scholarly journals FLUORESCENT LAMP LIGHT INTENSITY ON THE EMBRYOGENESIS DEVELOPMENT AND THE SURVIVAL OF PEARL OYSTER (Pinctada maxima) LARVAE

2013 ◽  
Vol 5 (2) ◽  
Author(s):  
Mat Sardi Hamzah
Keyword(s):  
Survival Rate ◽  
Light Intensity ◽  
Pearl Oyster ◽  
Larval Rearing ◽  
Fluorescent Lamp ◽  
Brood Stock ◽  
Dark Treatment ◽  
Light Intensities ◽  
Significant Difference ◽  
Pinctada Maxima

<p>One of the important factors in determining the success of pearl oyster (Pinctada maxima) culture is the quality and quantity of larvae produced in brood stock spawning process in the laboratory. Problems were often found in larval rearing and larvae attachment to the substrate that were low in quality and little number of larvae. The study purposes were observe the embryogenesis development and the survival rate of pearl oyster larvae under different fluorescent lamp light intensities. The study was conducted in August 1<sup>nd</sup> – 30<sup>th</sup>, 2011 in Sambelia Bumi Gemilang Hamparan Mutiara laboratory, East Lombok. Results revealed that different in light intensities effected the survivorship of the pearl oyster larvae significantly (p&lt;0.01). Honest Significant Difference (HSD) test indicated that the highest survival rate occurred in dark condition (dark treatment) of 38%, followed by intensity of 10 watts (34.67%), 5 watts (30.67%) and 15 watts (4.66%) resfectively</p> <p>Keywords: embryogenesis development, survivorship, pearl oyster (<span style="text-decoration: underline;">Pinctada</span> <span style="text-decoration: underline;">maxima</span>) larvae,  fluorescent lamp light intensity</p>

scholarly journals FLUORESCENT LAMP LIGHT INTENSITY ON THE EMBRYOGENESIS DEVELOPMENT AND THE SURVIVAL OF PEARL OYSTER (Pinctada maxima) LARVAE

2013 ◽  
Vol 5 (2) ◽  
Author(s):  
Mat Sardi Hamzah
Keyword(s):  
Survival Rate ◽  
Light Intensity ◽  
Pearl Oyster ◽  
Larval Rearing ◽  
Fluorescent Lamp ◽  
Brood Stock ◽  
Dark Treatment ◽  
Light Intensities ◽  
Significant Difference ◽  
Pinctada Maxima

One of the important factors in determining the success of pearl oyster (Pinctada maxima) culture is the quality and quantity of larvae produced in brood stock spawning process in the laboratory. Problems were often found in larval rearing and larvae attachment to the substrate that were low in quality and little number of larvae. The study purposes were observe the embryogenesis development and the survival rate of pearl oyster larvae under different fluorescent lamp light intensities. The study was conducted in August 1nd – 30th, 2011 in Sambelia Bumi Gemilang Hamparan Mutiara laboratory, East Lombok. Results revealed that different in light intensities effected the survivorship of the pearl oyster larvae significantly (p<0.01). Honest Significant Difference (HSD) test indicated that the highest survival rate occurred in dark condition (dark treatment) of 38%, followed by intensity of 10 watts (34.67%), 5 watts (30.67%) and 15 watts (4.66%) resfectively Keywords: embryogenesis development, survivorship, pearl oyster (Pinctada maxima) larvae,  fluorescent lamp light intensity

scholarly journals THE EFFECT OF SEASONS AND DEPTHS ON GROWTH AND SURVIVAL RATE OF PEARL OYSTER (Pinctada maxima) IN KODEK BAY, NORTH LOMBOK

2011 ◽  
Vol 3 (2) ◽  
Author(s):  
M. S. Hamzah ◽  
Bisman Nababan ◽  
Bisman Nababan
Keyword(s):  
Survival Rate ◽  
Seedling Survival ◽  
Pearl Oyster ◽  
Mass Mortality ◽  
Growth And Survival ◽  
Transition Season ◽  
Pearl Oysters ◽  
Significant Difference ◽  
Similar Survival ◽  
Pinctada Maxima

