Reproductive biology of Eledone moschata (Cephalopoda: Octopodidae) in the Gulf of Cádiz (south-western Spain, ICES Division IXa)

2004 ◽  
Vol 84 (6) ◽  
pp. 1221-1226 ◽  
Author(s):  
Luis Silva ◽  
Fernando Ramos ◽  
Ignacio Sobrino
Keyword(s):  
Reproductive Period ◽  
Female Dominance ◽  
Gulf Of Cadiz ◽  
Annual Life Cycle ◽  
Gulf Of Cádiz ◽  
Mean Size ◽  
The Mean ◽  
Western Spain ◽  
By Catch ◽  
Condition Indices

Reproductive aspects of Eledone moschata from the Spanish waters of the Gulf of Cádiz are reported for the first time. The species is relatively abundant over the continental shelf and it is caught as by-catch by the bottom-trawl fleet. Monthly samplings throughout one annual life-cycle showed a sex ratio with a female dominance (0·45:1). A four stage maturity scale was used for both sexes. The reproductive period was determined from monthly evolution of these stages as well as that of several maturity and condition indices. The breeding season extended from October to June, with spawning peaks in October and March–May, the second one being more important. Length and weight at maturity (mantle length50, body weight50) were estimated at 7·8 cm and 97 g in males, and at 12·2 cm and 274 g in females, respectively. Total fecundity, estimated from 52 mature females, was 443·5±154·4 oocytes on average. The mean size of mature oocytes and the mean length of mature spermatophore in mature females and males was 10·24 mm (±1·07) and 13·88 mm (±1·60), respectively.

scholarly journals Tidal and seasonal carbon and nutrient dynamics of the Guadalquivir estuary and the Bay of Cádiz (SW Iberian Peninsula)

2013 ◽  
Vol 10 (7) ◽  
pp. 4481-4491 ◽  
Author(s):  
M. Ribas-Ribas ◽  
E. Anfuso ◽  
A. Gómez-Parra ◽  
J. M. Forja
Keyword(s):  
Continental Shelf ◽  
Nutrient Dynamics ◽  
Diurnal Changes ◽  
Gulf Of Cadiz ◽  
Mean Velocity ◽  
Guadalquivir Estuary ◽  
Gulf Of Cádiz ◽  
The Mean ◽  
Bay Of Cadiz ◽  
Bay Of Cádiz

Abstract. To study the effects of the physical environment on carbon and nutrient cycle dynamics on the north-eastern shelf of the Gulf of Cádiz, changes in currents, tides, salinity, temperature, carbon system parameters (fugacity of CO2 (fCO2), dissolved organic carbon, dissolved inorganic carbon (DIC) and pH) and other related parameters(dissolved oxygen, total dissolved nitrogen (TDN), nutrients and suspended particulate matter) were measured in transects across the Guadalquivir estuary and Bay of Cádiz mouths. The main objective of this study is to investigate the influence of these inner ecosystems on the carbon and nutrient distributions on the adjacent continental shelf. Three cruises were undertaken in June 2006, November 2006 and February 2007. During the whole study period, Guadalquivir estuary exported components at a rate of 3 Gmol of SiO2, 4 Gmol of DIN, 3 Gmol of TDN, 31 Gmol of DOC and 604 Gmol of DIC per year. On the other hand, Bay of Cádiz imported 3 Gmol of SiO2, 1 Gmol of DIN, 2 Gmol of TDN, 33 Gmol of DOC and 562 Gmol of DIC per year. Diurnal variability of fCO2 could have a potentially important implication on the estimate of air–sea CO2 fluxes. Tides influence velocity and transport of carbon and nutrients: we found statistically significant differences (p < 0.0001, n = 220) between the flood tide (the mean velocity was 4.85 cm s–1) and the ebb tide (the mean velocity was −5.67 cm s–1). Biological activity and diurnal changes have also an important role on the carbon and nutrient dynamics. Seasonal carbon and nutrient variations were found. During June, both systems were exporting components to the adjacent continental shelf of the Gulf of Cádiz, whereas in February both systems were importing. Monthly studies should be undertaken to completely understand this dynamic system.

