Spatial distribution and biomass of pelagic fish in the East China Sea in summer, based on acoustic surveys from 1997 to 2001

Ohshimo, Seiji

doi:10.1111/j.1444-2906.2004.00818.x

Cited by 39 publications

(26 citation statements)

References 20 publications

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“…E. japonicus (anchovies), in particular, are predominant in the dolphinfish diet in the southwestern Sea of Japan during summer [27]. These are pelagic fish that aggregate on the surface waters of the East China Sea, during summer [30]. These anchovies may also be restricted to the surface when the thermocline becomes steep.…”

Section: Discussionmentioning

confidence: 99%

The First Record of Peritoneal Cavity Temperature Recording in Free-Swimming Dolphin Fish Coryphaena hippurus by Using Archival Tags, on the East Coast of Taiwan

Furukawa¹

2015

JAMB

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The ambient water temperature and peritoneal cavity temperature of two dolphin fish Coryphaena hippurus, in relation to their vertical movements were examined using archival tags, on the east coast of Taiwan. The peritoneal cavity temperature of the dolphinfish nearly corresponds to the ambient water temperature on a half-day scale, suggesting that they are typical ectothermic fish. This is quite different from Thunnus species, such as big eye, T.obesus and bluefin tuna, T. orientalis, as reported elsewhere. It is known that dolphinfish are predominantly confined to the surface mixed layer, in contrast to the immature bluefintuna that repeatedly dive across the thermocline for short periods; this is when the horizontal distributions of these species overlap. By using a simple heat budget model, we compared the thermo conservation abilities of dolphinfish and immature bluefin tuna, which revealed that the peritoneal cavity temperature of dolphinfish showed more rapid decrease when they dived beyond the thermocline that of the immature bluefin tuna that could maintain a relatively constant body temperature. This is one possible reason why these two species display such markedly different patterns of vertical movement, which is influenced by the thermocline.

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Section: Discussionmentioning

confidence: 99%

The First Record of Peritoneal Cavity Temperature Recording in Free-Swimming Dolphin Fish Coryphaena hippurus by Using Archival Tags, on the East Coast of Taiwan

Furukawa¹

2015

JAMB

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“…The echo characteristics of a fish school may correspond to specific criteria (Scalabrin 1997, Ohshimo 2004). SSM were the most common of the 5 echo types encountered in both locations, being present in 30% of the ESDUs in the overall data base.…”

Section: Schooling Behaviourmentioning

confidence: 99%

“…In the Mediterranean Sea, where the bulk of school biomass is composed of sardines and anchovies, schooling has generally been observed during daytime with only very few schools observed at night (Bahri & Fréon 2000). In the East China and Yellow Seas, Ohshimo (2004) conducted acoustic surveys during daytime because fish schools were considered to be diffused at night. In the Baltic Sea most pelagic fish schools were found at night in scattering layers in a reduced depth range near the surface (Orlowski 2001), which is the same finding as for perch in a freshwater lake in the Alps (Guillard et al 2004), herring in lake Opeongo (Milne et al 2005) and anchovies in South Pacific (Gutierrez et al 2005).…”

Section: Diel Schooling Dynamicsmentioning

confidence: 99%

Schooling behaviour of small pelagic fish: phenotypic expression of independent stimuli

Brehmer¹,

Gerlotto²,

Laurent³

et al. 2007

Mar. Ecol. Prog. Ser.

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We compared echo sounder measurements of fish schools on Venezuelan and Senegalese coastal shelves. In both areas Sardinella aurita was the predominant aggregative species; the stocks are known to be genetically independent. Persistent school typology is described by analysing 7 acoustic surveys in Venezuela and comparing with pioneer observations in Senegal. The echo types encountered in both countries were comparable, with S. aurita and their associated species having comparable schooling behaviour. School morphology appears to be more related to species than to global characteristics of their ecosystems, as fish school descriptors were similar for both stocks. Nevertheless, S. aurita may adopt different school morphologies. Differentiation between day and night fish schools was mainly due to morphological variables, as determined by fractal dimension. Echo types were different between day and night in both Venezuela and Senegal. This analysis shows that several independent parameters can influence school morphology. However, although schooling behaviour is temporally highly variable, it shows several constant, typical 2D morphological structures, i.e. echo types. The observation of small pelagic fish schools occurring during the night is not unusual according to the literature, although a strict diurnal schooling behaviour, with scattering during the night, is often reported. Schooling behaviour appears to be a phenotypic expression depending on biotic and abiotic stimuli, intrinsic characteristics and motivation.

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“…These studies were restricted to subjective classification of fish species [14,15], while limited to single species such as anchovy [14,16] and sardine [17,18] in other works. In this work, we applied two objective tools of supervised echo-trace classification, discriminant function analysis (DFA) and artificial neural network (ANN).…”

Section: Introductionmentioning

confidence: 99%

Classification of fish schools based on evaluation of acoustic descriptor characteristics

et al. 2009

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Acoustic surveys were conducted from 2002 to 2006 in the East China Sea off the Japanese coast in order to develop a quantitative classification typology of a pelagic fish community and other co-occurring fishes based on acoustic descriptors. Acoustic data were postprocessed to detect and extract fish aggregations from echograms. Based on the expert visual examination of the echograms, detected schools were divided into three broad fish groups according to their schooling characteristics and ethological properties. Each fish school was described by a set of associated descriptors in order to objectively allocate each echo trace to its fish group. Two methods of supervised classification were employed, the discriminant function analysis (DFA) and the artificial neural network technique (ANN). We evaluated and compared the performance of both methods, which showed encouraging and about equally highly correct classification rates (ANN 87.6%; DFA 85.1%). In both techniques, positional and then morphological parameters were most important in discriminating among fish schools. Fish catch composition from midwater trawling validated the fish group classification through one representative example of each grouping. Both methods provided the essential information required for assessing fish stocks. Similar techniques of fish classification might be applicable to marine ecosystems with high pelagic fish diversity.

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Spatial distribution and biomass of pelagic fish in the East China Sea in summer, based on acoustic surveys from 1997 to 2001

Cited by 39 publications

References 20 publications

The First Record of Peritoneal Cavity Temperature Recording in Free-Swimming Dolphin Fish Coryphaena hippurus by Using Archival Tags, on the East Coast of Taiwan

The First Record of Peritoneal Cavity Temperature Recording in Free-Swimming Dolphin Fish Coryphaena hippurus by Using Archival Tags, on the East Coast of Taiwan

Schooling behaviour of small pelagic fish: phenotypic expression of independent stimuli

Classification of fish schools based on evaluation of acoustic descriptor characteristics

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