Functional morphology and behavior of early life stages of red sea bream.

Fukuhara, Osamu

doi:10.2331/suisan.51.731

Cited by 56 publications

(28 citation statements)

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“…The average swimming speeds recorded for the temperate larvae in the present study ranged from 6.3 to 11.2 BL s ; Fukuhara 1985, 1987, Blaxter 1986, Miller et al 1988, Langdon & Collins 2000. Lower water temperature can reduce the swimming speed of fish larvae (Fuiman & Batty 1997).…”

Section: Discussionmentioning

confidence: 65%

“…In contrast to tropical fishes, larvae of temperate northern hemisphere fishes are weak swimmers (Blaxter 1986, Miller et al 1988. Similarly, the swimming speeds of settlement-size sparids from Japan were relatively slow at about 2 to 3 BL s -1 (Fukuhara 1985(Fukuhara , 1987). Yet 13 mm SL Trachurus larvae in New Zealand sustained swimming speeds of up to 10 BL s -1 (Dudley et al 2000); this is the first record of fast swimming in temperate fish larvae.…”

Section: Introductionmentioning

confidence: 99%

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Behaviour of settlement-stage larvae of fishes with an estuarine juvenile phase: in situ observations in a warm-temperate estuary

Trnski¹

2002

Mar. Ecol. Prog. Ser.

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Observations of behaviour were made on a total of 103 settlement-stage larvae (9 to 15 mm standard length [SL]) of 4 species of estuary-dependent fishes in Lake Macquarie, a barrier estuary on the central coast of New South Wales, Australia. Larvae were released at mid-depth over deep water or within sight of settlement habitat, and their behaviour was observed by SCUBA divers. ) for Pagrus auratus (all family Sparidae) and 12.5 cm s -1 (11.2 BL s -1 ) for Girella tricuspidata (Girellidae). These speeds were faster than previously recorded for temperate fish larvae. It is hypothesised that body morphology determines swimming ability. At these speeds, the larvae are faster than ambient currents. The majority of larvae of all species swam in a directional (non-random) manner, but there was no evidence that the larvae were orienting to the shoreline or the sun. There were species-specific differences in depth profile: the 3 species that settle in seagrass beds preferentially swam near the surface; P. auratus, which settles over soft bottoms, preferentially swam to the bottom. Swimming near the surface in Lake Macquarie brings larvae into strong wind-driven surface currents that carry them to a shoreline and settlement habitat. Larvae of only G. tricuspidata (1 of 3 species that settle in seagrass) were rarely observed to settle when they were released within sight of a seagrass margin.

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Section: Discussionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Behaviour of settlement-stage larvae of fishes with an estuarine juvenile phase: in situ observations in a warm-temperate estuary

Trnski¹

2002

Mar. Ecol. Prog. Ser.

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“…The lower predation rates on larger fish larvae by moon jellyfish at the higher oxygen concentrations examined in the present study suggest that the larger fish larvae were more able to avoid predation by the moon jellyfish. Swimming speed has been reported to rapidly increase in red sea bream larvae Ͼ6 mm in standard length under laboratory conditions (Fukuhara 1985). Time elapsed before capture by a moon jellyfish significantly increased in red sea bream larvae Ͼ7 mm (Nakayama et al 2003).…”

Section: Discussionmentioning

confidence: 99%

Non-size-selective predation on fish larvae by moon jellyfish Aurelia aurita under low oxygen concentrations

Shoji

2008

Plankton Benthos Res

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Abstract:The moon jellyfish Aurelia aurita has increased in abundance in coastal waters around Japan during recent decades. Since the moon jellyfish is highly tolerant of low dissolved oxygen concentrations, predation impacts by moon jellyfish on zooplankton can increase during summer hypoxia in coastal waters, which is often caused by anthropogenic effects such as an increase in nutritional loading from the land. Laboratory experiments were conducted in order to test the hypothesis that summer hypoxia leads to qualitative changes in predator-prey interactions between moon jellyfish and larval fish. Larvae of a common coastal fish, red sea bream Pagrus major (2.9, 4.1, 6.2 and 8.6 mm in standard length), were used for the experiments. Predation rates (% of larvae preyed on by a moon jellyfish per 10 min.) were examined at four oxygen concentrations (1, 2, 4 and 5.8 mg L Ϫ1 ) in 10 L tanks (4 replicates). Size-selective predation was observed at the two highest oxygen concentrations (4 and 5.8 mg L Ϫ1 ): about half of the 6.2 and 8.6 mm larvae survived the 10 min. trials while more than 85% of the 2.9 and 4.1 mm larvae were captured. Larval body size did not affect the predation rates at the two lowest oxygen concentrations (1 and 2 mg L Ϫ1 ): more than 90% of larvae in all size classes were caught. These results indicate that trophic flow from ichthyoplankton to moon jellyfish increases during summer hypoxia in coastal waters and a qualitative change in predator-prey interaction, i.e., shift from size-selective to non-sizeselective predation occurs at oxygen concentrations Ͻ2 mg L Ϫ1.

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“…Many species, especially perciform, resorb their median finfold completely before a total body length (TL) of 8mm is reached [e.g. Pagrus major (Fukuhara, 1985)], while others retain a median finfold at TL>35mm [e.g. Thymallus thymallus (Penáz, 1975)].…”

Section: Introductionmentioning

confidence: 99%

Structure and function of the median finfold in larval teleosts

Boogaart

Müller

Osse

2012

Journal of Experimental Biology

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SUMMARYThis paper offers a structural and mechanical analysis of the median finfold in larval teleosts. The median finfold is strengthened by bundles of collagen fibres, known as actinotrichia. We demonstrate that these structures contribute to increase the mass of backward accelerated water during swimming. The amount, dimensions, orientation and growth of actinotrichia were measured at various locations along the finfold in several developmental stages of common carp (Cyprinus carpio) and zebrafish (Danio rerio). Actinotrichia morphology, using light microscopy (e.g. diameter, orientation) and electron microscopy (which revealed their anchoring at proximal and distal ends), correlated with expected lateral forces exerted on the water during swimming. An analytical model is proposed that predicts the extent of camber from the oblique arrangement of the actinotrichia and curvature of the body. Camber of the finfold during swimming was measured from high-speed video recordings and used to evaluate the model predictions. Based on structural requirements for swimming and strain limits for collagen, the model also predicts optimal orientations of actinotrichia. Experimental data confirm the predictions of the model.

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Functional morphology and behavior of early life stages of red sea bream.

Cited by 56 publications

References 0 publications

Behaviour of settlement-stage larvae of fishes with an estuarine juvenile phase: in situ observations in a warm-temperate estuary

Behaviour of settlement-stage larvae of fishes with an estuarine juvenile phase: in situ observations in a warm-temperate estuary

Non-size-selective predation on fish larvae by moon jellyfish Aurelia aurita under low oxygen concentrations

Structure and function of the median finfold in larval teleosts

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