Biological indicators for the Pacific sierra (Scomberomorus sierra) fishery in the southern Gulf of California, Mexico

Aguirre‐Villaseñor, Hugo; Morales-Bojórquez, Enrique; Morán-Angulo, RE; Madrid-Vera, Juan; Valdez-Pineda, MC

doi:10.7773/cm.v32i3.1130

Cited by 25 publications

(19 citation statements)

References 5 publications

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“…Multinomial distribution, an extension of a binomial distribution, is applicable in situations where there are more than two possible outcomes from an observation. In this case, the model predicts the relative abundance of each age group (cohort) and these can be combined to produce data on catch at age by the splitting of the size frequency distributions into modal groups (Haddon, 2001;Aguirre-Villaseñor et al, 2006). Based on this modeling, we detected three age groups of Sinaloa cichlids; however, validating these modal groups in future studies by direct methods (otoliths and scales) are necessary before they can be considered as age groups.…”

Section: Discussionmentioning

confidence: 96%

“…Size structure between males and females was assessed with the Kolmogorov-Smirnov test for two independent samples. A modal progression analysis was determined for trends in the monthly size frequencies using a multinomial distribution (Haddon, 2001) described by Aguirre-Villaseñor et al (2006), given by the following probability density function:…”

Section: Population Featuresmentioning

confidence: 99%

“…An important assumption of this technique is that the size distribution and average length can be treated, based on a normal distribution and each mode can be interpreted as a cohort (Fournier et al, 1990;Aguirre-Villaseñor et al, 2006). Accordingly, we assume that p follows a normal distribution in each cohort so the estimates of the expected relative proportions of each modal group were described, based on the following probability density function:…”

Section: Population Featuresmentioning

confidence: 99%

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Population structure and reproductive behavior of Sinaloa cichlid Cichlasoma beani (Jordan, 1889) in a tropical reservoir

et al. 2011

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The population structure and reproductive condition of the Sinaloa cichlid Cichlasoma beani from samples obtained from June 2000 to July 2001 were determined. Samples in the first week each month from the largest trader of tilapia in the Aguamilpa Reservoir in Mexico and were caught in gillnets (9.6 and 11.4 cm stretch-mesh size). Of 596 specimens, there were 427 males and 169 females; monthly sex ratio, frequency of lengths by the multinomial distribution, timing of reproduction, condition index, and size at first maturity was determined. Differences in the sex ratio and monthly totals were significant, favoring males, except for September 2000 and March 2001. From one (August 2000) to three modal groups (July 2000 and June 2001) were identified by size. There were no significant differences in standard length weight relationships by sex, which indicated that a shared model for both genders is appropriate, and isometric growth was detected. Based on the proportion of mature and partially matures fish, the main reproductive period was April through June; size at first maturity was 18.9 cm. Water temperature was not significantly related to the percentage of mature and partially matures Sinaloa cichlids or spawning. These findings provide information for regulating the Cichlasoma beani fishery in this region such minimum legal size and non-fishing period.

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Section: Discussionmentioning

confidence: 96%

Section: Population Featuresmentioning

confidence: 99%

Section: Population Featuresmentioning

confidence: 99%

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Population structure and reproductive behavior of Sinaloa cichlid Cichlasoma beani (Jordan, 1889) in a tropical reservoir

et al. 2011

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“…In this equation, a is the average condition factor and β is the coefficient of allometry; a β value equal to 3 indicates an isometric growth pattern, whereas a value significantly different from 3 denotes allometric growth. Thus, the equation parameters and their 95% confidence intervals (CI) were estimated (Aguirre-Villaseñor et al 2006, Esmaeili and Ebrahimi 2006), and the estimated β was subjected to Student’s t-test (Zar 1999) to determine whether growth was isometric or allometric. As allometric changes are related to the chronology of important life-history events and therefore reflect an ontogenetic response to functional demands, allometric analyses were conducted separately for females, males, both sexes, undifferentiated individuals, and for the entire sample.…”

Section: Methodsmentioning

confidence: 99%

Seagrass Halodule wrightii as a new habitat for the amphioxus Branchiostoma californiense (Cephalochordata, Branchiostomidae) in the southern Gulf of California, Mexico

