Size Fluctuation in The Eggs and Newly Hatched Larvae of Captive Turbot (Scophthalmus Maximus)

1991 ◽  
Vol 71 (3) ◽  
pp. 679-690 ◽  
Author(s):  
Lesley Ann Mcevoy ◽  
John Mcevoy
Keyword(s):  
Constant Temperature ◽  
Egg Size ◽  
Scophthalmus Maximus ◽  
Yolk Sac ◽  
Positive Correlation ◽  
Larval Length ◽  
Turbot Scophthalmus Maximus ◽  
Newly Hatched Larvae ◽  
Seasonal Decline

The aims of this study were to ascertain if individual turbot females show a seasonal decline in their egg-size when kept in conditions of constant temperature, and to relate turbot egg-size to the length and yolk-sac index of the emergent larva. Each female showed a significant seasonal egg-size decline and there was a positive correlation between egg-size and the length and yolk-sac index of the subsequent larva. However, larval length was not related to yolk-sac index, nor was the ratio of yolk-sac index: larval length related to egg-size. The maximum mean egg-size tended to increase with the female's weight and length. The implications of these findings are discussed in terms of the general ecology of turbot and its culture.

Ontogeny of the digestive enzymes, thyroid hormones and cortisol in developing embryos and yolk-sac larvae of turbot (Scophthalmus maximus L.)

Aquaculture ◽  
2017 ◽  
Vol 479 ◽  
pp. 704-711 ◽  
Author(s):  
Xuehong Tong ◽  
Xiaolan Yang ◽  
Chengman Bao ◽  
Xinhui Tang ◽  
Jialian Wang ◽  
...  
Keyword(s):  
Thyroid Hormones ◽  
Digestive Enzymes ◽  
Scophthalmus Maximus ◽  
Yolk Sac ◽  
Turbot Scophthalmus Maximus

Changes in Behaviour of Atlantic Halibut (Hippoglossus hippoglossus) and Turbot (Scophthalmus maximus) Yolk-Sac Larvae Induced by Bacterial Infections

1993 ◽  
Vol 50 (12) ◽  
pp. 2552-2557 ◽  
Author(s):  
Anne Berit Skiftesvik ◽  
Øivind Bergh
Keyword(s):  
Bacterial Infections ◽  
Fish Larvae ◽  
Early Stage ◽  
Scophthalmus Maximus ◽  
Yolk Sac ◽  
Atlantic Halibut ◽  
Hippoglossus Hippoglossus ◽  
Pathogenic Vibrio ◽  
Turbot Scophthalmus Maximus ◽  
Reduced Activity

Eggs of Atlantic halibut (Hippoglossus hippoglossus) and turbot (Scophthalmus maximus) were exposed to Flexibacter ovolyticus and pathogenic Vibrio sp. strains prior to, and during hatching. Activity, buoyancy and mortality of the yolk sac larvae were monitored from hatching until time of first feeding. The halibut larvae showed reduced activity and increased mortality in response to the challenge of bacteria, compared to uninfected control groups. In addition, the infected halibut larvae showed increased specific density compared to the uninfected larvae. These responses were not found for turbot. However, turbot larvae infected with Vibrio anguillarum had lower activity than larvae infected with F. ovolyticus. The reduced activity of halibut larvae occurred 1–2 weeks prior to the increased mortality, allowing infections to be detected at an early stage. The results suggest that the behaviour of fish larvae is influenced by bacterial infection.

scholarly journals Effect of temperature on yolk sac utilisation and growth of newly hatched larvae of cobia Rachycentron canadum (Linnaeus, 1766)

2016 ◽  
Vol 63 (3) ◽  
Author(s):  
M. Sakthivel ◽  
R. Jayakumar ◽  
A. K. Abdul Nazar ◽  
G. Tamilmani ◽  
P. Rameshkumar ◽  
...  
Keyword(s):  
Total Duration ◽  
Vital Role ◽  
Yolk Sac ◽  
Effect Of Temperature ◽  
Rachycentron Canadum ◽  
Temperature Range ◽  
Clear Cut ◽  
Larval Length ◽  
Newly Hatched Larvae ◽  
Temperature Levels

