The present study aimed to understand the population dynamics of Mexican barred snapper Hoplopagrus guentherii in Santa Rosalía, Gulf California. This species is among most economically important resources artisanal fisheries. size structure ranged from 28 cm (female) 69 (male) total length. weight-length relationship expressed with equation W = a × Ltb for all specimens and by sex indicated isometric growth. There was greater number females than males. gonadosomatic index showed two...

Reproductive aspects (spawning season, size and weight at maturity, fecundity) of Octopus hubbsorum are reported for Espíritu Santo Island, southern Gulf California (Mexico). A total 230 octopuses were captured (46% females 54% males) between June 2006 2007. The sex ratio was not significantly different from 1:1 (P > than 0.05) except in November, when more males females. Four sexual maturity stages established both sexes: immature, maturing, mature, prespawning (for females) or spawning...

Resumen.-Se estableció el ciclo reproductivo del pargo lunarejo Lutjanus guttatus, un pez de gran importancia comercial.Los organismos se recolectaron mensualmente desde febrero 1993 a diciembre 1994.La proporción sexos poblacional fue 1M:0.96Hy no encontró una diferencia significativa (P≤0,05) la esperada 1:1.Las gónadas analizaron histológicamente y describieron las fases desarrollo gonadal.L. guttatus presenta asincrónico es desovador parcial.La actividad reproductiva estuvo presente todo...

The monthly variation in the biochemical composition of digestive gland, adductor muscle and gonad its relationship with gonadal index (GI) were studied during 2 years a wild population Hyotissa hyotis living Gulf California. Protein was main constituent gonad, gland muscle. Temperature (20°C to 24°C) favored accumulation protein gametogenesis. Carbohydrates lipids stored spring gametogenesis support reproduction effort. Three spawning periods detected, one first year two second.

The reproductive cycle of the scallop Argopecten circularis, an important resource fisheries in Baja California Sur, was studied relation to exogenous factors such as temperature and photoperiod Bahía Concepción. Monthly samples adult specimens were used, biometric data for shell soft body parts recorded. gonads analysed histologically five phases gonadal maturation described. This species confirmed be functionally hermaphroditic, with a pattern characterized by period maximum activity from...

The reproductive cycle of Anadara tuberculosa (Sowerby, 1833) and its relationship with temperature food availability in Magdalena Bay, Mexico was studied.Twenty five adult specimens were collected, on a monthly basis, between January 1998 February 1999.Gonads processed by routinary histology.The divided stages: resting, developing, ripe, spawning spent.The developing stage found within the interval March-October December 1998, also 1999.Spawning observed intervals: January-April...

The annual reproductive cycle of the squalid callista Megapitaria squalida living in Ojo de Liebre lagoon was analyzed from January to December 2001. activity qualitatively (through histological analysis), defining five gonad development stages (undifferentiated, developing, ripe, spawning and spent). A quantitative analysis also conducted gonadic index oocyte diameter) correlate with water temperature salinity. Male female gonads developed spawned parallel through time. M. displays a...

Taxonomic distinction is a measure of diversity that has number advantages provides relevant connotation to theoretical and applied ecology. The usefulness this type as an alternative method for assessing the biodiversity soft-bottom benthic marine ecosystems was tested using indices average taxonomic distinctness (Delta+) variation in (Lambda+) mollusk communities Gulf Batabanó (Cuba). For purpose, inventories soft bottom species obtained period 1981-1985 years 2004/2007 were used. Both...

Hyotissa hyotis specimens were collected at Espíritu Santo Island, Gulf of California, from March 1998 to 1999. Water temperature was recorded, gut-content samples obtained, phytoplankton abundance estimated, and the reproductive status inferred through gonadic index. Gut content included phytoplankton, mostly diatoms (86.5%) dinoflagellates (13.5%). The highest frequency in gut contents occurred May, along with a growing seawater, matching period gonad development seasonal rise temperature....

The fecundity and sex ratio of P. inflatus were studied in the western coast Gulf California, Mexico.From February 2004 to January 2005, 567 lobsters captured, 302 males (M) 265 females (F).The was 1H:1.13M which did not differ significantly from 1:1.Fecundity varied between 94,837 830,149 eggs (384,314 ± 162,147, mean SD, n = 97).On average, relative 952 222 g -1 .The Index Reproductive Potential (IRP) showed that with cephalotorax length (CL) smaller than 80 mm contributed 10.82% eggs'...

The reproductive season and first-maturity size of the blue lobster Panulirus inflatus were determined at “Bahía de Loreto” National Park, Gulf California. Two hundred fifty-six females analyzed, finding that onset gamete development took place in February. incubation started April ended November. highest percentage ovigerous was observed October (88.9%). Histological analysis gonads revealed two peaks gonad maturity, May (75%) August (75%). Temperature positively correlated to percent (rs =...

Changes in biochemical composition of adductor muscle, gonad, and digestive gland Hyotissa hyotis, their relationship to reproduction were studied during the events La Niña (1998-1999) El Niño (1997-1998).In last event, muscle was main storage organ protein carbohydrates.Lipids mainly stored gonad gland.Although proteins highest concentrated substrate three organs studied, they not utilized reproduction; therefore accumulate maturity values occur at spawning August.Changes carbohydrates...

Se capturaron un total de 23 hembras ovigeras jaiba en el estero El Conchalito, Ensenada La Paz, Baja California Sur, las cuales 37.5 % (ocho hembras) pertenecen a Callinectes arcuatus y 62.5 (15 C. bellicosus . registro ancho del caparazon peso cada especimen. estimacion la fecundidad se realizo por medio metodo gravimetrico. promedio para fue 4 094 171 ± 1 796 huevos hembra con una talla 107.0 14.3 mm caparazon, mientras que 576 258 974 112.8 5.5 caparazon. relativa 37 132 5 162 g -1 peso,...

The intestinal content of 30 specimens Anadara tuberculosa collected from the Pacific coast Baja California Peninsula in April, May, June and October 2000 histological sections intestine stomach were made; I know they found 1002 structures. Of these, 917 corresponded to diatoms (91.5%), which, benthic diatom Paralia sulcata (45.3%) planktonic Thalassiosira spp. (42.9%) Thalassionema nitzschioides (2.7%) most frequent. silicoflagellate Dictyocha sp. (1.6%) it was not very abundant. Likewise,...

This study estimated the population density of Spondylus limbatus at six fishing banks that are representative Gulf California, Mexico. Each bank was identified in July 2011. There were significant differences between banks, and a steady north-to-south decrease fitted to potential model. At low densities, S. showed lower variability size. Since densities suitable for commercial exploitation, sustainable extraction can be performed under recovery approach. Also, this represents baseline...