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  • 1
    Electronic Resource
    Electronic Resource
    Spatio-temporal distribution pattern of the red band-fish Cepola rubescens Linnaeus at different stages of its life cycle in the northwestern Mediterranean (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 39 (1991), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The larvae of Cepola rubescens Linnaeus, 1766 were collected from May to October with a surface temperature of 17.5°C at the beginning of the spawning. They were widely distributed over the continental shelf and the greatest concentrations were found at stations with depth around 100 m. During all months, most of the larvae were of small size, between 2.0 and 3.0 mm s.l. The juveniles and adults were caught in a wide range of depths, from less than 25 m to about 200 m, and the highest abundance was also found at depths of about 100 m, but no large individuals were found at depths less than 50 m. The catches of the trawling fleet showed a marked seasonality, with maximum values at the end of spring and minimum at the end of autumn and the beginning of winter. This seasonality seems to be related to reproduction since the highest catches were obtained during the spawning period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1991.tb04385.x
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  • 2
    Electronic Resource
    Electronic Resource
    Spawning and distribution of bluefish Pomatomus saltatrix (L.) in the northwestern Mediterranean (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 42 (1993), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The present study was carried out on the Catalan coast, the northern limit of the geographic distribution of Pomatomus saltatrix (Linnaeus, 1766) in the Mediterranean. Within the area studied, both larvae and adults were more abundant in the southern part, where surface temperature was slightly higher than in the north. Spawning of P. saltatrix was limited to the warmest months, from July to September, when the surface temperature was about 25° C, The most common larval sizes, between 2.25 and 2.75 mm s.l., were distributed over the continental shelf, and the greatest concentrations were found between 20 and 100 m, suggesting an inshore spawning. Larvae, including the smallest sizes, were found in the most superficial layers and no evidence of vertical migration was observed. The species was regularly fished in the southern zone, maximum monthly catches ranging between 10–20 tonnes. The presence of adults in the coastal zone showed a marked seasonality closely related to temperatur, the lowest catches corresponding to the coldest months.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1993.tb00309.x
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  • 3
    Electronic Resource
    Electronic Resource
    Feeding pattern and the visual light environment in myctophid fish larvae (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish biology 63 (2003), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The trophic spectrum and feeding pattern of two myctophid larvae, Benthosema glaciale and Myctophum punctatum, were analysed in relation to changes in daily light intensity. The larvae of both species live relatively deep, occurring in the first 100 m, though distribution of M. punctatum extends to 150 m depth. The present study, carried out in the western Mediterranean (Alboran Sea), indicated that the larvae of the two species exhibit different foraging strategies. Both started to feed at dawn, but while feeding of M. punctatum was high at dawn and dusk, the feeding of B. glaciale remained high throughout the day. The light intensity profiles taken during the day indicated that at the depths where the species dwelt, light intensity was enough to provoke a feeding response. The larvae of these species, in contrast to the majority of fish larvae, had an enhanced sensitivity due to their pure rod-like retina, an adaptation for foraging at low light intensities. Both species showed an ontogenetic change in their diet: B. glaciale preflexion larvae fed mainly on copepod eggs and nauplii, while postflexion larvae consumed calanoid copepodites; M. punctatum larvae showed a more diversified diet, composed of larger prey items. The stalked and elongated eye of M. punctatum larvae would enable the detection of a greater range of prey in terms of shape and size. In addition, the retina of this species was characterized by a higher summation ratio and longer photoreceptors, indicating a preference for dimmer environments. This could explain the decreasing feeding activity of M. punctatum during the high light intensity of the middle daylight hours. As a clear relationship existed between feeding pattern and light intensity in these myctophid larvae, the visual characteristics of each species could help to explain the different strategies of foraging behaviour, therefore avoiding a possible overlap in their trophic niche.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2003.00259.x
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  • 4
    Electronic Resource
    Electronic Resource
    Lipid content in the early life stages of three mesopelagic fishes (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish biology 63 (2003), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Changes in lipid concentration during early ontogenetic stages were determined in three mesopelagic fish species, Benthosema glaciale, Hygophum benoiti and Maurolicus muelleri. Total lipid content per larva was related to size and mass and increased over the course of development. In all three species, the dry mass : total lipid ratio displayed a better fit than the standard length : total lipid ratio. Larvae of B. glaciale had a higher amount of lipid content, at a given mass, than the other two species. The rate of lipid accumulation with increasing larval development was similar in B. glaciale and H. benoiti, and both were higher than in M. muelleri larvae. Furthermore, total lipid concentration values, as a proportion of dry mass, increased significantly from the larval to the juvenile stages in B. glaciale(from 16 to 55%) and M. muelleri(from 9 to 20%). The present study has allowed comparisons to be drawn of the ability on the early developmental stages of deep-sea fishes to accumulate energy reserves, both within and among species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1095-8649.2003.00196.x
