Locomotion and behavior of Humboldt squid, Dosidicus gigas, in relation to natural hypoxia in the Gulf of California, Mexico

2012 ◽  
Vol 215 (18) ◽  
pp. 3175-3190 ◽  
Author(s):  
W. F. Gilly ◽  
L. D. Zeidberg ◽  
J. A. T. Booth ◽  
J. S. Stewart ◽  
G. Marshall ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Dosidicus Gigas ◽  
Humboldt Squid ◽  
And Behavior

Natural egg mass deposition by the Humboldt squid (Dosidicus gigas) in the Gulf of California and characteristics of hatchlings and paralarvae

2008 ◽  
Vol 88 (4) ◽  
pp. 759-770 ◽  
Author(s):  
Danna J. Staaf ◽  
Susana Camarillo-Coop ◽  
Steven H.D. Haddock ◽  
Al C. Nyack ◽  
John Payne ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Egg Mass ◽  
Dosidicus Gigas ◽  
Microbial Infection ◽  
Potential Fecundity ◽  
Egg Masses ◽  
In Captivity ◽  
In The Wild ◽  
Proboscis Extension ◽  
Humboldt Squid

The jumbo or Humboldt squid, Dosidicus gigas, is an important fisheries resource and a significant participant in regional ecologies as both predator and prey. It is the largest species in the oceanic squid family Ommastrephidae and has the largest known potential fecundity of any cephalopod, yet little is understood about its reproductive biology. We report the first discovery of a naturally deposited egg mass of Dosidicus gigas, as well as the first spawning of eggs in captivity. The egg mass was found in warm water (25–27°C) at a depth of 16 m and was far larger than the egg masses of any squid species previously reported. Eggs were embedded in a watery, gelatinous matrix and were individually surrounded by a unique envelope external to the chorion. This envelope was present in both wild and captive-spawned egg masses, but it was not present in artificially fertilized eggs. The wild egg mass appeared to be resistant to microbial infection, unlike the incomplete and damaged egg masses spawned in captivity, suggesting that the intact egg mass protects the eggs within. Chorion expansion was also more extensive in the wild egg mass. Hatchling behaviours included proboscis extension, chromatophore activity, and a range of swimming speeds that may allow them to exercise some control over their distribution in the wild.

scholarly journals Natural egg mass deposition by the Humboldt squid (Dosidicus gigas) in the Gulf of California and characteristics of hatchlings and paralarvae – ERRATUM

2016 ◽  
Vol 97 (2) ◽  
pp. 257-257 ◽  
Author(s):  
Danna J. Staaf ◽  
Susana Camarillo-Coop ◽  
Steven H.D. Haddock ◽  
Al C. Nyack ◽  
John Payne ◽  
...  
Keyword(s):  
Gulf Of California ◽  
Egg Mass ◽  
Dosidicus Gigas ◽  
Humboldt Squid

scholarly journals Chromogenic behaviors of the Humboldt squid (Dosidicus gigas) studied in situ with an animal-borne video package

2015 ◽  
Vol 218 (2) ◽  
pp. 265-275 ◽  
Author(s):  
H. Rosen ◽  
W. Gilly ◽  
L. Bell ◽  
K. Abernathy ◽  
G. Marshall
Keyword(s):  
Dosidicus Gigas ◽  
Humboldt Squid

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.

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