scholarly journals Effect of water temperature and prey concentrations on initial development of Lophiosilurus alexandri Steindachner, 1876 (Siluriformes: Pseudopimelodidae), a freshwater fish

2014 ◽  
Vol 12 (4) ◽  
pp. 853-859 ◽  
Author(s):  
Rodrigo Takata ◽  
Walisson de Souza e Silva ◽  
Deliane Cristina Costa ◽  
Reinaldo Melillo Filho ◽  
Ronald Kennedy Luz
Keyword(s):  
Growth Rate ◽  
Water Temperature ◽  
Specific Growth ◽  
Condition Factor ◽  
Fish Larvae ◽  
Neotropical Fish ◽  
Prey Concentration ◽  
Initial Development ◽  
Nitrogen Incorporation ◽  
Artemia Nauplii

The aim of this study was to investigate the effects of water temperature and prey concentrations (Artemia nauplii) on the initial development of Lophiosilurus alexandri larvae. The experiment was conducted using a 4 x 2 factorial design, with four water temperatures (23, 26, 29 and 32 °C), two different initial prey concentrations (P700 and P1,300) and three replicates. Feeding was increased during the fifteen-day experiment. At the end of the experiment, the survival and condition factor were affected only by prey concentrations, with elevated numbers of Artemia nauplii leading to higher averages of these variables. The total length (TL) and specific growth rate were separately influenced by temperature and prey concentration, without interaction between them, and weight showed an interaction with these factors. In general, an increase of temperature (23 to 32 °C) improved the growth and nitrogen gain in L alexandri larvae. For TL, the optimal temperatures estimated were 31.4 and 31.0 °C for P700 and P1,300, respectively. Similar mean body weight larvae and nitrogen gain were observed at 23 °C for both levels of prey concentrations. For other temperatures, the P1,300 level provided greater weight gain for L. alexandri. Therefore, it is suggested that temperatures between 29-32 °C combined with a higher level of prey concentration maximise the development and nitrogen gain in L. alexandri larvae. Moreover, this is the first result about nitrogen incorporation in neotropical fish larvae.

scholarly journals Effect of prey concentrations and feed training on production of Hoplias lacerdae juvenile

2015 ◽  
Vol 87 (2) ◽  
pp. 1125-1132 ◽  
Author(s):  
RONALD K. LUZ ◽  
MARIA CÉLIA PORTELLA
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Second Phase ◽  
Prey Concentration ◽  
Total Length ◽  
Formulated Diet ◽  
Artemia Nauplii ◽  
Active Feeding

The aim of this work was to investigate the effects of daily prey concentration during the first 15 days of active feeding of Hoplias lacerdae larvae, and the juvenile size on the feed training. In the first phase, the larvae received five Artemia nauplii concentrations (P). In the second phase, the juveniles from each treatment were trained to accept formulated diet. Superior growth was related to higher initial daily prey concentrations (900 and 1100 nauplii larvae-1). During feed training, the growth tendency was similar to that verified in the first phase. The lowest values of specific growth rate (SGR) were registered after the introduction of the semi-moist diet used in the feed training. However, the values of SGR recovered along the experiment and similar rates were found among the treatments. Survival, mortality and cannibalism were similar in the different treatments at the end of both phases. It can be concluded that: the prey concentration affects growth of H. lacerdae during the first 15 days of active feeding, and feed training can be initialized with juveniles of about 16 mm of total length.

scholarly journals Azolla a Boon for the Growth of Gift Tilapia, Oreochromis Niloticus (Linnaeus, 1758)

2021 ◽  
Author(s):  
LEENA GRACE BESLIN ◽  
MONISHA RAJAN
Keyword(s):  
Growth Rate ◽  
Growth Analysis ◽  
Specific Growth ◽  
Condition Factor ◽  
Control Diet ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Feed Conversion ◽  
Relative Growth ◽  
Gift Tilapia

