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Registros recuperados: 8
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A drift study of vertical distribution and mortality of Engraulis anchoita eggs and larvae. OceanDocs
Sánchez, R.P.; de Ciechomski, J.D.; Lasta, C.A.; Guerrero, R.A..
Lagrangian changes in distribution and survival within an anchovy egg and larvae patch were studied by means of multiple opening/closing sampling following a free drifting buoy. The buoy was equipped with a radar reflector and flashing light, and it was connected to a current cross drogue floating at 15 m depth, which corresponded to the main egg and larvae concentration within the patch. The drifter was launched on the Buenos Aires continental shelf, off Necochea during the spring spawning peak of 1983. Three discrete depths (within, below and above the thermocline)were repeatedly sampled close to the drogue with a Motoda sampler. Egg and larval abundances in the vicinity of the drogue were monitored at 3/4 hour intervals for a period of three days. Each...
Tipo: Journal Contribution Palavras-chave: Fish larvae; Fish eggs; Vertical migrations; Feeding; Environmental effects; Ichthyoplankton surveys; Vertical distribution; Survival; Abundance; Drifting data buoys; Fishery surveys; Feeding; Fish larvae; Survival; Http://aims.fao.org/aos/agrovoc/c_2838; Http://aims.fao.org/aos/agrovoc/c_2924; Http://aims.fao.org/aos/agrovoc/c_7538.
Ano: 1999 URL: http://hdl.handle.net/1834/1871
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Estimación de la biomasa de adultos desovantes de la anchoíta (Engraulis anchoita)en el área costera bonaerense durante la primavera de 1981 y análisis comparativo de los recuentos de ictioplancton con redes de diferentes mallas OceanDocs
Sánchez, R.P.; de Ciechomski, J.D..
A bongo sampler fifted with nets of two different mesh sizes, 330 and 505 u. was used to collected 137 ichthyoplankton samples in the coastal areas off Buenos Aires Province in October, 1981. The efficiency of the two meshes for catching anchovy eggs and larvae and total ichthyoplankton was examined. The statistical analysis of the samples shows that there are no significant differences between the numbers of anchovy and total eggs collected by the different meshes. As regards anchovy and total larvae the finer mesh showed as significantly higher catching efficiency. The results of this partial estimate do not suggest that a major revision of the total assessment of the complete stock is necessary.
Tipo: Journal Contribution Palavras-chave: Stock assessment; Fish eggs; Stock assessment; Http://aims.fao.org/aos/agrovoc/c_24251.
Ano: 1984 URL: http://hdl.handle.net/1834/2044
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Estudio sobre el crecimiento en peso y factor de condición en larvas de anchoíta, Engraulis anchoita Hubbs & Marini. Variaciones regionales, estacionales y anuales OceanDocs
de Ciechomski, J.D.; Sánchez, R.P.; Alespeiti, G.; Regidor, H..
The equation log W=a+bL (where W=dry weight in ug, and L=total length in mm)was used to describe the growth in weight of larval anchovy collected in two areas of the Argentine sea, sampled in different months and several years. Regression lines were compared by covariance analysis applied to two size groups, namely larvae less and over 10 mm total length, as an evident break in the slopes indicated the existence of a chenge of rythm in the trajectory of larval growth in length. Significant differences between the slopes of the growth lines were observed within the smaller size group. No regional or yearly differences could be established fo larvae larger than 10 mm.
Tipo: Journal Contribution Palavras-chave: Length-weight relationships; Fish larvae; Condition factor; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_2924.
Ano: 1986 URL: http://hdl.handle.net/1834/2023
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Estudios sobre reproducción y fecundidad de la polaca (Micromesistius australis Norma 1937)en el Mar Argentino OceanDocs
Sánchez, R.P.; de Ciechomski, J.D.; Acha, E.M..
An analysis is presented of reproduction aspects of Argentine Sea blue whiting. The species spawns in the study area mostly during August and September, although some spawners have been detected even in November. Total length at 50-per-cent maturity was 35,4 cm for the males and 38.0 for the females. Significant differences between the length of maturity for individuals of the continental shelf compared to those of the slope, have been obtained. The southern blue whiting is a discontinuous spawner, showing one annual reproduction peak. Fecundity was investigated on the basis of samples collected in 1978 by the RV"Walther Herwig" and "Shinkai Maru". A significant positive correlation was also observed at relating oocyte dry weight and gonad factor, whereas...
Tipo: Journal Contribution Palavras-chave: Reproduction; Fecundity; Sexual maturity; Stock assessment; Stock assessment; Reproduction; Fecundity; Sexual maturity; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_15725; Http://aims.fao.org/aos/agrovoc/c_7016.