The effect of temperature on the utilisation of yolk-sac and growth in terms of length of the larvae of cobia Rachycentron canadum (Linnaeus, 1766) was investigated. Five temperature levels viz., 29, 30, 31, 32 and 33°C were experimented with the newly hatched larvae for a total duration of 52 hours post-hatch (hph). A clear-cut trend of increase in larval length with increase in temperature was noted. The maximum length recorded was 4.41±0.11 mm at 33°C by the end of the experiment. The yolk-sac volume decreased proportionately with rise in temperature. At the end of 52 hph, the lowest yolk-sac volume was recorded at temperature range of 31 to 33°C. Results of the present study suggest that temperature plays a vital role in the yolk-sac utilisation as well as on growth of cobia larvae.

Patterns of catabolic capacities and energy metabolism in developing embryos and yolk-sac larvae of turbot (Scophthalmus maximus L.)

Aquaculture ◽  
2017 ◽  
Vol 481 ◽  
pp. 177-183 ◽  
Author(s):  
Xuehong Tong ◽  
Lele Yang ◽  
Xinhui Tang ◽  
Xiaolan Yang ◽  
Chengman Bao ◽  
...  
Keyword(s):  
Energy Metabolism ◽  
Scophthalmus Maximus ◽  
Yolk Sac ◽  
Turbot Scophthalmus Maximus

Changes of biochemical compositions during development of eggs and yolk-sac larvae of turbot Scophthalmus maximus

Aquaculture ◽  
2017 ◽  
Vol 473 ◽  
pp. 317-326 ◽  
Author(s):  
Xuehong Tong ◽  
Xiaolan Yang ◽  
Chengman Bao ◽  
Jialian Wang ◽  
Xinhui Tang ◽  
...  
Keyword(s):  
Scophthalmus Maximus ◽  
Yolk Sac ◽  
Biochemical Compositions ◽  
Turbot Scophthalmus Maximus

Calorespirometry of developing embryos and yolk-sac larvae of turbot (Scophthalmus maximus)

1995 ◽  
Vol 122 (1) ◽  
pp. 157-163 ◽  
Author(s):  
R. N. Finn ◽  
J. Widdows ◽  
H. J. Fyhn
Keyword(s):  
Scophthalmus Maximus ◽  
Yolk Sac ◽  
Turbot Scophthalmus Maximus

The effect of acute changes in temperature and light on the aerobic metabolism of embryos and yolk-sac larvae of turbot (Scophthalmus maximus)

2003 ◽  
Vol 60 (11) ◽  
pp. 1324-1331 ◽  
Author(s):  
Roderick Nigel Finn ◽  
Ivar Rønnestad
Keyword(s):  
Amino Acids ◽  
Oxygen Consumption ◽  
Ammonia Excretion ◽  
Scophthalmus Maximus ◽  
Yolk Sac ◽  
Significant Shift ◽  
Temperature Changes ◽  
Rate Of Oxygen Consumption ◽  
Turbot Scophthalmus Maximus ◽  
Acute Changes

The effect of acute changes of temperature and light on the rates of oxygen consumption and ammonia excretion of developing embryos and yolk-sac larvae of turbot (Scophthalmus maximus) reared at 15 °C were studied. Short-term temperature adjustments of ±2 °C gave a mean Q10 of 2.6 for the rate of oxygen consumption. Neither the presence nor the absence of light significantly influenced this response to acute temperature changes, despite light causing a significantly higher rate of oxygen consumption in the yolk-sac larvae between 9 and 12 days after fertilisation. This elevated metabolic rate in the presence of light occurred after pigmentation of the eyes and was probably due to activity associated with food-searching behaviour of this visual feeder. Similarly, for most development, the presence or absence of light and acute temperature adjustments did not cause any significant shift in the relative fraction of amino acids catabolised at 15 °C. However, on day 10 after fertilisation when peak rates of oxygen consumption occurred in the yolk-sac larvae exposed to light, the significantly elevated apparent nitrogen quotients indicated that greater amounts of amino acids were utilised for catabolic substrate oxidation.

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