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  • 5
    Electronic Resource
    Electronic Resource
    Early development and spawning ofSebastes capensis in the Southeast Atlantic (1990)
    Springer
    Marine biology 107 (1990), S. 389-395 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The early stages of development of the scorpionfishSebastes capensis in the Southeast Atlantic are described. A morphometric study of the larval stages, which includes the allometric relationships between different parts of the body and the standard length during development, are given. The larvae of this species were distinguished from those of other scorpionfish in the region on the basis of larval morphology and the pigmentation pattern, in conjunction with the bathymetric distribution of the adults. A comparative study of these larvae and those of otherSebastes spp. from the southern coasts of South America is included. Considering the usefulness of larval characters in systematic studies, the description presented here could contribute in elucidating the confused taxonomic status of the genusSebastes in the Southern Hemisphere. In the Southeast Atlantic spawning ofS. capensis takes place all year long, but it is most intense in spring and summer, coinciding with maximum upwelling and lower temperatures inshore. The spatial distribution of the larvae revealed that they prefered cool South Atlantic waters, with the 16 °C isotherm being the upper limit of their distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313420
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  • 6
    Electronic Resource
    Electronic Resource
    Vertical distribution of fish larvae in the north-west Mediterranean Sea in spring (1997)
    Springer
    Marine biology 129 (1997), S. 289-300 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The vertical distribution of the larvae of shelf-dwelling fish species that spawn in the NW Mediterranean Sea in spring was studied in relation to environmental data. Two sampling cycles were carried out at fixed stations on the continental shelf in May and June 1992. Three patterns of larval vertical distribution for the various taxa represented in the samples were observed. The larvae of most species (e.g. Boops boops, Diplodus sargus) were mainly located in the surface layer (10 m), others (e.g. Arnoglossus sp.) had broader distributions in the upper 40 m of the water column, and but a few (e.g. Gobiidae) were present in large concentrations at greater depths. The vertical distribution patterns of the various species showed no variations, despite high hydrographic variability during the study. The vertical distribution of only a few species (e.g. Arnoglossus sp., Crystallogobius linearis and Engraulis encrasicolus) varied over the diel cycle. The possible influence of the vertical distribution of fish larvae on their horizontal distribution patterns is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050169
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  • 7
    Electronic Resource
    Electronic Resource
    Relationship between zooplankton distribution, geographic characteristics and hydrographic patterns off the Catalan coast (Western Mediterranean) (1989)
    Springer
    Marine biology 103 (1989), S. 153-159 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We studied the distribution patterns of ten zooplankton taxa of the Catalan coast (Western Mediterranean) using data collected in six research cruises along the continental shelf from April to July and September to October 1983. Zooplankton biomass ranged from 0.2–0.4 mg m-3 to 48–60 mg m-3, the greatest values being recorded between April and May, when gelatinous zooplankton concentrations were consistently present along the edge of the continental shelf. We identified the main factors contributing to the observed pattern of zooplankton distribution as the high degree of environmental fluctuation close to the coast (thermal gradient from north to south), the structural heterogeneity inherent to the continental shelf, and the persistence of a hydrographical front along the margin of the shelf.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00543342
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  • 8
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    Natural diet and predation impacts of Pelagia noctiluca on fish eggs and larvae in the NW Mediterranean (2016)
    Oxford University Press
    Details
    Publication Date: 2016-10-08
    Description: Jellyfish are important predators of fish eggs and larvae and predation is believed to be the main factor determining fish recruitment. The diet of different life stages of Pelagia noctiluca and their potential predation impact on ichthyoplankton were investigated in the NW Mediterranean Sea. In June, the spatial distribution of jellyfish and fish larvae, particularly those of anchovy, overlapped in the study area. Gut content analyses showed relatively high abundance of ichthyoplankton in large medusae, while siphonophores were the most numerous prey of ephyrae. Gut contents, digestion times (DT), and prey and predator abundances were used to estimate predation effects (% of standing stock consumed time –1 ) of P. noctiluca . Medusae consumed 0.1–0.9% h –1 of the anchovy larvae, while ephyrae consumed 1.5–2.7% h –1 of all fish larvae and 1.5–10.4% h –1 of anchovy larvae. We estimate that medusae and ephyrae consumed 0.02–3.2% h –1 and 0.4–7.1% h –1 of fish eggs, respectively. P. noctiluca can reach extremely high numbers and in a bloom situation it can be an important predator of fish larvae, in particular anchovy. Hence it may play an important role in the planktonic food web with a possible impact on anchovy populations.