The pearl oyster (Pinctada maxima) farming in the West Nusa Tenggara waters in particular and in other areas, complained to the mass mortality of pearl oysters saplings on shell width between 3-4 cm. The mass mortality, allegedly as a result of changing in environmental conditions and triggered by the shift in seasons. This research aimed to determine the effect of seasonal variations in water conditions at different depth levels on growth and survival of seedlings of pearl oysters conducted on March 23, 2008 to February 22, 2009. This research was very useful for pearl oyster farming in an effort to suppress the mass mortality rates based on the appropriate level of depth and seasons. Analysis of variance showed that the seasonal factors, the level of depth, and the interaction between both factors responded very significantly on pearl oyster seedling survival. The "significant difference test" showed that the interaction between season and level of 2 m depth provided the best result with 100% survival. The similar survival rate was also found at a depth of 8 m during the transition season I and the east season. For single factor (depth), the best result for growth and survival rate was found in 2 m deep during the transition season I.Keywords: Oyster sapling, Pinctada maxima, growth, mortality, season, depth, Kodek Bay

scholarly journals THE EFFECT OF SEASONS AND DEPTHS ON GROWTH AND SURVIVAL RATE OF PEARL OYSTER (Pinctada maxima) IN KODEK BAY, NORTH LOMBOK

2011 ◽  
Vol 3 (2) ◽  
Author(s):  
M. S. Hamzah ◽  
Bisman Nababan ◽  
Bisman Nababan
Keyword(s):  
Survival Rate ◽  
Seedling Survival ◽  
Pearl Oyster ◽  
Mass Mortality ◽  
Growth And Survival ◽  
Transition Season ◽  
Pearl Oysters ◽  
Significant Difference ◽  
Similar Survival ◽  
Pinctada Maxima

<p>The pearl oyster (Pinctada maxima) farming in the West Nusa Tenggara waters in particular and in other areas, complained to the mass mortality of pearl oysters saplings on shell width between 3-4 cm. The mass mortality, allegedly as a result of changing in environmental conditions and triggered by the shift in seasons. This research aimed to determine the effect of seasonal variations in water conditions at different depth levels on growth and survival of seedlings of pearl oysters conducted on March 23, 2008 to February 22, 2009. This research was very useful for pearl oyster farming in an effort to suppress the mass mortality rates based on the appropriate level of depth and seasons. Analysis of variance showed that the seasonal factors, the level of depth, and the interaction between both factors responded very significantly on pearl oyster seedling survival. The "significant difference test" showed that the interaction between season and level of 2 m depth provided the best result with 100% survival. The similar survival rate was also found at a depth of 8 m during the transition season I and the east season. For single factor (depth), the best result for growth and survival rate was found in 2 m deep during the transition season I.</p><p>Keywords: Oyster sapling, Pinctada maxima, growth, mortality, season, depth, Kodek Bay</p>

scholarly journals Light intensity regulates phototaxis, foraging and righting behaviors of the sea urchin Strongylocentrotus intermedius

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e8001 ◽  
Author(s):  
Jiangnan Sun ◽  
Xiaomei Chi ◽  
Mingfang Yang ◽  
Jingyun Ding ◽  
Dongtao Shi ◽  
...  
Keyword(s):  
Light Intensity ◽  
Foraging Behavior ◽  
Sea Urchins ◽  
High Light Intensity ◽  
High Light ◽  
Strongylocentrotus Intermedius ◽  
Low Light ◽  
Low Light Intensity ◽  
Light Intensities ◽  
Significant Difference

Small sea urchins Strongylocentrotus intermedius (1–2 cm of test diameter) are exposed to different environments of light intensities after being reseeded to the sea bottom. With little information available about the behavioral responses of S. intermedius to different light intensities in the environment, we carried out an investigation on how S. intermedius is affected by three light intensity environments in terms of phototaxis, foraging and righting behaviors. They were no light (zero lx), low light intensity (24–209 lx) and high light intensity (252–2,280 lx). Light intensity had obvious different effects on phototaxis. In low light intensity, sea urchins moved more and spent significantly more time at the higher intensity (69–209 lx) (P = 0.046). S. intermedius in high light intensity, in contrast, spent significantly more time at lower intensity (252–690 lx) (P = 0.005). Unexpectedly, no significant difference of movement (average velocity and total distance covered) was found among the three light intensities (P > 0.05). Foraging behavior of S. intermedius was significantly different among the light intensities. In the no light environment, only three of ten S. intermedius found food within 7 min. In low light intensity, nine of 10 sea urchins showed successful foraging behavior to the food placed at 209 lx, which was significantly higher than the ratio of the number (two of 10) when food was placed at 24 lx (P = 0.005). In the high light intensity, in contrast, significantly less sea urchins (three of 10) found food placed at the higher light intensity (2,280 lx) compared with the lower light intensity (252 lx) (10/10, P = 0.003). Furthermore, S. intermedius showed significantly longer righting response time in the high light intensity compared with both no light (P = 0.001) and low light intensity (P = 0.031). No significant difference was found in righting behavior between no light and low light intensity (P = 0.892). The present study indicates that light intensity significantly affects phototaxis, foraging and righting behaviors of S. intermedius and that ~200 lx might be the appropriate light intensity for reseeding small S. intermedius.