Campos-Dávila¹,

Pérez-Estrada²,

Rodríguez‐Estrella³

et al. 2019

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The first record of the amphioxus Branchiostoma californiense on seagrass patches of Halodule wrightii in the Gulf of California is reported. Sixty individuals (19 males, 18 females, and 23 undifferentiated) were collected in May 2017 at Bahía Balandra, Gulf of California, from subtidal seagrass patches at a depth of 0.5 m at low tide. The length and weight ranged from 15.88–28.44 mm and from 0.01–0.11 g for females and 11.7–27.9 mm and 0.01–0.09 g for males, respectively. The minimum size of sexually mature individuals was 11.70 mm for males and 15.88 mm for females; 62% of the specimens were sexually mature. Analysis of the total length-weight relationship suggested an allometric growth pattern among females, males and undifferentiated individuals, whereas an analysis of the entire sample suggested an isometric growth pattern. Typical and additional morphological characters were used to identify the amphioxi. High morphological variability between individuals was found, suggesting the presence of several morphotypes. Branchiostoma californiense had been previously reported as exclusively associated with bare sandy areas, but our study shows that this species can also be found in seagrass patches, using them as breeding and feeding grounds. Thus, seagrass patches are evidenced as suitable habitats for amphioxus.

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“…The parameters of the model were estimated when the negative log-likelihood function was minimized with the Newton direct search algorithm (Neter et al 1996). The objective function to be minimized was expressed as follows (Haddon 2001, Aguirre-Villaseñor et al 2006):…”

Section: Size Structurementioning

confidence: 99%

Variation in relative abundance and mean size of the sailfish Istiophorus platypterus caught by the artisanal fleet in the Gulf of Tehuantepec, Mexico

Guevara¹,

Morales-Bojórquez

Ramos-Carrillo³

et al. 2012

Cienc. Mar.

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ABSTRACT. The sailfish Istiophorus platypterus is abundant in tropical coastal areas of the Pacific Ocean. It is targeted by both sport-fishing and commercial (artisanal) fleets in Mexico, Guatemala, Costa Rica, and Panama. The Gulf of Tehuantepec is one of the main areas of abundance of I. platypterus, where it is caught incidentally by artisanal vessels. The objective of this study was to analyze the size structure and the variability in the catch-per-unit-effort (CPUE) of sailfish caught in the Gulf of Tehuantepec from 2000 to 2008. The size structure was analyzed using eye-fork length (EFL) and CPUE was estimated as the number of individuals per fishing trip. Individuals ranged in size from 55 to 240 cm EFL and varied in total weight from 1.6 to 69.7 kg. The size structure was unimodal, and the variability over time showed a negative tendency (F (0.05(1),8,4967) = 6.8E + 8; P < 0.05). The CPUE of I. platypterus showed seasonal changes: values were lower from January to April and higher during the summer, and then decreased again in early winter.Key words: artisanal fishing, Gulf of Tehuantepec, size structure, CPUE, Istiophorus platypterus. RESUMEN. El pez velaIstiophorus platypterus es abundante en zonas costeras tropicales del océano Pacífico. Además de ser atractiva para la pesca deportiva, también sostiene pesquerías artesanales en México, Guatemala, Costa Rica y Panamá. El golfo de Tehuantepec se reconoce como una de las áreas de mayor abundancia de I. platypterus y en la cual se llevan a cabo capturas incidentales en la pesca comercial de pequeña escala. El objetivo del presente trabajo fue determinar la estructura de tallas y la tendencia de la captura por unidad de esfuerzo (CPUE) del pez vela capturado por la flota artesanal en el golfo de Tehuantepec durante 2000 hasta 2008. Se estimó la estructura de tallas con base en el registro de la longitud ojo-furca (LOF) y la CPUE con base en el número de organismos capturados por viaje de pesca. Los individuos presentaron un intervalo de tallas de 55 a 240 cm de LOF y un peso total de 1.6 a 69.7 kg. La estructura de tallas fue unimodal, con una variación anual en la talla promedio de 2000 a 2008, y mostró una tendencia a disminuir en la serie de tiempo (F (0.05(1),8,4967) = 6.8E + 8; P < 0.05). La CPUE de I. platypterus presentó cambios estacionales: los valores más bajos se observaron durante el periodo de enero a abril, luego incrementaron durante el verano y volvieron a decaer hacia diciembre.Palabras clave: pesca artesanal, golfo de Tehuantepec, estructura de tallas, CPUE, Istiophorus platypterus.

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Biological indicators for the Pacific sierra (Scomberomorus sierra) fishery in the southern Gulf of California, Mexico

Cited by 25 publications

References 5 publications

Population structure and reproductive behavior of Sinaloa cichlid Cichlasoma beani (Jordan, 1889) in a tropical reservoir

Population structure and reproductive behavior of Sinaloa cichlid Cichlasoma beani (Jordan, 1889) in a tropical reservoir

Seagrass Halodule wrightii as a new habitat for the amphioxus Branchiostoma californiense (Cephalochordata, Branchiostomidae) in the southern Gulf of California, Mexico

Variation in relative abundance and mean size of the sailfish Istiophorus platypterus caught by the artisanal fleet in the Gulf of Tehuantepec, Mexico

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