Abstract Appreciative dietary desires and fabrication of fish nourishment is vital to the progress, sustainability of aquaculture and for the advanced feed mill rehearsal. Organizing fish feed includes choosing the exact feed, using an acceptable feeding technique, work out the feed charge and ensuring the cost efficiency of fish farm. The purpose of our present study was to feed the fishes with four different feeds and assessment of growth performance by length weight relationships. The growth analysis was executed by measuring FCR and related indices in gift tilapia oreochromis niloticus. Four feed composition was selected without any chemical contamination. In the present study fishes were collected from the golden farm, Neyyattinkara, Thiruvananthapuram district, South India. Fishes were introduced into four different tanks of well oxygenated good quality water. In each experimental tank, 20 fishes were introduced. For each experimental container a specific feed was fixed from 4 different diets. Every day feed was given to the fishes. They were fed two times for the period of 3 months. They were maintained to assess their growth performance. Four types of feeds used for the present study were control diet, diet 1, diet 2 and diet 3. Length and weight were measured on every 15 days interval for growth estimation. Based on the length-weight data, growth analysis was carried out by calculating relative growth (RG), relative growth rate (RGR), specific growth rate (SGR), feed conversion ratio (FCR) and the Fulton’s condition factor. The results of mean length in diet3proved the highest length of 6.455±0.46cm and diet one contain lowest length of 5.03±0.68cm. Highest weight of 96.8 ± 0.37g was recorded in diet3 and lowest weight obtained for the control diet (3.645 ± 0.306 g). In growth analysis the relative growth of fish was estimated in diet 3 having high relative growth (11.91). Relative growth rate was elevated in diet 3(1.5597). The upper limit of specific growth rate was 1.9146% noticed in diet 3. The feed conversion ratio was maximum in diet 3 (58.06) and minimum in control diet (36). The highest k value in Fulton's condition factor was noticed in diet 3(88.32).All experimental results proved that live Azolla [D3] was a superior feed for the present trials.

scholarly journals PERGANTIAN PAKAN TERHADAP PERTUMBUHAN DAN KELANGSUNGAN HIDUP LARVA IKAN GURAMI (Osphronemus gouramy) TURN FEED ON THE GROWTH AND SURVIVAL OF FISH LARVAE CARP (Osphronemus gouramy)

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Eka Indah Raharjo ◽  
Hastiadi Hasan ◽  
Darmawan .
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Fish Larvae ◽  
Average Length ◽  
Natural Food ◽  
Growth And Survival ◽  
Quality Of Water ◽  
Randomized Design ◽  
Absolute Growth

ABSTRAK Penelitian bertujuan untuk mengetahui pergantian pakan. penelitian menggunakan Rancangan Acak Lengkap yang terdiri dari 5 perlakuan dan 3 ulangan. Susunan perlakuan adalah sebagai berikut : Perlakuan A : eguchi 10 hari dan infusoria 10 hari, Perlakuan B : infusoria 10 hari dan eguchi 10 hari, Perlakuan C : Eguchi 20 hari, Perlakuan D : Infusoria 20 hari dan Perlakuan E : campuran eguchi 50% dan Infusoria 50% selama 20 hari. Penelitian ini dilakukan selama 20 hari untuk mengetahui laju pertumbuhan spesifik bobot, laju pertumbuhan mutlak panjang, kelangsungan hidup dan kualitas air sebagai data penunjang. Hasil penelitian menunjukkan pergantian pakan alami dengan pakan buatan menghasilkan respon yang baik dalam pertumbuhan larva ikan gurami. Pergantian pakan buatan (eguchi) dengan pakan alami (infusoria)(perlakuan A) memberikan hasil terbaik dengan rata – rata laju pertumbuhan spesifik bobot 5,3256%, rata – rata laju pertumbuhan mutlak panjang 5.70 mm dan rata – rata kelangsungan hidup 78.89%.  Kata Kunci : Infusoria, Eguchi, Larva Ikan Gurami, Laju Pertumbuhan ABSTRACT Research was aimed to determine the change of feed. research using completely randomized design consisting of 5 treatments and 3 replications. The composition of the treatment is as follows: Treatment A: Eguchi 10 days and infusoria 10 days, Treatment B: infusoria 10 days and Eguchi 10 days, Treatment C: Eguchi 20 days, Treatment D: Infusoria 20 days and Treatment E: a mixture of Eguchi 50% and infusoria 50% for 20 days. This research was conducted for 20 days to determine the specific growth rate weight, the absolute growth rate of long survival and quality of water as supporting data. The results showed turnover natural feed with artificial feed to produce a good response in the growth of larval carp. Substitution of artificial feed (Eguchi) with natural food (infusoria) (treatment A) gives the best results with the average - average specific growth rate 5.3256% weighted, averageabsolute growth rate, average length of 5.70 mm and survival rate 78.89% . Keywords : Infusoria, Eguchi, Fish larvae Gurame, Growth Rate

scholarly journals The Effect of Different Thyroxine Hormone (T4) Concentration on The Growth, Survival, and Pigment Development of Pink Zebra Fish Larvae (Brachydanio reiro)