    Print ISSN: 0142-7873
    Electronic ISSN: 1464-3774
    Topics: Biology
    Published by Oxford University Press
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  • 9
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    Distribution and feeding dynamics of larval red mullet (Mullus barbatus) in the NW Mediterranean: the important role of cladocera (2015)
    Oxford University Press
    Details
    Publication Date: 2015-07-28
    Description: The feeding habits of Mullus barbatus larvae and the horizontal and vertical distribution of larvae and their dominant prey were studied in the NW Mediterranean during the summer oligotrophic period. The water column showed marked stratification with a deep chlorophyll maximum beneath the thermocline. Horizontal and vertical distribution of larvae showed good correspondence with that of cladocera, their preferential prey from 8 mm standard length. Both groups were restricted to the upper levels of the water column, above thermocline, and were very abundant in the southern area, associated with the low salinity waters from the Ebro river runoff. Prey items consumed by the smallest size classes of larvae 〈8 mm SL were dominated by copepod nauplii, then diet and prey selectivity shifted towards the cladoceran Evadne spp. The amount and mean size of ingested prey increased throughout development while niche breadth remained constant. This constancy in niche breadth implies that during development larvae shift to other niches, with the replacement of nauplii by cladocerans. Results suggest that M. barbatus larvae probably depend on energy derived from the microbial food web, via their feeding on cladocera, emphasizing the key trophic role of cladocera in this oligotrophic Sea.
    Print ISSN: 0142-7873
    Electronic ISSN: 1464-3774
    Topics: Biology
    Published by Oxford University Press
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  • 10
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    Changes in life-history traits in relation to climate change: bluefish (Pomatomus saltatrix) in the northwestern Mediterranean (2012)
    Oxford University Press
    Details
    Publication Date: 2012-06-14
    Description: Sabatés, A., Martín, P., and Raya, V. 2012. Changes in life-history traits in relation to climate change: bluefish ( Pomatomus saltatrix ) in the northwestern Mediterranean. – ICES Journal of Marine Science, 69: 1000–1009. This study shows the strong relationship between the increasing surface temperature in the NW Mediterranean and the expansion northwards of the bluefish distribution range with the species reproducing in the new distribution areas. Two shifts in temperature were detected: the first one in the early 1980s and the second around 1997. This last shift, explained by warmer springs (April–June), when the species migrates for spawning, led to the observed changes in bluefish. In the western Mediterranean basin, a significant increase in bluefish landings was observed by the mid nineties, whereas in the Catalan coast, the northern edge of the species distribution, a northward expansion was observed from 2000. At present, spawning takes place all along the Catalan coast (June to September), including the new distribution areas, being 21°C the threshold for the presence of larvae in the plankton. This temperature was not attained in June two decades ago. The highest concentrations of larvae were located near the mouth of the Ebro River and their distribution to the north did not extend beyond the thermal front. Bluefish has taken the advantage of the changing environmental conditions and is established in new northernmost distribution areas.
    Print ISSN: 1054-3139
    Electronic ISSN: 1095-9289
    Topics: Biology , Geosciences , Physics
    Published by Oxford University Press
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