scholarly journals Changing Host Plants Causes Structural Differences in the Parasitoid Complex of the Monophagous Moth Yponomeuta evonymella, but Does Not Improve Survival Rate

Insects ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 197 ◽  
Author(s):  
Łukowski ◽  
Janek ◽  
Baraniak ◽  
Walczak ◽  
Karolewski
Keyword(s):  
Survival Rate ◽  
Host Plant ◽  
Free Space ◽  
Total Mortality ◽  
Larval Rearing ◽  
Primary Host ◽  
New Host ◽  
Parasitoid Complex ◽  
Significant Difference ◽  
Enemy Free Space

Recently in Poland, cases of host expansion have frequently been observed in the typically monophagous bird-cherry ermine moth (Yponomeuta evonymella), which has moved from its native host plant, bird cherry (Prunus padus), to a new, widely distributed plant that is invasive in Europe, black cherry (P. serotina). We attempted to verify the reasons behind this host change in the context of the enemy-free space hypothesis by focusing on parasitoids attacking larval Y. evonymella on one of three host plant variants: The primary host, P. padus; initially P. padus and later P. serotina (P. padus/P. serotina); or the new host, P. serotina. This experiment investigated if changing the host plant could be beneficial to Y. evonymella in terms of escaping from harmful parasitoids and improving survival rate. We identified nine species of parasitoids that attack larval Y. evonymella, and we found that the number of parasitoid species showed a downward trend from the primary host plant to the P. padus/P. serotina combination to the new host plant alone. We observed a significant difference among variants in relation to the percentage of cocoons killed by specific parasitoids, but no effects of non-specific parasitoids or other factors. Total mortality did not significantly differ (ca. 37%) among larval rearing variants. Changing the host plant caused differences in the structure of the parasitoid complex of Y. evonymella but did not improve its survival rate. This study does not indicate that the host expansion of Y. evonymella is associated with the enemy-free space hypothesis; we therefore discuss alternative scenarios that may be more likely.

scholarly journals Control of Polychaetes by Dipping Infected Pearl Oyster on Different Salinity

2007 ◽  
Vol 3 (2) ◽  
pp. 47
Author(s):  
Yani Hadiroseyani ◽  
. Iswadi ◽  
Daniel Djokosetyanto
Keyword(s):  
Survival Rate ◽  
Key Words ◽  
Saline Water ◽  
Pearl Oyster ◽  
High Survival ◽  
High Survival Rate ◽  
Pearl Oysters ◽  
Pinctada Maxima

<p>Dip treatment on pearl oysters <em>(Pinctada maxima) </em>was conducted in different concentrations of saline water to eliminate boring polychaetes. Results shows that polychaetes leave the osyters which treated on saline water at 0 ppt, 45 ppt, and 60 ppt as long as 15 minutes each. It also shows that the oysters got high survival rate 7 days after the treatment.</p> <p>Key words : Polychaetes, pearl oyster, dipping, salinity</p> <p> </p> <p>ABSTRAK</p> <p>Pengendalian polikaeta pengebor dengan menggunakan berbagai konsentrasi larutan garam telah dilakukan pada tiram mutiara <em>(Pinctada maxima). </em>Berdasarkan jumlah polikaeta yang keluar, hasil percobaan ini menunjukkan bahwa perendaman dengan konsentrasi garam 0 ppt. 45 ppt, dan 60 ppt selama 15 menit lebih efektif dibandingkan pada konsentrasi 15 dan 30 ppt. Tingkat kelangsungan hidup tiram mutiara yang diamati 7 hari setelah perendaman dalam larutan garam mencapai 100%.</p> Kata kunci : Polikaeta. tiram mutiara, perendaman. salinitas

scholarly journals Larval growth and survival in Indian Butter Catfish, Ompok bimaculatus (Bloch): effect of light intensity and photoperiod