Omni-Akuatika ◽  
2018 ◽  
Vol 14 (2) ◽  
Author(s):  
Arifianto Heraedi ◽  
Slamet Budi Prayitno ◽  
Tristiana Yuniarti
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Fish Larvae ◽  
Average Length ◽  
Average Weight ◽  
Zebra Fish ◽  
Total Length ◽  
Absolute Growth

The thyroxin hormone plays an important role in the process of metabolism, yolk sac absorbsion, and growth of fish. The aims of this research were to observe the effect of various concentration of thyroxin (T4) on the absolute growth weight, total length, survival rate, and pigment development of pink zebra fish larvae (Brachydanio reiro ) after being reared 42 days. The pink zebra fish larvae at 4 day age with the average weight of  0,002 – 0,003g and average length of ± 3.10 – 3.43 mm were immersed at various concentration of T4 for 24 hours. Prior the treatment fish larvae were dipped into 1 ppt salinity for 2 minutes then transferred into 1 Liter, 1ppt saline and various T4 in plastic bags. The thyroxin concentrations were A (0 mg / L); B (0.05 mg / L); C (0.10 mg / L) and D (0.15 mg / L) respectively. The stocking density was 40 fish/L. After that they were transferred into aquariums and reared for 42 days. Completely Randomized Design (RAL) with four treatments and three replications were used. The variables observed were absolute and specific growth, total length, survival rate and hue degree. The results showed that the thyroxin hormone had significant effect on absolute growth weight, total length and specific growth rate.  The dosage 0.1 mg/L was the best treatment on absolute growth, total length, and specific growth rate. Whilee the survival rate showed no significant differences across the treatments. Treatment C also demonstrated the best ppigment development (14.60 + 0.36º hue) compared to others.

scholarly journals Quality of Nephrops as food for Atlantic cod (Gadus morhua L.) with possible implications for fisheries management

2004 ◽  
Vol 61 (6) ◽  
pp. 983-991 ◽  
Author(s):  
Björn Björnsson ◽  
Maria Álvaro Dongala Dombaxe
Keyword(s):  
Growth Rate ◽  
Gadus Morhua ◽  
Specific Growth ◽  
Condition Factor ◽  
Atlantic Cod ◽  
Gonadosomatic Index ◽  
Conversion Ratio ◽  
Food Conversion ◽  
The Mean

Abstract Nephrops was found to be of low quality as food for cod. In a laboratory experiment the mean specific growth rate of 1 kg cod was 0.184 and 0.415% d−1 when fed to satiation on Nephrops and capelin, respectively. This large difference in growth rate resulted not only from less intake of Nephrops (1.19 kg cod−1) than capelin (1.55 kg cod−1) but also because more Nephrops (4.6 kg) than capelin (2.2 kg) were required to produce each kilogramme of cod. Higher food conversion ratio was consistent with lower fat content of Nephrops (1.3%) than capelin (9.2%) but the exoskeleton also reduced the digestion rate of Nephrops. In the groups where Nephrops and capelin of equal mean weight were offered simultaneously, 40% of the diet consisted of Nephrops during the first week and 10% during the final seven weeks of the experiment. At the end of the experiment, condition factor, liver index, and gonadosomatic index were significantly lower for cod fed on Nephrops (0.967, 5.7, 7.1, respectively) than for those fed on capelin (1.086, 15.8, 11.2, respectively). These results suggests that predation by cod on Nephrops might be reduced by regular release of capelin or other similar food in the distributional areas of Nephrops.

The Growth of Brown Trout (Salmo Trutta Linn.)

