Spatial and trophic preferences of jumbo squid Dosidicus gigas (D'Orbigny, 1835) in the central Gulf of California: ecological inferences using stable isotopes

2018 ◽  
Vol 32 (15) ◽  
pp. 1225-1236 ◽  
Author(s):  
L.D. Trasviña-Carrillo ◽  
A. Hernández-Herrera ◽  
Y.E. Torres-Rojas ◽  
F. Galván-Magaña ◽  
A. Sánchez-González ◽  
...  
Keyword(s):  
Stable Isotopes ◽  
Gulf Of California ◽  
Dosidicus Gigas ◽  
Jumbo Squid ◽  
Trophic Preferences

scholarly journals DISTRIBUCIÓN DE TALLAS Y CONDICIÓN REPRODUCTIVA DEL CALAMAR GIGANTE Dosidicus gigas (D´ORBIGNY, 1835) EN EL GOLFO DE CALIFORNIA

2010 ◽  
Vol 25 (2) ◽  
pp. 103
Author(s):  
J. I. Velázquez-Abunader ◽  
M. O. Nevárez-Martínez ◽  
A. Hernández-Herrera
Keyword(s):  
Frequency Distribution ◽  
Gulf Of California ◽  
Multinomial Distribution ◽  
Reproductive Status ◽  
Distribution Analysis ◽  
Dosidicus Gigas ◽  
Reproductive Condition ◽  
Size Frequency Distribution ◽  
Jumbo Squid ◽  
Size Frequency

Se analizaron cambios en la distribución de tallas, número de cohortes y condición reproductiva del calamar gigante Dosidicus gigas utilizando muestras provenientes de siete cruceros oceanográficos de investigación, efectuados en la región central del Golfo de California, México de 1997 a 2008. En todas las estaciones se muestrearon hasta 25 ejemplares registrando longitud del manto, sexo y fase de madurez gonádica y cuando la captura lo permitió, se realizó un muestreo masivo de 100 ejemplares a los cuales se les midió la longitud de manto. Se definieron hasta tres grupos modales o cohortes en algunos de los meses estudiados a través de la técnica de distribución multinomial. De acuerdo con las fases de madurez se observó una amplia temporada de reproducción con dos picos importantes a lo largo del año que coincidieron con las posibles fechas de nacimiento estimadas para las tallas promedio por cada cohorte de acuerdo a la ecuación de edad-longitud usada en el presente estudio (abril – agosto y octubre - febrero). Se estimó la talla promedio de primera madurez por sexo a través de modelos logísticos; los machos maduran a tallas más pequeñas que las hembras aunque no se encontraron diferencias significativas entre las tallas promedio de madurez por sexo (P > 0.05). Los resultados apoyan la hipótesis de la existencia de múltiples cohortes de calamar gigante en el Golfo de California, dos periodos de eclosión importantes y el número de cohortes presenta variación interanual. Esto sugiere la necesidad de un monitoreo constante del recurso para un mejor manejo de la pesquería. Size distribution and reproductive condition of the jumbo squid Dosidicus gigas (D´Orbigny, 1835) in the Gulf of California Variations in size frequency distribution, number of cohorts, and reproductive status of the jumbo squid Dosidicus gigas were analyzed in samples from seven research oceanographic cruises in the central region of the Gulf of California, Mexico from 1997 to 2008. In each station we recorded sex, gonadic phase and mantle lenght for up to 25 squids. When possible, mantle length was measured for 100 squids. We defined up to three modal groups or cohorts for several months through a multinomial distribution analysis. According to the reproductive status, squids showed a long breeding season throughout the year with two major peaks that match the birth dates estimated by the age-length chart (April to August and October to February). The size at first maturity was estimated by genders; although males were mature at a smaller size than females, no significant differences between were detected. Our results suggest that size frequency distribution and reproductive condition of jumbo squid support the hypothesis of the presence of multiple cohort in the Gulf of California, two important periods of birth, and the number of cohort’s present variation, suggesting the need for a constant monitoring of the resource for a better management of the fishery.

Presence of Dosidicus gigas paralarvae (Cephalopoda: Ommastrephidae) in the central Gulf of California, Mexico related to oceanographic conditions

2010 ◽  
Vol 91 (4) ◽  
pp. 807-814 ◽  
Author(s):  
Susana Camarillo-Coop ◽  
César A. Salinas-Zavala ◽  
Marlenne Manzano-Sarabia ◽  
Eugenio Alberto Aragón-Noriega
Keyword(s):  
Gulf Of California ◽  
Mantle Length ◽  
Dosidicus Gigas ◽  
Potential Fecundity ◽  
San Pedro ◽  
Jumbo Squid ◽  
Ecological Importance ◽  
Santa Rosalia ◽  
First Time ◽  
The Relationship

The jumbo squid Dosidicus gigas is the only ommastrephid commercially caught in Mexico. Despite the economic and ecological importance of this species, little is known about its early life stages. The relationship between the presence of paralarvae and mesoscale oceanic features was investigated for the first time in the central Gulf of California, Mexico in February, April, June and September of 2008. A total of 86 paralarvae were found only in June and September (summer season), in the well-stratified column water where the thermocline was evident and warm sea surface waters (27.7° to 29.4°C) dominated. The greatest abundance of D. gigas paralarvae was observed within 2.23 to 3.48 km of the main front. The mantle length of the smallest paralarvae corresponded with the mantle length at hatching. The San Pedro Mártir Island–Santa Rosalia transect and Santa Rosalia–Guaymas transect were determined as the main hatching localities in June and September respectively. The number of paralarvae found in this study contrast with the potential fecundity of mature females which are found throughout the year.