2019 ◽  
Author(s):  
Kalpana Arambam ◽  
Pradyut Biswas ◽  
Soibam Khogen Singh ◽  
A. B. Patel ◽  
Alok Kumar Jena ◽  
...  
Keyword(s):  
Light Intensity ◽  
Larval Growth ◽  
Maximum Growth ◽  
Continuous Darkness ◽  
Growth And Survival ◽  
Light Intensities ◽  
Randomized Design ◽  
Significant Difference ◽  
Ompok Bimaculatus ◽  
Effect Of Light

AbstractTwo sequential indoor rearing trials each of 21 days duration were conducted to investigate the effect of light intensity and photoperiod respectively on the growth and survival of Ompok bimaculatus larvae. In first trial, five different light intensities viz. 0, 300, 500, 900, 1200 lx were applied randomly to 800 larvae (0.003 g; 0.51 cm) stocked in triplicate following a completely randomized design into aquarium (30.0 x 15.0 x 15.0 cm) tanks. Sequentially, in second trial, five photoperiod cycles (light: dark, L: D) namely, 24L: 0D, 16L: 8D, 12L: 12D, 8L: 16D and 0L: 24D in combination with the best performing light intensity (300 lx) as observed from the first trial were employed in triplicates in similar set up. From the first trial, significantly higher survival was observed in 0 and 300 lx, whereas growth was highest in 900 lx (P < 0.05). In the second trial, survival was higher in continuous darkness (0L: 24D), whereas, maximum growth was recorded in 24L: 0D and 16L: 8D groups (P < 0.05). Performance index (PI) showed no significant difference (P > 0.05) among 0 and 300 lx light intensities, but were reduced at higher light intensities. The lowest PI was found in 12L: 12D and 8L: 16D condition but did not have any effect in other photoperiod cycles. Overall, from the present study it can be concluded that growth of the larvae is found to be higher in higher light intensity (900lx) and longer photoperiodic cycles (24L: 0D and 16L: 8D), however, better survival was recorded in total dark conditions suggesting that continuous dark condition is recommended for better hatchery performance of the larvae.

Effect of light and humus on survival and height growth of ash (Fraxinus excelsior L.) seedlings

1998 ◽  
Vol 63 ◽  
Author(s):  
M. Tabari ◽  
M. Lust ◽  
J. Neirynck
Keyword(s):  
Survival Rate ◽  
Light Intensity ◽  
Growing Season ◽  
Height Growth ◽  
Fraxinus Excelsior ◽  
High Survival ◽  
Light Intensities ◽  
Stem Quality ◽  
Humus Type ◽  
Closed Canopy

In  1997, 300 3-month-old ash (Fraxinus excelsior L.) seedlings were removed out of the three    different humus types (100 seedlings from each humus type) in the  experimental forest of    Aelmoeseneie (University of Ghent) with a closed canopy, in north of  Belgium. Humus types were    described as active mull with pH of 5.3-6.5, acid mull with pH of 4.4-5.2  and moder mull with pH of    3.8-4.3. Seedlings were transplanted in plastic pots, filled by the  original soil, and placed under five    levels of light intensity (2.5, 10, 18,28 and 92%), inside and outside the  forest. Only with 92% light    intensity seedlings were watered as necessary to avoid any appreciable  water deficit.    The results after 1 growing season revealed that seedlings attained a very  high survival rate    (95.3%). Survival was the highest when seedlings grew under semi-closed  canopy (10, 18, and    28%) and also outside the forest at the 92% light intensity, compared with  those under closed    canopy (2.5%). It also confirmed that ash seedlings are shade tolerant, but  with little growth.    Height growth indicated an increasing growth response to nutrient  availability with increasing light    intensity. In fact, minimum height growth was observed in lower light  intensities (2.5 and 10%) and    the maximum value in higher light intensities (28 and 92%). Height growth  of ash seedlings    increased at humus types of active and acid mull, compared with moder  mull.    At the end of the first growing season, lack of differences in survival  rate and height growth,    produced under 18, 28 and 92% light intensity, revealed that training the  seedlings under semiclosed    canopy (18 and 26%) has a preference to those under relatively full  daylight (92%)    associated with watering. Therefore, the first year observations showed  that ash seedlings, either in    view of stem quality and growth or with regard to the facilities of  maintenance, are preferable to be    trained under intermediate light intensities (preferably 28%), at the high  nutritional humus (active    and acid mull).

scholarly journals Effect of Light Intensities on Growth Performance of Tetrapleura tetraptera Seedlings Schum. (Thonn.)