scholarly journals Testing Nordmøre grids on the target and by-catch species of the commercial bottom trawl fishery in the Gulf of Cadiz

2015 ◽  
Vol 79 (4) ◽  
pp. 465-477 ◽  
Author(s):  
Mariángeles Gamaza ◽  
Ignacio Sobrino ◽  
Karim Erzini
Keyword(s):  
Bottom Trawl ◽  
Gulf Of Cadiz ◽  
Trawl Fishery ◽  
Gulf Of Cádiz ◽  
By Catch

scholarly journals A pesca de tainha e parati na Baía de Guaratuba, Paraná, Brasil

2005 ◽  
Vol 34 ◽  
Author(s):  
JULIANA VENTURA DE PINA ◽  
PAULO DE TARSO CHAVES
Keyword(s):  
Local Market ◽  
Beach Seine ◽  
Bony Fishes ◽  
Mean Size ◽  
The Mean ◽  
By Catch ◽  
South Of Brazil

Três espécies de Mugilidae integram a atividade pesqueira na Baía de Guaratuba – Mugil platanus, M. curema e Mugil sp, sendo outono a estação com maior variedade de artes envolvidas na sua captura. O arrastão de praia mobiliza o maior número de pessoas e é eficiente para as três espécies. Raias e tartarugas, além de peixes ósseos não-Mugilidae, integram a fauna acompanhante das pescarias. Exemplares maduros são registrados no outono (M. platanus e M. curema), e no verão e na primavera (M. curema e Mugil sp). Os exemplares de maior porte são registrados no outono; os menores, na primavera. Entretanto, no mercado local o tamanho médio dos exemplares comercializados é semelhante ao longo do ano, e mesmo no inverno – quando pesca dirigida a mugilídeos não foi observada na região – tainhas e paratis estão disponíveis para venda. Fisheries of mullets at the Guaratuba Bay, Parana, Brazil Abstract In Guaratuba Bay, South of Brazil, fisheries are performed on three mullet species: Mugil platanus, M. curema and Mugil sp., the last of them formerly known as M. gaimardianus. Autumn is the period when a higher number of fish gears is used aiming mullet fisheries. Among these gears, beach seine requests more people than others to be performed. Rays and turtles, as well as bony fishes other than mullets, are registered as by-catch in the fisheries. Mature specimens are caught in autumn (M. platanus and M. curema), and in summer and spring (M. curema and Mugil sp.). The largest specimens are found in autumn; the smallest ones, in spring. However, at the local market the mean size of the specimens does not change along the year. Even in winter, when mullet catches were not registered at the Guaratuba Bay, mullets are available to be sold. Résumé Dans la Baie de Guaratuba, sud du Brésil, trois espèces de Mugilidae font partie de la pêche aux muges: Mugil platanus, M. curema et Mugil sp. Cette dernière a autrefois été connue comme M. gaimardianus. L’automn est la saison quand une plus grande variété d’engins est mise en place. Parmi tous ces engins, la seine de plage est celui qui exige un plus important nombre de personnes. Des raies et des tortues, en plus que poissons d’autres que les muges, sont aussi reconnus lors des coups de pêche. Des individus mûrs sont trouvés en automn (M. platanus et M. curema), ainsi qu’en été (M. curema et Mugil sp.). Les individus à une longueur plus importante sont trouvés en automn; les plus petits, au printemps. Toutefois, au marché local la taille moyenne des exemplaires ne change pas au cours de l’an, et même en hiver – malgré le manque de pêche aux muges observée dans la Baie – des muges sont trouvés étant vendues.

