Visual field of cultured striped trumpeter<i>Latris lineata</i>(Teleostei) larvae feeding on rotifer prey

Cobcroft, JM; Pankhurst, Patricia M.

doi:10.1080/10236240600741224

Cited by 10 publications

(9 citation statements)

References 47 publications

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“…While cone density in A. rochei did not vary with the retinal region examined, the fact that cone outer segment lengths and rod densities were consistently greater in the dorsal region of the central retina, irrespective of developmental stage, suggests that the visual axis for lens accommodation may be forward-and downwardprojecting relative to the snout. This is consistent with the proposed visual axis of other shallow-water larval planktivores (Cobcroft & Pankhurst 2006).…”

Section: Vision Enhancementsupporting

confidence: 80%

Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs

Morote

Olivar²,

Pankhurst³

et al. 2008

Mar. Ecol. Prog. Ser.

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The bullet tuna Auxis rochei, Risso 1810, is a small tuna widely distributed in tropical and temperate Seas. The present study reports on the first attempt to jointly monitor diet and food selection in larvae of this species and to assess the influence of the ontogenetic development of feeding-related organs on the diet. A. rochei larvae from 2 to 7 mm long are diurnal feeders and highly active predators, with high values of feeding incidence, gut fullness and number of ingested prey items. The rate of change in prey item size in relation to larval size was higher than in other species. Only small, non-motile prey items are eaten at the onset of feeding. Rapid mouth development and the early appearance of teeth allow larvae from 3 to 5 mm long to ingest a wide range of prey. However, niche breadth decreases at 5 mm, when larvae avoid small prey items in favour of larger ones with a higher carbon content. Chesson's selectivity index indicated that small larvae (from 2 to 3 mm long) selected a variety of small prey items, mainly copepod nauplii. Larvae measuring 3 to 5 mm selectively ate cladocerans and appendicularians, and larvae with lengths ≥5 mm preferred appendicularians and fish larvae. Precocious body development (mouth, teeth, and onset of stomach and caudal fin development) and improved visual acuity (larger lens diameter and angular cone density) are factors that contribute to the feeding success of larvae of this species.

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Section: Vision Enhancementsupporting

confidence: 80%

Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs

Morote

Olivar²,

Pankhurst³

et al. 2008

Mar. Ecol. Prog. Ser.

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“…Although taste buds may be present at the opening of the mouth in some species, they usually proliferate days or weeks after the onset of feeding (Boglione et al . ; Cobcroft & Pankhurst ; Sánchez‐Amaya et al . ); their implication in the food acceptation is thus more relevant at later stages, e.g.…”

Section: Feeding Behaviour and Appetitementioning

confidence: 99%

Feeding behaviour and digestive physiology in larval fish: current knowledge, and gaps and bottlenecks in research

Rønnestad

Yúfera

Ueberschär

et al. 2013

Reviews in Aquaculture

391

327

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Food uptake follows rules defined by feeding behaviour that determines the kind and quantity of food ingested by fish larvae as well as how live prey and food particles are detected, captured and ingested. Feeding success depends on the progressive development of anatomical characteristics and physiological functions and on the availability of suitable food items throughout larval development. The fish larval stages present eco-morpho-physiological features very different from adults and differ from one species to another. The organoleptic properties, dimensions, detectability, movements characteristics and buoyancy of food items are all crucial features that should be considered, but is often ignored, in feeding regimes. Ontogenetic changes in digestive function lead to limitations in the ability to process certain feedstuffs. There is still a lack of knowledge about the digestion and absorption of various nutrients and about the ontogeny of basic physiological mechanisms in fish larvae, including how they are affected by genetic, dietary and environmental factors. The neural and hormonal regulation of the digestive process and of appetite is critical for optimizing digestion. These processes are still poorly described in fish larvae and attempts to develop optimal feeding regimes are often still on a 'trial and error' basis. A holistic understanding of feeding ecology and digestive functions is important for designing diets for fish larvae and the adaptation of rearing conditions to meet requirements for the best presentation of prey and microdiets, and their optimal ingestion, digestion and absorption. More research that targets gaps in our knowledge should advance larval rearing.

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“…Compared to symmetrical teleosts that have primarily monocular visual fields of c . 180° anteriorly (Cobcroft & Pankhurst, 2006), the few visually oriented flatfish species that have been studied have visual fields approaching 360°, with a binocular field of view of c . 40° anteriorly (Fujimoto et al , 1992).…”

Section: Introductionmentioning

confidence: 99%

Which way to turn? Effect of direction of body asymmetry on turning and prey strike orientation in starry flounder Platichthys stellatus (Pallas) (Pleuronectidae)

Bergstrom

Palmer

2007

Journal of Fish Biology

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Starry flounder Platichthys stellatus, a rare polymorphic flatfish exhibiting a large-scale geographic cline in the frequency of right-eyed (dextral) and left-eyed (sinistral) morphs, was studied to investigate whether foraging behaviour (turning angle and prey strike orientation) differed between dextral and sinistral laboratory-raised juveniles. Platichthys stellatus foraging on brine shrimp Artemia sp. nauplii tended to strike dorsally at prey ('left' to an observer for dextral flounder and 'right' to an observer for sinistral flounder), although this effect was stronger for sinistral fish. This dorsal tendency also increased with body size. Non-strike behaviours (movements between strikes) were ventrally biased for both morphs. Maximum turn angles were larger for both morphs towards the dorsal side than the ventral side during prey strikes but were the same during non-strike behaviours. The positioning of the eyes of the juvenile starry flounder was skewed towards the dorsal midline rather than being symmetrically placed between dorsal and ventral margins on the eyed side of each fish. The migrating eyes of dextral fish, however, were significantly closer to the dorsal midline than in sinistral fish. This, in addition to the more dorsally oriented prey strikes in sinistral fish, suggests that the morphs are not simple behavioural mirror images of one another and therefore may differ ecologically.

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Visual field of cultured striped trumpeterLatris lineata(Teleostei) larvae feeding on rotifer prey

Cited by 10 publications

References 47 publications

Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs

Trophic ecology of bullet tuna Auxis rochei larvae and ontogeny of feeding-related organs

Feeding behaviour and digestive physiology in larval fish: current knowledge, and gaps and bottlenecks in research

Which way to turn? Effect of direction of body asymmetry on turning and prey strike orientation in starry flounder Platichthys stellatus (Pallas) (Pleuronectidae)

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