Vertical distribution of fish eggs and larvae in the Irish Sea and southern North Sea

Conway, D. V. P.; Coombs, S. H.; Smith, C.R.

doi:10.1006/jmsc.1996.0176

Cited by 49 publications

(44 citation statements)

References 20 publications

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“…The use of multiple gears to sample at different temporal and spatial scales is not uncommon in fisheries-independent and oceanographic surveys (Conway et al 1997;Stehle et. al.…”

Section: Discussionmentioning

confidence: 99%

A comparison of sampling methods for larvae of medium and large epipelagic fish species during spring SEAMAP ichthyoplankton surveys in the Gulf of Mexico

Habtes¹,

Muller‐Karger²,

Roffer³

et al. 2014

Limnology & Ocean Methods

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Annual ichthyoplankton surveys have been conducted in the Gulf of Mexico during spring since 1982 by the National Oceanic and Atmospheric Administration (NOAA) National Marine Fisheries Service (NMFS) Southeast Area Monitoring and Assessment Program (SEAMAP). Historically, ichthyoplankton has been assessed using bongo and surface neuston nets. A new sampling gear, the S-10 net, was tested between 2009 and 2011. This is a 1 × 2 m frame fitted with a 0.505 mm mesh net, towed in a yo-yo fashion between the surface and 10 m. Sampling effectiveness of the three gears was compared by examining the abundance and length of larvae of bluefin tuna (Thunnus thynnus) and seven co-occurring pelagic taxa (Auxis spp., Euthynnus alleteratus, Coryphaena spp., Katsuwonus pelamis, other Thunnus spp., family Istiophoridae, and Xiphias gladius) and vertical distributions of scombrid taxa were examined using MOCNESS samples. Permutational multivariate analysis of variance (PERMANOVA) of net type and time of sampling (day/night) indicated that net type was a significant factor in assessing abundance and length for all taxa. Highest abundances for seven of eight taxa were in S-10 samples, and MOCNESS samples confirm highest scombrid abundance between the surface and 20 m. Our results show sampling effectiveness strongly depends on the depth fished by the net and that the S-10 net was more effective than standard SEAMAP bongo and neuston nets. Thus, future sampling with the S-10 net may improve the annual index of larval abundance for the western population of Atlantic bluefin tuna, traditionally based on abundance from bongo samples.

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“…The use of multiple gears to sample at different temporal and spatial scales is not uncommon in fisheries-independent and oceanographic surveys (Conway et al 1997;Stehle et. al.…”

Section: Discussionmentioning

confidence: 99%

A comparison of sampling methods for larvae of medium and large epipelagic fish species during spring SEAMAP ichthyoplankton surveys in the Gulf of Mexico

Habtes¹,

Muller‐Karger²,

Roffer³

et al. 2014

Limnology & Ocean Methods

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“…Consequently, our data on migration amplitude concentrate on the most abundant organisms and their potential predators. Accordingly, different species of fish larvae were grouped to obtain a more accurate estimation of the DVM (details of the diurnal and nocturnal vertical distribution of larval fish species are given in Conway et al 1997).…”

Section: Methodsmentioning

confidence: 99%

Flexible diel vertical migration behaviour of zooplankton in the Irish Sea

Irigoien¹,

Conway²,

Harris³

2004

Mar. Ecol. Prog. Ser.

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The diel vertical migration (DVM) of the whole plankton community was investigated in the central and coastal Irish Sea. Generally, more than 60% of the plankton did not perform significant DVM. A correlation analysis of the weighted mean depths of different organisms and their potential predators suggested relationships between 2 groups: Oithona spp., copepod nauplii and fish larvae, and Calanus spp., Pseudocalanus elongatus and chaetognaths (Sagitta spp.). Organisms showing significant DVM were chaetognaths (Sagitta spp.), Calanus spp. and P. elongatus. Calanus spp. showed clear ontogenic variations in DVM and, along with P. elongatus, demonstrated great flexibility in both the amplitude and direction of migration. P. elongatus did not migrate in the coastal area and Calanus spp. showed a clear reverse migration. The direction of migration appeared to be related to the vertical position of the chaetognaths in the water column during the day.

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“…Contrary to the Baltic Sea, in the North Sea sprat eggs and larvae are distributed in the upper 5-20 m of the water column (Conway et al 1997). Wahl and Alheit (1988) report the peak spawning time for North Sea sprat to be in May/June.…”

Section: Population Specific Future Implicationsmentioning

confidence: 99%

“…As the spawning season progresses the eggs were found higher in the water column. Alternately in the North Sea sprat eggs float in the surface layers (5-20 m, Conway et al 1997). Historic observations of egg and larval development are limited to a few temperature regimes and the majority of studies use field caught sprat eggs and larvae which causes variation due to the difference in age (e.g.…”

Section: Introductionmentioning

confidence: 99%

The influence of temperature on the development of Baltic Sea sprat (Sprattus sprattus) eggs and yolk sac larvae

et al. 2008

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In spring 2004 and 2005 we performed two sets of experiments with Baltic sprat (Sprattus sprattus balticus Schneider) eggs and larvae from the Bornholm Basin simulating ten different temperature scenarios. The goal of the present study was to analyse and parameterise temperature effects on the duration of developmental stages, on the timing of important ontogenetic transitions, growth during the yolk sac phase as well as on the survival success of eggs and early larval stages. Egg development and hatching showed exponential temperature dependence. No hatching was observed above 14.7°C and hatching success was significantly reduced below 3.4°C. Time to eye pigmentation, as a proxy for mouth gape opening, decreased with increasing temperatures from 17 days post hatch at 3.4°C to 7 days at 13°C whereas the larval yolk sac phase was shortened from 20 to 10 days at 3.8 and 10°C respectively. Maximum survival duration of non-fed larvae was 25 days at 6.8°C. Comparing the experimental results of Baltic sprat with existing information on sprat from the English Channel and North Sea differences were detected in egg development rate, thermal adaptation and in yolk sac depletion rate (YSDR). Sprat eggs from the English Channel showed significantly faster development and the potential to develop at temperatures higher than 14.7°C.North Sea sprat larvae were found to have a lower YSDR compared to larvae from the Baltic Sea. In light of the predictions for global warming, Baltic sprat stocks could experience improved conditions for egg development and survival.

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Vertical distribution of fish eggs and larvae in the Irish Sea and southern North Sea

Cited by 49 publications

References 20 publications

A comparison of sampling methods for larvae of medium and large epipelagic fish species during spring SEAMAP ichthyoplankton surveys in the Gulf of Mexico

A comparison of sampling methods for larvae of medium and large epipelagic fish species during spring SEAMAP ichthyoplankton surveys in the Gulf of Mexico

Flexible diel vertical migration behaviour of zooplankton in the Irish Sea

The influence of temperature on the development of Baltic Sea sprat (Sprattus sprattus) eggs and yolk sac larvae

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