Light Intensity and Salinity Effects on Eggs and Yolk Sac Larvae of the Summer Flounder

Watanabe, Wade O.; Feeley, Michael W.; Ellis, Simon

doi:10.1577/1548-8640(1998)060<0009:liaseo>2.0.co;2

Cited by 25 publications

(18 citation statements)

References 33 publications

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“…In species such as the southern flounder P. lethostigma (Henne and Watanabe 2003) and summer flounder P. dentatus (Watanabe et al 1998), growth and survival have been optimal in seawater. However, in turbot (Scophthalmus maximus), the best growth and food conversion were observed in intermediate salinities (Imsland et al 2003), corroborating the hypothesis of increased growth rate of fish reared near to their isosmotic point (Imsland et al 2001).…”

Section: Discussionmentioning

confidence: 99%

Increased growth hormone (GH), growth hormone receptor (GHR), and insulin-like growth factor I (IGF-I) gene transcription after hyperosmotic stress in the Brazilian flounder Paralichthys orbignyanus

Meier

Figueiredo

Kamimura

et al. 2008

Fish Physiol Biochem

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Growth hormone (GH) action is the result of an intracellular cascade initiated just after its interaction with the growth hormone receptor (GHR) located on the surface of target cells. This cascade culminates with the transcription of target genes, such as the insulin-like growth factors (IGFs), which are responsible for most GH biological effects. In addition to its central role in growth, fish GH is also involved with osmoregulatory control. Within this context, the objective of the present work was to isolate GH, GHR, and IGF-I cDNAs from the Brazilian flounder Paralichthys orbignyanus and evaluate whether these genes are induced by hyperosmotic stress. The obtained results indicated that GH mRNA had a significant peak only 24 h after hyperosmotic stress. In gills, GHR mRNA was significantly increased after 7 days. In liver, GHR and IGF-I mRNAs were significantly increased in 72 h and both reached even higher levels after 7 days. These results indicate that hyperosmotic stress can increase GH sensitivity in the gills and liver of P. orbignyanus and, consequently, improve IGF-I production. The management of this parameter could be useful in achieving better growth performance for this and other commercially important species in which GH has a direct correlation with osmoregulatory mechanisms.

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Section: Discussionmentioning

confidence: 99%

Increased growth hormone (GH), growth hormone receptor (GHR), and insulin-like growth factor I (IGF-I) gene transcription after hyperosmotic stress in the Brazilian flounder Paralichthys orbignyanus

Meier

Figueiredo

Kamimura

et al. 2008

Fish Physiol Biochem

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“…Marine fish larvae are visual feeders and are highly dependent on light (Blaxter 1968) for prey capture and feeding success. Although light can have important effects on growth and survival of the early life stages of marine finfish (Watanabe, Feeley, Ellis & Ellis 1998; Henne & Watanabe 2003), these effects vary significantly among species (Boeuf & LeBail 1999). In a number of species, such as Nassau grouper, Epinephelus striatus (Bloch) (Ellis, Watanabe, Ellis, Ginoza & Moriwake 1997), striped bass, Morone saxatilis (Walbaum) (Chesney 1989), and Atlantic cod, Gadus morhua (Linnaeus) (Puvanendran & Brown 2002), increased light intensities (1636–2400 lx) produced positive phototaxis, and increased feeding, survival and growth of larvae.…”

Section: Introductionmentioning

confidence: 99%

“…In a number of species, such as Nassau grouper, Epinephelus striatus (Bloch) (Ellis, Watanabe, Ellis, Ginoza & Moriwake 1997), striped bass, Morone saxatilis (Walbaum) (Chesney 1989), and Atlantic cod, Gadus morhua (Linnaeus) (Puvanendran & Brown 2002), increased light intensities (1636–2400 lx) produced positive phototaxis, and increased feeding, survival and growth of larvae. On the other hand, in summer flounder, Paralichthys dentatus (Linnaeus) (Watanabe et al . 1998), and in southern flounder, P. lethostigma (Jordan & Gilbert) (Henne & Watanabe 2003), maximum larval growth was observed at relatively low light intensities (50–500 lx).…”