Isolation and properties of 5′-nucleotidase isolated from jumbo squid (Dosidicus gigas) mantle muscle from the Gulf of California, Mexico

2009 ◽  
Vol 112 (4) ◽  
pp. 880-884 ◽  
Author(s):  
R. Pacheco-Aguilar ◽  
J.C. Ramirez-Suarez ◽  
F.J. Castillo-Yañez ◽  
E.A. Peña-Ramos ◽  
E.M. Valenzuela-Soto ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Dosidicus Gigas ◽  
Jumbo Squid

Stable isotopes in jumbo squid (Dosidicus gigas) beaks to estimate its trophic position: comparison between stomach contents and stable isotopes

2006 ◽  
Vol 86 (2) ◽  
pp. 437-445 ◽  
Author(s):  
R.I. Ruiz-Cooley ◽  
Unai Markaida ◽  
D. Gendron ◽  
S. Aguíñiga
Keyword(s):  
Stable Isotopes ◽  
Stable Isotope ◽  
Trophic Position ◽  
Stomach Contents ◽  
Isotope Ratios ◽  
Trophic Relationships ◽  
Dosidicus Gigas ◽  
Jumbo Squid ◽  
C And N ◽  
Biomass Increase

Stomach contents and carbon (C) and nitrogen (N) stable isotope analysis were used to evaluate trophic relationships of jumbo squid, Dosidicus gigas. Buccal masses, beaks and stomach contents of large and medium maturing-sized jumbo squid and muscle from its main prey, the myctophid Benthosema panamense, were collected in the Gulf of California, Mexico during 1996, 1997 and 1999. Both the quantified C and N-isotope ratios in muscle, and stomach content analysis revealed that larger-sized maturing squid showed a higher trophic position than medium-sized individuals. However, a discrepancy between stomach contents versus stable isotope analyses was found in evaluating trophic relationships. Simple dilution models as a function of growth were used to estimate the C and N renewal dietary shift for jumbo squid. Estimates of the initial C and N pools in D. gigas with an initial age of 70 days and 210 days indicated isotopic shifts of 32% after a threefold biomass increase and 25% after a fourfold biomass increase, respectively. Additionally, beak samples of jumbo squid were evaluated as an alternative tissue to estimate squid trophic position using stable isotopes. The results showed a significant correlation between stable isotope ratios from muscle and beak samples. Muscle isotope values were higher than beak by 1% and 4% for δ13C and δ15N respectively. A test with jumbo squid beaks collected from a stomach of a stranded sperm whale confirmed the viability of this method.

Biomass and distribution of the jumbo squid (Dosidicus gigas; d’Orbigny, 1835) in the Gulf of California, Mexico

2000 ◽  
Vol 49 (2) ◽  
pp. 129-140 ◽  
Author(s):  
Manuel O Nevárez-Martı́nez ◽  
Agustı́n Hernández-Herrera ◽  
Enrique Morales-Bojórquez ◽  
Alejandro Balmori-Ramı́rez ◽  
Miguel A Cisneros-Mata ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Dosidicus Gigas ◽  
Jumbo Squid

Spawning by jumbo squid Dosidicus gigas in San Pedro Mártir Basin, Gulf of California, Mexico

2006 ◽  
Vol 313 ◽  
pp. 125-133 ◽  
Author(s):  
WF Gilly ◽  
CA Elliger ◽  
CA Salinas ◽  
S Camarilla-Coop ◽  
G Bazzino ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Dosidicus Gigas ◽  
San Pedro ◽  
Jumbo Squid

Ontogenetic shifts in trophic geography of jumbo squid, Dosidicus gigas, inferred from stable isotopes in eye lens

2020 ◽  
Vol 226 ◽  
pp. 105507
Author(s):  
Bi Lin Liu ◽  
Wei Xu ◽  
Xin Jun Chen ◽  
Meng Yao Huan ◽  
Na Liu
Keyword(s):  
Stable Isotopes ◽  
Eye Lens ◽  
Dosidicus Gigas ◽  
Ontogenetic Shifts ◽  
Jumbo Squid

scholarly journals Growth model selection for the jumbo squid Dosidicus gigas from the Gulf of California, Mexico

2014 ◽  
Vol 21 (3) ◽  
pp. 231-247 ◽  
Author(s):  
VY Zepeda-Benitez ◽  
E Morales-Bojórquez ◽  
J López-Martínez ◽  
A Hernández-Herrera
Keyword(s):  
Model Selection ◽  
Growth Model ◽  
Gulf Of California ◽  
Dosidicus Gigas ◽  
Jumbo Squid ◽  
Selection For
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