2021 ◽  
Vol 25 (1) ◽  
pp. 93-97
Author(s):  
O.D. Ayeni ◽  
Q.A. Onilude ◽  
P.J. Adekola ◽  
B.M. Awosusi ◽  
N.C. Mba ◽  
...  
Keyword(s):  
Light Intensity ◽  
Plant Height ◽  
Mesh Size ◽  
Wire Mesh ◽  
Leaf Production ◽  
Mean Values ◽  
Light Intensities ◽  
Significant Difference ◽  
Tetrapleura Tetraptera ◽  
The Mean

The study assessed the effect of varying light intensities and optimum percentage of sunlight favourable for raising Tetrapleura tetraptera seedlings. The light intensity was measured through photometer. The experiment was subjected to a control without wire mesh(T1) and three other treatments (T2, T3 and T4) covered with different layers of black wire mesh with 99.5%, 75%, 49.8% and 25% light intensities respectively. Each of the treatments was replicated six times in a completely randomized design. The plant height, leaf production and stem diameter were all monitored for 12 weeks. Analysis of Variance (ANOVA) was employed and the means separated using Least Significant Difference (LSD). The results showed that the significance effect (P = α0.05) was only observed in the seedlings height of Tetrapleuratetrapteraseedlings. However, the mean values obtained for all the parameters considered revealed the treatment 1(i.e. 99.8% wire mesh) was observed to be the best performing treatment. For the plant height, mean value ranged between 13.09 cm and 16.8 cm, a range from 0.22cm to 0.28mm was recorded for stem girth while the mean values between 22 and 27 were obtained for number of leaves among the treatments. It may be concluded from the study, that light intensity of 100% i.e without interference should be used for the growth and development as well as production of Tetrapleura tetraptera seedlings in the nursery. Keywords: Growth development, light intensities, Tetraplura tetreptera seedlings, wire mesh size

scholarly journals Kelangsungan Hidup Larva Ikan Nila yang Berasal Dari Induk yang Diberi Pakan Berimunostimulan

2014 ◽  
Vol 2 (3) ◽  
Author(s):  
Ayu Maleko ◽  
Hengky J Sinjal ◽  
Henky Manoppo
Keyword(s):  
Survival Rate ◽  
Nile Tilapia ◽  
Research Result ◽  
Baker’S Yeast ◽  
Larval Rearing ◽  
Baker's Yeast ◽  
Brood Stock ◽  
Larval Quality ◽  
Different Doses ◽  
Increase Survival Rate

The objective of this research was to evaluate the effect of feed supplemented with baker’s yeast on survival rate of nile tilapia larvae and to determine the effective dose of baker’s yeast that could optimally improve larval quality.  The research was conducted at Pathology and Clinic of Fish Disease from June – September 2014.  Fish as brood stock candidates was cultivated at five concrete tanks (2x1x1 m3) at a density of 30 fish per tank.  Each tank was equipped with water inlet, outlet and water pump for recirculating and aerating.  After seven days of adaptation, fish was fed pellet supplemented with baker’s yeast at five different doses (0, 10, 20, 30, 40 g/kg food) for four consecutive weeks at 4%/bb/day, twice daily.  Larva was captured with seser and moved into five glass aquaria with density of 20 larvae/aquarium and reared for two weeks.  Data collected was survival rate of larvae achieved until the end of larval rearing.  Research result showed that larvae produced by brood stock fed food supplemented with 10 g baker’s yeast per kg food had the highest survival rate namely 60%.  As conclusion, supplementation of baker’s yeast into brood stock feed might increase survival rate of larvae.   Keywords:  nile tilapia, baker’s yeast, larvae, survival rate

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