Food-web structure of and fishing impacts on the Gulf of Cadiz ecosystem (South-western Spain)

2013 ◽  
Vol 265 ◽  
pp. 26-44 ◽  
Author(s):  
María Ángeles Torres ◽  
Marta Coll ◽  
Johanna Jacomina Heymans ◽  
Villy Christensen ◽  
Ignacio Sobrino
Keyword(s):  
Food Web ◽  
Gulf Of Cadiz ◽  
Food Web Structure ◽  
Web Structure ◽  
Gulf Of Cádiz ◽  
Western Spain ◽  
Fishing Impacts

Aspects of the Life Histories of Perioculodes Longimanus, Pontocrates Arcticus and Synchelidium Maculatum (Crustacea: Amphipoda) at Millport, Scotland

1998 ◽  
Vol 78 (1) ◽  
pp. 193-209 ◽  
Author(s):  
D.J. Beare ◽  
P.G. Moore
Keyword(s):  
Life Histories ◽  
Female Dominance ◽  
Annual Life Cycle ◽  
Life History Data ◽  
Processing Data ◽  
Sublittoral Zone ◽  
Males And Females ◽  
The Mean ◽  
Gravid Females ◽  
Autumn And Winter

Detailed catch and life history data for Perioculodes longimanus and Pontocrates arcticus, together with more limited comparable information on Synchelidium maculatum, are reported. Samples were taken year-round using a 0–5 mm mesh D-net towed over sand in the immediate sublittoral zone (-2 to -6 m Chart Datum) in Kames Bay, Great Cumbrae Island, Scotland. Estimated population densities of Perioculodes longimanus were highest in summer. The occurrence of Pontocrates arcticus was more erratic and S. maculatum occurred only in midsummer in very low numbers. The mean sizes of all population categories of Perioculodes longimanus were bigger in summer than in late autumn and winter. Female Perioculodes longimanus parasitized with the copepod Sphaeronella minuta were significantly smaller than the whole category ‘sexable females’. Adult female S. minuta (one per amphipod brood pouch infected) carried — 70–200 eggs per sac. In both Perioculodes longimanus and Pontocrates arcticus females were larger than males. In Synchelidium maculatum, by contrast, males and females were not different in size. Gravid females were present virtually year-round in Perioculodes longimanus and Pontocrates arcticus, with particularly high proportions of ovigerous females in midsummer and low proportions in midwinter. Both of these species had an annual life cycle with only one generation per year. Longevity was estimated at 15 months. The sex ratio nearly always showed substantial female dominance in all three species. Fecundity appeared to be related to body size but, due to egg losses during sample processing, data were too few for detailed analysis. The eggs of Perioculodes longimanus and Pontocrates arcticus were elliptical in shape, with winter eggs being smaller than summer eggs in Perioculodes longimanus, but larger in Pontocrates arcticus. The percentage of ovigerous females in the population was significantly correlated with a range of environmental factors tested, the highest correlation being with maximum weekly air temperature (for Perioculodes longimanus) and daylength (Pontocrates arcticus), although causative effects cannot be established since temperature/daylength factors were not independent variables

Age, growth and reproduction of the axillary seabream, Pagellus acarne, in the Atlantic and Mediterranean waters off southern Spain

2010 ◽  
Vol 91 (6) ◽  
pp. 1243-1253 ◽  
Author(s):  
E.M. Velasco ◽  
N. Jiménez-Tenorio ◽  
J. Del Arbol ◽  
M.A. Bruzón ◽  
J. Baro ◽  
...  
Keyword(s):  
Southern Spain ◽  
Von Bertalanffy ◽  
Alboran Sea ◽  
Gulf Of Cadiz ◽  
Total Length ◽  
Gulf Of Cádiz ◽  
The Mean ◽  
First Maturity ◽  
Alborán Sea ◽  
Growth And Reproduction

