mean values taken by geographical latitude form a cline, with higher values in the northern samples, and decreasing Southwards. Within this latitudinal gradient two main anchovy populations can be identified, one in the region of Buenos Aires Province and the other in Patagonian waters. The L1 of the females is significatively larger than that of the males for the former population, whereas in the Patagonian area differences between sexes are not significant. The parameters of the von Bertalanffy Growth curves, as... |
| Tipo: Journal Contribution |
Palavras-chave: Stock identification; Otolith reading; Growth curves; Mortality; Mortality; Http://aims.fao.org/aos/agrovoc/c_4945. |
| Ano: 1984 |
URL: http://hdl.handle.net/1834/2043 |
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| Branco,Joaquim Olinto; Masunari,Setuko. |
| Studies on the growth of the blue crab C. danae were carried out by the analysis of size-frequency distributions, and the growth curves were determined for both sexes through Bertalanffy equation. 613 males and 511 females were obtained from 10 collecting sites of the lagoon, at night, monthly from January/88 to July/89. The growth curves in carapace width were described according to the following equations: Wid∞ = 14.0 (1-e-0,6975.t) for males and Wid∞ = 13.3 (1-e-0,6555.t) for females. The growth curves in body weigth were also determined, based on the equations of the growth curves and the relationship between body weight and carapace width. The equations are:Wt = 156.9 (1-e-0,6975.t)2.9153 for males, Wt = 134.0(1-e-0.6555.t)2.8994 for females. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Callinectes danae; Growth curves; Conceição Lagoon; Florianópolis; Brazil. |
| Ano: 1992 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751992000100008 |
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| Angelescu, V.A.; Anganuzzi, A.. |
| The paper was developed in order to arrange the data gathered on this subject and to generate new hypotheses in connection with the trophic strategy of the northern stock of anchovy in the area between latitudes 35°-42°S. Such estimates were finally compared with the values of the gravimetric determinations of stomach contents- as converted to caloric values - of individuals grouped by total-length amd age classes, ecological areas, and seasons of the year. The set of results as obtained conforms the initial basis for developing Part IV of the Trophic Ecology of the Argentine anchovy as related to food consumption estimates, by stock biomass and annual classes, with back-calculations to age class 0, and for applying "regional patterns" that result from the... |
| Tipo: Journal Contribution |
Palavras-chave: Growth curves; Bioenergetics; Migrations; Length-weight relationships; Condition factor. |
| Ano: 1986 |
URL: http://hdl.handle.net/1834/2022 |
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| Massa, A.M.. |
| The gatuzo, Mustelus schmitti, lives in the Southamerican Atlantic coastal waters from up to 23°S (Brazil)down to 47°S (Argentine), and is the greatest species of the Bonaerense and North Patagonian shores. This species is the most exploited elasmobranch of this region, within the last six years catch has exceeded 10,000 t per year and it is vulnerable to overexploitation due to reproductive aspects, with a low rate of changes, as well as distribution patterns. In order to relate size distribution and nursery areas, and environmental temperature and salinity variability, were obtained within six INIDEP 'Coastal Project' research cruises from 34° to 42°S from boundaries to 50 mts isobaths, during the spring seasons between 1994 to 1997. Cluster analysis... |
| Tipo: Theses and Dissertations |
Palavras-chave: Size distribution; Age composition; Sex ratio; Growth curves; Environmental effects; Brackishwater environment; Age composition; Sex ratio; Brackishwater environment; Http://aims.fao.org/aos/agrovoc/c_29093; Http://aims.fao.org/aos/agrovoc/c_7014; Http://aims.fao.org/aos/agrovoc/c_1050. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/3584 |
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| Cousseau, M.B.; Gru, D.L.. |
| Samples of Sardina fueguina (Sprattus fuegensis)were taken during research cruises carried out in 1974 and 1978. Length and age frequency distributions were analyzed, and von Bertalanffy growth parameters were calculated for the coastal waters of two geographical regions: Province of Santa Cruz and northern part of Malvinas Islands. Lenght and weight growth curves have been calculated for each region and each year. Marked differences have been found between gowth parameters of both regions, and the calculated values showed a good fit with the observed ones. According to these results, it is possible to assume that the sardines of both regions constitute two different populations. However, more information on the total distribution of the species will have... |
| Tipo: Journal Contribution |
Palavras-chave: Age composition; Growth curves; Stock identification; Sardine fisheries; Age composition; Http://aims.fao.org/aos/agrovoc/c_29093. |
| Ano: 1982 |
URL: http://hdl.handle.net/1834/2052 |
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| Registros recuperados: 31 | |
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