Intensive rearing system for fish larvae research

Kolkovski, Sagiv; Curnow, John; King, J. O. L.

doi:10.1016/j.aquaeng.2004.05.004

Cited by 34 publications

(14 citation statements)

References 16 publications

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“…Algae and rotifers were automatically supplied at 15‐min intervals by a feeding system (Kolkovski et al. 2004), while enriched Artemia were manually supplied three times daily and microdiet was manually administered at intervals of 30 min to 1 h. A secchi depth of average 68 ± 17 cm was maintained for green water and algae density was reduced proportionately as the rotifer numbers were reduced according to the protocol (Fig.…”

Section: Methodsmentioning

confidence: 99%

Effects of two commercial microdiets on growth and survival of barramundi (Lates calcarifer Bloch) larvae within various early weaning protocols

Curnow

King

Partridge

et al. 2006

Aquaculture Nutrition

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Because of high costs and labour requirements along with the highly variable nutritional value of live feeds, we investigated the possibility of early weaning for barramundi (Lates calcarifer Bloch) larvae aimed at reducing the use of Artemia. Two commercial microdiets, Gemma Micro (Skretting, Australia) and Proton (INVE, Belgium) were compared for growth and survival of larvae using three weaning protocols, until 33 days posthatch (dph). Enriched rotifers were fed to larvae in all protocols through mouth opening until 21, 18 and 30 dph (protocols 1, 2 and 3, respectively). At 13 dph, enriched Artemia metanauplii were introduced to weaning protocols 1 and 2, and continued until 29 and 24 dph, respectively, whereas protocol 3 did not receive Artemia. Microdiet was initiated at 20, 16 and 13 dph in protocols 1, 2 and 3, respectively. Barramundi larvae grew successfully to 33 dph when co‐fed rotifers and microdiet, and significantly larger larvae resulted from feeding Gemma Micro rather than Proton, when Artemia were not used. However, larvae weaned onto Proton using a longer period of Artemia provision were significantly larger than larvae reared according to all other protocols. Survival was significantly higher in all Gemma Micro protocols when compared with Proton protocols. This was in part due to higher cannibalism when using Proton compared with Gemma Micro (22.8 ± 0.9% and 9.2 ± 0.6%, respectively). Cannibalism became more noticeable in all protocols when the larvae reached 7–8 mm standard length and further increased after the cessation of live feed. Tank biomass production was the highest when larvae were weaned onto Gemma Micro including a short period of Artemia provision as a result of a combination of high growth and survival. However, similar biomass production resulted when larvae were weaned directly from rotifers onto Gemma Micro and/or from a prolonged Artemia period onto proton. The success of weaning barramundi larvae directly to microdiet from rotifers, thus eliminating the need for Artemia, was influenced by the microdiet. Relatively higher levels of free amino acids and lipids were believed to contribute to increasing larval growth and survival. Larvae that were fed Gemma Micro showed higher growth when Artemia were utilized for a shorter period, while Proton‐fed larvae benefited from an extended Artemia feeding period.

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Section: Methodsmentioning

confidence: 99%

Effects of two commercial microdiets on growth and survival of barramundi (Lates calcarifer Bloch) larvae within various early weaning protocols

Curnow

King

Partridge

et al. 2006

Aquaculture Nutrition

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“…1). Systems for automatic feeding have been presented by other authors (Kolkovski, Curnow, & King, 2004;Papandroulakis, Dimitris, & Pascal, 2002;Rabe & Brown, 2000), but these are feed-forward systems only. In feed-forward systems, the rotifer density observed in the tanks is a direct consequence of the feed addition rate used, due to the strong interdependency of feed supply and density.…”

Section: Introductionmentioning

confidence: 98%

Automatic control of rotifer density in larval first feeding tanks

Alver

Tennøy

Alfredsen

et al. 2008

Control Engineering Practice

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“…For heating of ground water to 18 ± 1°C a thermal heat pump in combination with a degassing column was used. Water was degassed to avoid its oversaturation with nitrogen gas which is harmful to eggs and larvae (Kolkovski et al 2004). Cooling of ground water to 4°C was done with a cooling aggregate Aqua Medic Titan 2000 (Aqua Medic GmbH, Germany).…”

Section: Methodsmentioning

confidence: 99%

Digestive enzyme system of larvae of different freshwater teleosts and its differentiation during the initial phase of exogenous feeding

Lahnsteiner¹

2017

CZECH J ANIM SCI

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Lahnsteiner F. (2017): Digestive enzyme system of larvae of different freshwater teleosts and its differentiation during the initial phase of exogenous feeding. Czech J. Anim. Sci., 62, 403-416.Activities of digestive enzymes and main histological characteristics of the intestine were investigated in larvae of three salmonid species (Coregonus maraena, C. atterensis, Thymallus thymallus), of burbot (Lota lota), and pikeperch (Sander lucioperca) at the onset of exogenous feeding (0 day degrees (°d)) and at 250°d thereafter. At the onset of exogenous feeding the activities of proteolytic, lipolytic, and carbohydrate splitting enzymes were detected in the intestines of all species. The enzymatic activities showed significant species specific differences indicating specializations in functionality and digestion ability. In C. atterensis and L. lota the activities of most enzymes were low in comparison to the other investigated species and therefore their digestive system was only poorly developed. In S. lucioperca it was moderately developed and in T. thymallus and C. maraena well-developed. After 250°d, the activities of the investigated enzymes changed in a very species specific way. Histologically, the intestines of the investigated species revealed no species specific differentiations at the onset of the first feeding with the exception of the absence of goblet cells in L. lota and C. atterensis. These differentiated after 250°d.

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Intensive rearing system for fish larvae research

Cited by 34 publications

References 16 publications

Effects of two commercial microdiets on growth and survival of barramundi (Lates calcarifer Bloch) larvae within various early weaning protocols

Effects of two commercial microdiets on growth and survival of barramundi (Lates calcarifer Bloch) larvae within various early weaning protocols

Automatic control of rotifer density in larval first feeding tanks

Digestive enzyme system of larvae of different freshwater teleosts and its differentiation during the initial phase of exogenous feeding

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