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Manzanillo, Mexico

Solano-Fernandez M.,University of the Sea | Montoya-Marquez J.A.,University of the Sea | Gallardo-Cabello M.,National Autonomous University of Mexico | Espino-Barr E.,INAPESCA
Revista de Biologia Marina y Oceanografia | Year: 2015

Daily growth increments were analyzed in otoliths of Dolphinfish (Coryphaena hippurus) in the coasts of Oaxaca and Chiapas, on the central Mexican Pacific, from September 2004 to September 2005. Results showed that it is possible to count daily growth rings in the sagittae, mainly on the pararostrum zone. Seasonal growth rings were not detected, that is, longer than daily periodicity. We consider that this method is ideal to identify daily growth rings in young organisms. As specimen age and the amplitude of the growth rings diminish, these rings can be underestimated because they appear to overlap. The Gompertz growth model best described the first growth phase (L0= 7.02, G= 3.04, g= 2.89), and the von Bertalanffy constants were: L∞= 231.65 cm, Wc ∞= 77.926 kg, K= 0.874, t0= 0.074. The longevity was estimated at 3.44 years. Sexual dimorphism results in differences in the weight-length relationship and the relative condition factor with males (W= 2.154 · 10-5 · L2.788, CFr= 1.04) having higher values than females (W= 4.608 · 10-5 · L2.586, CFr= 0.96), due to the presence of the bony crest in males. © 2015, Universidad de Valparaiso. All rights reserved. Source


Espino-Barr E.,INAPESCA | Gallardo-Cabello M.,National Autonomous University of Mexico | Cabral-Solis E.G.,INAPESCA | Puente-Gomez M.,INAPESCA | Garcia-Boa A.,INAPESCA
Journal of Fisheries and Aquatic Science | Year: 2014

This study analyzes for the first time age and growth of Gerres cinereus in the coasts of central Mexican Pacific. From April 2010 to November 2011, morphometric data of 427 yellowfin mojarra Gerres cinereus were obtained; otoliths and weights of 179 specimens were used to determine age and growth. The growth study entailed two methods: Length frequency analysis and study of sagittae and asterisci otoliths. Both methods identified seven age groups. Growth parameters of von Bertalanffy's equation were determined by Ford-Walford and Gulland methods and an iteration adjustment Solver. Both techniques yielded a high determination coefficient but the Solver method had the better fit: L∞= 56.43 cm, K = 0.208, to= -0.669. Mean size for each age was: Age 1 = 16.57 cm, age 2 = 24.07 cm, age 3 = 30.15 cm, age 4 = 35.09 cm, age 5 = 39.11 cm, age 6 = 42.36 cm and age 7 = 45.01 cm. The allometric index from the weight-length relationship was positive and b = 3.193, the longevity was of 13.73 years. Higher values of L∞ and smaller of K index were found for specimens of G. cinereus in the coasts of Quintana Roo, Mexico and Biscayne Bay in Florida. © 2014 Academic Journals Inc. Source


Gallardo-Cabello M.,National Autonomous University of Mexico | Espino-Barr E.,INAPESCA | Nava-Ortega R.A.,Instituto Nacional Of Pesca | Garcia-Boa A.,INAPESCA | And 2 more authors.
Journal of Fisheries and Aquatic Science | Year: 2011

Age offish is an important parameter for fisheries assessment; therefore, it was determined for Pacific sierra Scomberomorus sierra by morphological and morphometric analysis of otoliths sagitta, asteriscus and lapillus. Identification of growth rings was also done in the sagittae and asterisci; five growth rings were found: the first ring was formed when the fish measured 19.20 cm, the second at 35.14 cm, the third at 45.80 cm, the fourth at 56.20 cm and the fifth at 64.51 cm of total length. The relationship between length and width of the sagittae is expressed by the equations: y = 0.582 x° 773 (rostrum-antirostrum) and y = 0.372 x0640 (rostrum-width). In the case of the asterisci: y = 0.248 x 0685 (length-width). For the lapilh y = 0.488 x0760 (length-width). Growth of these otoliths was also related to the length of the fish. Differences between sexes were observed. Females presented larger sized otoliths than males from 10 to 40 cm of length; once the gonadic maturity begins, this growth diminishes and males present a larger growth in these structures. © 2011 Academic Journals Inc. Source


Morphology, morphometry and growth rings of the otoliths: sagitta, asteriscus and lapillus of Diapterus brevirostris from Cuyutlán Lagoon in Colima, Mexico were studied. The samples were obtained from the commercial catch from April 2010 to July 2012. Right and left and sex differences of the three pairs of otoliths were analyzed. Relations between total length of the fish and length and width of the otolith showed that these structures can be used to determine age in fish. Growth in otoliths is eccentric according to the core in all cases. Six growth rings were identified in sagittae and asterisci. These marks could not be seen in lapilli because of the thickness of this structure. Growth of sagittae and lapilli is faster in males than females of 160 to 320 mm total length. Nonetheless, it was observed that growth in asterisci is faster in females than in males of 160 to 320 mm. Source


Nava-Ortega R.A.,Instituto Nacional Of Pesca | Espino-Barr E.,INAPESCA | Gallardo-Cabello M.,National Autonomous University of Mexico | Garcia-Boa A.,INAPESCA | And 2 more authors.
Revista de Biologia Marina y Oceanografia | Year: 2012

The artisanal fishery of sierra Scomberomorus sierra along the coast of Colima represents 1% of the total catch. From January 2003 to March 2004 morphometric data of 972 organisms and otoliths of 464 specimens were obtained to determine age and growth. Growth study was carried out by two methods: length frequency analysis and study of sagittae and asterisci otoliths. Both methods identified 5 age groups. Growth parameters of von Bertalanffy's equation were determined by Ford-Walford and Gulland methods and an iteration adjustment, both techniques showed a high determination coefficient, but the second was better between observed and calculated values according to the sum of squared error; the results obtained were: L∞ = 99.54 cm, K = 0.205, to= -0.060. Mean size for each age was: age 0 (less than one) = 1.22 cm, age 1 = 19.47 cm, age 2 = 34.33 cm, age 3 = 46.43 cm, age 4 = 56.29 cm and age 5 = 64.32 cm. Comparisons for this species were made with results from 20 years ago in the same area, using coincident curves test, showing a significant reduction in average length of each age; this may be caused by changes in the fishery or overexploitation, although growth parameters show the opposite trend. S. sierra has a lower L∞ in Manzanillo than in Mazatlan, which could be explained by climatic, latitudinal differences or due to population's genetic variations. The allometric index from the weight-length relationship was isometric, 3.031 and longevity of 15 years. Source

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