Growth Curve of the Crustose Lichen Ochrolechia parella Obtained from Marginal Growth Rings

Age and growth parameters of cachara Pseudoplatystoma reticulatum (Eigenmann & Eigenmann, 1889) (Siluriformes, Pimelodidae) (males and females) were estimated through the analysis of growth rings in spines of pectoral fins. Fish were collected from January to December 2007, in the area directly influenced by the Aproveitamento Múltiplo de Manso (APM Manso) and in the Cuiabá River (upper parts of the Pantanal). The maximum number of growth rings was seven for males, and eight, for females. The analysis of temporal variations in mean marginal increment showed that rings found in the spines were formed annually, in December. Growth rings were associated to spawning (in the study region from November to March) of the species. The growth curve in length was obtained by the von Bertalanffy model adjusted by the Ford-Walford transformation. The equations are: Ls = 72.7*[1-e-0.44(t+1.5974)] for males, and Ls = 84.5*[1-e-0.33(t+2.0943)] for females. The equations that describe the growth curve in weight are: Wt = 4991.61*[1-e-0.44 (t+1.5974] 2.70 for males and Wt = 7503.17*[1-e-0.33 (t+2.0943] 2.99 for females.

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Annual Growth Rings and Rate of Growth of the Giant Scallop, Placopecten magellanicus (Gmelin) in the Digby Area of the Bay of Fundy

Journal of the Fisheries Research Board of Canada ◽

10.1139/f54-042 ◽

1954 ◽

Vol 11 (5) ◽

pp. 660-671 ◽

Cited By ~ 25

Author(s):

J. A. Stevenson ◽

L. M. Dickie

Keyword(s):

Growth Curve ◽

Growth Ring ◽

Annual Growth ◽

Bay Of Fundy ◽

Placopecten Magellanicus ◽

Growth Rings ◽

Rate Of Growth ◽

Special Collections ◽

General Growth ◽

Annual Growth Rings

The growth rings on the valves of scallops collected from the Digby area of the Bay of Fundy are formed only once a year during the winter. Observations of special collections of small scallops have also shown the position of the first growth ring. This information has been used to construct a general growth curve from measurements of annuli on scallops from the Digby area.

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Age and growth of the Duckbill Catfish (Sorubim cf. lima) in the Pantanal

Brazilian Journal of Biology ◽

10.1590/s1519-69842004000100014 ◽

2004 ◽

Vol 64 (1) ◽

pp. 125-134 ◽

Cited By ~ 10

Author(s):

J. M. F. Penha ◽

L. A. F. Mateus ◽

G. Barbieri

Keyword(s):

Growth Curve ◽

Nonlinear Regression ◽

Good Predictor ◽

Fork Length ◽

Age And Growth ◽

Type I ◽

South American ◽

Growth Rings ◽

Marginal Increment ◽

Fin Spines

The Duckbill Catfish, Sorubim lima, is a predator of large South American rivers. The age and growth of S. lima were studied based on the pectoral fin-spines of samples collected from the Cuiabá River, Pantanal. The samples were taken from commercial and experimental hook-and-line fishing. An analysis of the marginal increment suggests that the growth rings are formed once a year during the dry season, from July to September (ANOVA type I: F = 4.183; g.l. = 3 and 104; p = 0.008). The estimate of the parameters that describe von Bertalanffy's growth curve by nonlinear regression of the observed lengths in the age were: L<FONT FACE=Symbol>¥</FONT> = 56.0 cm (fork length); k = 0.245 year-1; t o = -2.605 years. The animals were estimated to have a life span of 9.6 years. The findings indicate that the fork length is a good predictor of the age of individuals of this fish species.

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The age and growth of the scallop, Pecten maximus (L.), in Manx waters

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315400025777 ◽

1957 ◽

Vol 36 (3) ◽

pp. 473-492 ◽

Cited By ~ 69

Author(s):

James Mason

Keyword(s):

Shallow Water ◽

Growth Curve ◽

Growth Ring ◽

Great Majority ◽

Annual Growth ◽

Age And Growth ◽

Pecten Maximus ◽

Growth Rings ◽

Annual Growth Ring ◽

Spawning Periods

Growth-rings on the shell of the scallop (Pecten maximus) are laid down annually, in spring, and so can be used to determine the age.Scallops grow from spring to December, and cease growing in winter. The resumption of growth in the spring is marked by the appearance of the annual growth-ring at the edge of the shell.The first year's growth is of one of two types. A few scallops have shells which show a large first year's growth, 28 mm or more wide, while the great majority have shells which show a small first year's growth, less than 28 mm wide. These two types probably depend on the two principal spawning periods of the scallop, most of the former arising from the spring spawning and most of the latter from the autumn one.The growth curve of P. maximus is of a type characteristic of lamellibranch shells. The annual growth is greatest in the first two or three years of life, after which it decreases steadily.Scallops grow more quickly in shallow water than in deeper water.Possible causes of the annual cessation of growth are discussed.A paucity of young scallops was noted in the dredge samples, as previous workers have reported. No reason can be given.

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Age and growth of the porthole shovelnose catfish (Hemisorubim platyrhynchos) in the Pantanal

Brazilian Journal of Biology ◽

10.1590/s1519-69842004000500013 ◽

2004 ◽

Vol 64 (4) ◽

pp. 833-840 ◽

Cited By ~ 10

Author(s):

J. M. F. Penha ◽

L. A. F. Mateus ◽

G. Barbieri

Keyword(s):

Growth Curve ◽

Nonlinear Regression ◽

Growth Ring ◽

Fork Length ◽

Age And Growth ◽

Von Bertalanffy ◽

Growth Rings ◽

Marginal Increment ◽

Fin Spines ◽

Probable Time

The Porthole Shovelnose Catfish, Hemisorubim platyrhynchos, is the sixth largest pimelodidae of the Pantanal. Its age and growth were studied using pectoral fin-spines from fish collected in the Cuiabá river basin, Pantanal. The fish, which came from commercial and experimental fisheries, were all caught with hook and line. Growth-ring formation time could not be defined through the Kruskal-Wallis test on marginal increment (H = 4.142; p = 0.247). Nevertheless, decrease in the marginal increment index occurring as waters recede suggests this as the probable time when growth rings form. Estimation of the parameters of von Bertalanffy growth curve, adjusted through nonlinear regression to observed fork lengths, with L<FONT FACE=Symbol>¥</FONT> fixed at 64 cm, were: k = 0.222 year-1; t o = -2.149 years. Individual life span was estimated at 11.4 years. The results suggest that fork length is a good predictor of age for individuals of this species.

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