Section: Introductionmentioning

confidence: 99%

Light intensity effects on early life stages of black sea bass, Centropristis striata (Linnaeus 1758)

Copeland

Watanabe

2006

Aquaculture Res

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The effects of four light intensities on growth and survival of first‐feeding stage black sea bass larvae Centropristis striata were investigated in a controlled‐environment laboratory. Fertilized eggs, obtained from LHRHa‐induced spawning of captive broodstock, were stocked (72 eggs L−1) into twenty 15 L black tanks under light intensities of 100, 500, 1000 and 1500 lx, with five replicate tanks per treatment. The photoperiod was 12L:12D, the temperature was 20°C and the salinity was 35 g L−1. Larvae were fed rotifers Brachionus rotundiformis from day 2 post‐hatching (d 2ph) at 5–10 rotifers mL−1. Microalgae Nannochloropis oculata and Isochrysis sp. were added (1:1) daily to maintain a density of 300 000 cells mL−1. Hatching success and larval growth and survival from d 2ph through d 15ph were monitored. Hatching success was 28–38% under all light intensities, and notochord length at hatching ranged from 2.8 to 3.0 mm, with no significant differences among treatments. By d 15ph, growth (mg wet weight) was significantly higher in the 1000 lx (0.914) and 1500 lx treatments (0.892) than in 100 lx (0.483), and a highly significant trend (P<0.01) towards increased survival with increasing light intensities was observed, from 1.3% at 100 lx to 13.9% at 1500 lx. Higher light intensities within the range of 100–1500 lx improved growth and survival of early larval black sea bass, suggesting that even higher light intensities may improve culture performance. This is consistent with conditions in shallow, near‐shore locations where eggs and larvae are distributed in nature.

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“…Changes in standard length (L S ) through endogenous feeding have been used as a relative measure of yolk conversion efficiency (Watanabe et al 1998), and allow inferences to be made on larval conditions in combination with other measured characters (Reichow et al 1991). Rogers & Westin (1981) suggested that tissues of striped bass larvae may be mobilized for metabolic demands before the oil globule is completely consumed, indicating a strategy of lipid conservation.…”

Section: Introductionmentioning

confidence: 99%

Development, growth, and yolk utilization of hatchery-reared red snapper Lutjanus campechanus larvae

Williams¹,

Papanikos²,

Phelps³

et al. 2004

Mar. Ecol. Prog. Ser.

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The development of yolk-sac larvae of red snapper Lutjanus campechanus from endogenous utilization of nutrient sources to the development of feeding ability is described, with the aim of better understanding the high mortalities observed at first-feeding. Larvae from several spawns were reared at a salinity of 31 and a temperature of 28°C. Yolk utilization rate, changes in body parameters and the development of morphological characters were observed. Maximum standard length (L S ) and body depth were observed concurrently with yolk-sac exhaustion at 56 h postfertilization (hpf). A decrease in L S , body width and body depth was observed following yolk-sac exhaustion. Orbit pigmentation, followed by jaw articulation, were observed at 65 hpf. Substantial cranial and body cavity development occurred in the absence of visible yolk material. Complete absence of visible yolk-sac material and less than 2% of the oil globule volume at hatching were observed at the time of development of feeding ability. This indicates an absence of a transitional feeding period and the critical nature of first-feeding in this species within controlled environments. KEY WORDS: Red snapper · Larval development · Yolk utilization · Endogenous reservesResale or republication not permitted without written consent of the publisher

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Light Intensity and Salinity Effects on Eggs and Yolk Sac Larvae of the Summer Flounder

Cited by 25 publications

References 33 publications

Increased growth hormone (GH), growth hormone receptor (GHR), and insulin-like growth factor I (IGF-I) gene transcription after hyperosmotic stress in the Brazilian flounder Paralichthys orbignyanus

Increased growth hormone (GH), growth hormone receptor (GHR), and insulin-like growth factor I (IGF-I) gene transcription after hyperosmotic stress in the Brazilian flounder Paralichthys orbignyanus

Light intensity effects on early life stages of black sea bass, Centropristis striata (Linnaeus 1758)

Development, growth, and yolk utilization of hatchery-reared red snapper Lutjanus campechanus larvae

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