Observations on the Vertical Distribution of Eggs and Larvae of Mackerel and other Teleosts in the Celtic Sea and on the Sampling Performance of Different Nets in Relation to Stock Evaluation

Southward, A. J.; Bary, B.

doi:10.1017/s0025315400028356

Cited by 11 publications

(6 citation statements)

References 13 publications

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“…This precise timing of spawning is typical of both the northern and southern contingents of the northwest Atlantic mackerel stock (Ware, 1977;Berrien, 1978;Morse, 1980). Mackerel are known to spawn mostly above the thermocline (Sette, 1950;Southward and Bary, 1980;Coombs et al, 1981) so as expected, in Long Island Sound peaks in spawning activity coincide with the time of formation of the seasonal thermocline ( Fig. 2 and 4), and with the onset of seasonal stratification.…”

Section: Discussionsupporting

confidence: 62%

Diets and selective feeding by larvae of Atlantic mackerel Scomber scombrus on zooplankton

Peterson¹,

Ausubel²

1984

Mar. Ecol. Prog. Ser.

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This paper describes the diets of 201 larvae of Atlantic mackerel Scomber scombrus L. collected from Long Island Sound, New York (USA) during May-June 1982 and 1983. First-feeding larvae (3.5 mm in length) were phytophagous. The diets of larvae 4.5 mm were composed of the nauplii of Acartia hudsonica, Temora longicornis and Pseudocalanus sp. Larvae > 5 mm ate some copepodites of A. hudsonica and T. longicornis and smaller proportions of phytoplankton and copepod nauplii. Mackerel 3 6.5 mm were cannibalistic, eating larvae 3.5 to 4.5 mm in length. Weight of stomach contents averaged 1.8 % of an individual's body weight. We calculated that, in order to satisfy its daily energy requirement, a mackerel larva must consume 25 to 75 % of its body weight per day. Larvae fed selectively, taking a greater proportion of T. longicornis and Pseudocalanus sp. nauplii and a lesser proportion of A. hudsonica nauplii than expected by chance alone. Ivlev index values for T. longicomis nauplii were +0.66, for Pseudocalanussp., +0.25, and for A. hudsonica, -0.55. The Chesson index and Pearre's 'C' yielded the same result. We hypothesize that mackerel larvae select food primarily on the basis of prey visibility (both Pseudocalanus sp. and T. longicornis nauplii are more motile than A. hudsonica nauplii). Even though mackerel larvae consume large numbers of copepod nauplii per day and feed selectively on certain species, mackerel larvae are not sufficiently abundant in Long Island Sound to have an impact on copepod population dynamics.

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Section: Discussionsupporting

confidence: 62%

Diets and selective feeding by larvae of Atlantic mackerel Scomber scombrus on zooplankton

Peterson¹,

Ausubel²

1984

Mar. Ecol. Prog. Ser.

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“…were located slightly deeper at night than during the day as also noted by Olivar and Sabatés (1997) during the summer period in the Mediterranean. Nevertheless, in the North Atlantic Ocean, no evidence of diel variation has been described in the larvae of this genus (Röpke, 1989;Conway et al, 1997), while Southward and Bary (1980) found indications that they migrated upwards at night. The vertical distribution range detected in Arnoglossus laterna is broadly similar to that observed in previous studies conducted in the Mediterranean and in the North Atlantic Ocean (Röpke, 1989;Olivar and Sabatés, 1997) and, as described in these studies, larvae were less abundant at surface during the night.…”

Section: S Pilchardus < 10 MM %mentioning

confidence: 99%

Diel vertical distribution of fish larvae during the winter-mixing period in the Northwestern Mediterranean

Sabatés

2004

ICES Journal of Marine Science

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A. SabatésSabatés, A. Diel vertical distribution of fish larvae during the winter-mixing period in the Northwestern Mediterranean. e ICES Journal of Marine Science, 61: 1243e1252.The vertical distributions of the larvae of shelf and oceanic fish species that spawn during the winter-mixing period in the Mediterranean are described from 22 vertically stratified plankton tows. Diel differences in the vertical distribution patterns in relation to physical data and potential prey abundance throughout the water column were examined. Even in absence of stratification, the larvae of the various fish species showed different patterns of vertical distribution and diel changes. The larvae of shelf-dwelling species were found in the surface layers, mainly above 50-m depth, and with some exceptions, with very little diel variation in depth distribution. Therefore, the vertical distribution of the larvae of these species coincided with the maximum concentrations of their potential food, nauplii and copepodite stages of copepods. The larvae of mesopelagic fishes showed deeper distributions in the water column and most of these species were located closer to the surface during the day than at night. Given the homogeneity of the physical characteristics throughout the water column, except for light, this behaviour may be determined not only by the higher concentration of prey in the surface layers but also by adequate light levels for feeding.

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“…Thermoclines have been shown to areas containing identical species was conducted durinfluence these patterns in fish larvae (Ahlstrom 1959, ing the 1987 'Meteor' expedition in the Arabian Sea. Southward & Bary 1980, Kendall & Naplin 1981 The Arabian Sea is one of the most productive Sameoto 1982, Southward & Barrett 1983 oceanic areas in the world (Ryther et al 1966). It has al.…”

Section: Introductionmentioning

confidence: 99%

Do larvae of mesopelagic fishes in the Arabian Sea adjust their vertical distribution to physical and biological gradients?

Röpke¹

1993

Mar. Ecol. Prog. Ser.

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Size-specific vertical distributions of larvae of the myctophid species Benthosema pterotum, Bolinichthys longipes, Diaphus arabicus, Diogenichthys pan urgus, Hygophum proximum, and Myctophum aurolaternatum, and of the photichthyid species Vinciguerria nimbaria were analyzed from 3 hydrographically and ecologically different regions of the northern Arabian Sea (Indian Ocean) during the intermonsoon period (March-June) 1987, using a MOCNESS-1 net system to 150 m depth under comparable circumstances. Regional data on the vertical centres of mass were compared by species and length class. Concurrent measurements of physical stratification and of prey abundance and distribution in the water column were related to larval distribution. Results indicate that larvae of mesopelagic species are found at relatively deep depth. They move downward during early development, adapting to their later life in the mesopelagic zone. Species-and size-specific depth selection was responsible for much of the interregional differences in vertical distribution of fish larvae in general, since the species composition was different between regions. Most of the myctophid and photichthyid species avoided the upper mixed layer, which contained the highest concentrations of potential prey organisms, and their distribution was also not directly related to pycnocline depth (except for B. pteroturn). Below the mixed surface layer the abundance and vertical distribution of potential prey was more important in determining the vertical distribution of the larvae than the gradient of physical stratification. The low abundance of prey on the shelf off Pahstan was probably responsible for the strong concentration of larvae just below the mixed layer and for their poor nutritional condition in that area. Larvae of identical species and length class occurred on average about 20 m deeper in the central oceanic region compared to the coastal areas off Oman and Pakistan. This was probably due to a deeper and broader distribution of prey organisms.

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Observations on the Vertical Distribution of Eggs and Larvae of Mackerel and other Teleosts in the Celtic Sea and on the Sampling Performance of Different Nets in Relation to Stock Evaluation

Cited by 11 publications

References 13 publications

Diets and selective feeding by larvae of Atlantic mackerel Scomber scombrus on zooplankton

Diets and selective feeding by larvae of Atlantic mackerel Scomber scombrus on zooplankton

Diel vertical distribution of fish larvae during the winter-mixing period in the Northwestern Mediterranean

Do larvae of mesopelagic fishes in the Arabian Sea adjust their vertical distribution to physical and biological gradients?

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