Ano: 1986 URL: http://hdl.handle.net/1834/2028
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Evaluación de la biomasa de adultos desovantes, distribución vertical y variación cuantitativa de la intensidad de los desoves de la anchoíta (Engraulis anchoita) durante la primavera de 1982 OceanDocs
de Ciechomski, J.D.; Sánchez, R.P.; Lasta, C.A..
Ichthyoplankton was sampled in 9 exploratory cruises in the sea off Buenos Aires province (Argentina), Uruguay and Brazil, during the spawning peak of the anchovy in spring-early summer and mid-autumn. The most abundant speices in the ichthyoplankton was Engraulis anchoita, representing 88. of the eggs and 76. of the larvae collected in all the cruises. These percentages vary boath regionally and seasonally; as regards eggs, the lowest percentage (10. ) was found in January. The distribution of anchovy eggs and larvae, covered almost entirely the surveyed area, with the exception of hte region influenced by the River Plate estuary. Minimum salinity tolerance for the species eggs was 23.5o/oo. The eastern limit of the distribution of anchovy eggs, extends...
Tipo: Journal Contribution Palavras-chave: Vertical distribution; Fish eggs; Spawning populations.
Ano: 1986 URL: http://hdl.handle.net/1834/2040
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Ichthyoplankton composition, distribution and abundance on the southern patagonian shelf and adjacent waters. OceanDocs
Ehrlich, M.D.; Sánchez, R.P.; de Ciechomski, J.D.; Machinandiarena, L.; Pájaro, M..
This paper reviews the information on pelagic and demersal fish eggs and larvae, describing the distribution and seasonality of different species and their arrangement in icthyoplankton assemblages in the Southern patagonian waters. It also reports on 11 surveys conducted by INIDEP during 1992-1995. A total of 488 ichthyoplankton samples were analyzed. Fish eggs have been recognized in 47. of all ichthyoplankton samples. They belong to three species: Coelorhynchus fasciatus, Macrourus whitsoni and Micromesistius australis. Fish larvae of 23 species and 17 families have been identified in 96. of all samples analyzed. Spawning of most species begins in autumn, and progresses through winter, when the southern blue whiting and grenadier fish contribute to...
Tipo: Journal Contribution Palavras-chave: Ichthyoplankton; Fish larvae; Fish eggs; Seasonal distribution; Abundance; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_2924.
Ano: 1999 URL: http://hdl.handle.net/1834/2574
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Observaciones sobre embriones de larvas y juveniles de la pescadilla (Cynoscion striatus) OceanDocs
de Ciechomski, J.D.; Cassia, M.C..
Observations on the embrionic and larval development of Cynoscion striatus are presented. The description are made on the basis of material obtained by artificial fertilization. Eggs are pelagic, spherical, 700-840µ in diameter and with single oil globule of 210µ-240µ. The yolk is homogeneous and the chorion has smooth surface. The embryonic development is short and at temperatures of 19°-20°C hatching takes place, 34-36 hours after the fertilization. The larvae at hatching are small, about 2 mm in length and not advanced in their development. The mouth is not functional and the anus is not open. The oil globule is situated in the posterior part of the yolk sac; the position of the anus is close to the posterior end of the yolk sac and the digestice tract...
Tipo: Journal Contribution Palavras-chave: Embryos; Fish larvae; Fish larvae; Http://aims.fao.org/aos/agrovoc/c_2924.
Ano: 1982 URL: http://hdl.handle.net/1834/2045
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Reproducción y fecundidad del surel (Trachurus picturatus australis) OceanDocs
Cassia, M.C.; de Ciechomski, J.D..
Studies on the sexual maturation on the jack mackerel in the area close to Mar del Plata were carried out throughout the whole year, 56 almost ripe females between 160 and 210 mm in total length and between 38 and 78 g is weight were taken into consideration for fecundity determinations. The most importante results obtained during these studies are the following: The gonad index was rather high and reached the value of 11.5.-The reproduction season is a rather one and the spawning occurs mainly in December and January.-It is assumed that a female of this species spawns once over a reproduction season, but shedding numerous batches of eggs in short intervals.-The lowest value found for the fecundity was 15.825 ovocites and the highest one was 82.892.-It is...
Tipo: Journal Contribution Palavras-chave: Reproduction; Fecundity; Mackerel fisheries; Reproduction; Fecundity; Http://aims.fao.org/aos/agrovoc/c_6507; Http://aims.fao.org/aos/agrovoc/c_15725.
Ano: 1980 URL: http://hdl.handle.net/1834/2064
Registros recuperados: 8
Primeira ... 1 ... Última
 

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