The biology, growth and reproduction of the axillary seabream, Pagellus acarne, was studied based on data obtained from the catches of the Andalusia commercial fleet operating off the coasts of southern Spain from October 2003 to September 2004. The axillary seabream had a very wide depth distribution, appearing from the surface down to 500 m depth. The length–weight relationship was given by TW = 0.0048 TL3.3207 (R2 = 0.98) (TW = total weight; TL = total length) for all fish from the Gulf of Cadiz and TW = 0.0093 TL3.1132 (R2 = 0.94) for all fish from the Alboran Sea. The proportion of females to males increases as length increases in both populations and the species is characterized by protandric hermaphroditism. Spawning males were present almost throughout the year although higher percentages were observed in spring and early summer. In females, the spawning period occurred mainly in spring. In both areas, the mean size at first maturity for males was smaller than for females. The mean lengths at first maturity were 18.04 cm for males and 21.7 cm for females from the Gulf of Cadiz, and 17.7 cm and 20.1 cm for males and females from the Alboran Sea, respectively. The average total fecundity was estimated at 290,070 and 173,509 oocytes for Atlantic and Mediterranean individuals, respectively. The parameters of the von Bertalanffy growth model were estimated by age readings of the 247 sagitta collected. Two rings, one opaque and one hyaline, were laid down each year on the otoliths. The opaque zone was formed during spring and summer and the hyaline one during the remaining months of the year. The relationship between otolith radius and total length of the fish was described by the equation: TL = 27.7 OR – 1.8 (r = 0.96) (where OR = otolith radius). The parameters of the fitted Von Bertalanffy growth equation were L∞ = 31.65 cm, k = 0.21 yr−1 in the Gulf of Cadiz and L∞ = 32.14 cm, k = 0.17 yr−1 in the Alboran Sea.

COMPORTAMENTO REPRODUTIVO DAS MULHERES RIBEIRINHAS DO AMANÃ

2008 ◽  
Vol 1 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Edila Arnaud Ferreira Moura
Keyword(s):  
Sustainable Development ◽  
Reproductive Health ◽  
Reproductive Behavior ◽  
Reproductive Period ◽  
Health Programs ◽  
Local Conditions ◽  
The Sustainable Development ◽  
Rivers And Lakes ◽  
Pregnancy And Delivery ◽  
The Mean

This work presents the results of a study about the reproductive behavior of riverine women living in the Sustainable Development Reserve Amanã, in the Middle Solimões region, state of Amazonas. The study was done in 2001 with the objective of identify aspects of the reproductive behavior of 83 women, collected through reproductive history methodology. These women live in small localities along the rivers and lakes in the middle of the Amazonian forest. The study identified that these women initialize their reproductive period at the age of 17, in average, and the mean age of their last pregnancy occurs at the age of 42, considering those above 50 years old. 36% of these 83 women had lost one or more of their children before the age of five. Only 16% use contraceptives and 12% are sterilized. They don’t have access to the basic health assistance in a regular basis and the local midwives are extremely important in their assistance during pregnancy and delivery. This study em phasizes the importance of reproductive health programs including those social and cultural local conditions.

FORMATION HISTORY AND OCEANOGRAPHIC CONTROL OF LATE HOLOCENE MUD DEPOCENTERS IN THE NORTHEASTERN GULF OF CADIZ, SOUTHERN SPAIN

2016 ◽  
Author(s):  
Mary Lee King ◽  
◽  
Till J.J. Hanebuth ◽  
Francisco Lobo ◽  
Hendrik Lantzsch ◽  
...  
Keyword(s):  
Late Holocene ◽  
Southern Spain ◽  
Gulf Of Cadiz ◽  
Formation History ◽  
Gulf Of Cádiz

Batch Precipitation of Lead Iodide

1994 ◽  
Vol 59 (6) ◽  
pp. 1301-1304
Author(s):  
Jaroslav Nývlt ◽  
Stanislav Žáček
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Crystal Size ◽  
Lead Nitrate ◽  
Lead Iodide ◽  
Constant Rate ◽  
Mean Size ◽  
The Mean

Lead iodide was precipitated by a procedure in which an aqueous solution of potassium iodide at a concentration of 0.03, 0.10 or 0.20 mol l-1 was stirred while an aqueous solution of lead nitrate at one-half concentration was added at a constant rate. The mean size of the PbI2 crystals was determined by evaluating the particle size distribution, which was measured sedimentometrically. The dependence of the mean crystal size on the duration of the experiment exhibited a minimum for any of the concentrations applied. The reason for this is discussed.

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