1946 ◽  
Vol 22 (3-4) ◽  
pp. 130-144
Author(s):  
MARGARET E. BROWN
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Rapid Growth ◽  
Salmo Trutta ◽  
Specific Growth ◽  
Condition Factor ◽  
Specific Rate ◽  
Annual Growth Rate ◽  
Size Hierarchy ◽  
Rate Of Growth

1. Two-year-old trout were grown in environments where the following factors were controlled: temperature, amount and intensity of illumination, rate of flow, composition and aeration of the water, quality and quantity of food and amount of living space. 2. The specific growth rate of an individual depended on its size relative to that of the others in the group. It is suggested that subgroups of four or five individuals existed within the size hierarchy and were reorganized at intervals of about 3 months. 3. There was an optimum degree of crowding for rapid growth, and overcrowding led to lower appetite and efficiency of utilization of food, while under-crowded trout ate and grew erratically. 4. In spite of constant environmental conditions, all the fish had an annual growth-rate cycle, with an autumn check, a spring maximum, rapid summer growth and another autumn check, which coincided with maturation of the gonads when they became 3 years old. 5. Individual specific growth rates fluctuated over periods of 4-6 weeks, and rapid growth in length alternated with rapid growth in weight. The specific rate of growth in length was directly proportional to the condition factor. The amount of food eaten, the efficiency of utilization of food and the specific rate of growth in weight varied with the condition factor and were maximal for a factor of about 1·10. 6. The growth-rate fluctuations were exaggerated and the efficiency was greater when the food supply was restricted. At the maintenance level the change in weight was directly proportional to the amount of food eaten. The maintenance requirement decreased, relatively, with increase in body weight. 7. The mean specific growth rate was higher with less than 12 hr. per diem of the standard illumination.

scholarly journals Exposure to Atrazine Impairs Behaviour and Growth Performance in African Catfish, Clarias gariepinus (Burchell, 1822) Juveniles

2021 ◽  
Vol 5 (1) ◽  
pp. 165-172
Author(s):  
P.A. Opute ◽  
I.P. Oboh
Keyword(s):  
Growth Rate ◽  
Growth Performance ◽  
Specific Growth ◽  
Condition Factor ◽  
Clarias Gariepinus ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Allometric Growth ◽  
Feed Conversion ◽  
Relative Growth

Clarias gariepinus juveniles of average weight, 17.57±1.95 g and an average length of 14.26±0.39 cm were exposed to environmentally relevant concentrations of 0 (control), 2.5, 25, 250, and 500 µg L-1 atrazine in a quality-controlled 28-day bioassay. Growth performance was assessed bi-weekly and fish samples were taken from different tanks to determine the relative growth rate, specific growth rate, feed conversion ratio, condition factor and behaviour. At the end of two weeks of exposure, the relative growth rate and the specific growth rate among exposed fish groups was found to reduce significantly (p<0.05) compared to the control, an indication of poor growth performance. The average specific growth rates (SGR) of control fish is 3.86±0.02 %/w at the end of the exposure duration while recording -0.64±0.09 in the 500 µg L-1 group. Feed conversion ratio increased significantly from control to the group with highest atrazine concentration. Condition factor (K) of fish among treatment groups showed significant decrease in values with increasing concentration of atrazine in a dose-dependent pattern. Atrazine exposure resulted in behavioural anomalies including erratic swimming, clinging to the water surface, loss of equilibrium, lethargy, and discolouration. The behavioural responses were found to be concentration-dependent. The length-weight relationships for both control and atrazine exposed fish exhibited positive allometric growth and significant relationships as depicted by the value of R2 (coefficient of determination) except in the fish group exposed to 500 µg L-1 atrazine which exhibited negative allometric growth. Findings from this study indicate interference with normal behaviour and growth performance of C. gariepinus juveniles with ecological implications in water bodies exposed to atrazine even at reduced concentrations.

scholarly journals Application of Live Feeds in the Freshwater Ornamental Fish Larvae of Puntius Dorsalis (Jerdon)

2005 ◽  
Vol 4 (2) ◽  
pp. 1-7
Author(s):  
B. Victor ◽  
M. Mannar Mannan ◽  
M. Maridass ◽  
P. Murphy Alexander ◽  
J. M. A. P. Arachi
Keyword(s):  
Growth Rate ◽  
Specific Growth ◽  
Fish Larvae ◽  
Maximum Growth ◽  
Maximum Growth Rate ◽  
Ornamental Fish ◽  
Mosquito Larvae ◽  
Larval Fishes ◽  
Live Feed ◽  
Live Feeds

Feeding experiment conducted under laboratory conditions, to determine the suitability of live feed for the larvae of ornamental fish Puntius dorsalis, shows the increase of specific growth rate and weight gain when they were fed with mosquito larvae( 3.284 and 8.04%/day),chironomus larvae(3.308 and 6.24%/day),chopped earthworm (2.618 and 4.39%/day). The maximum growth rate,0.614g was observed in mosquito larvae feed followed by chironomus larvae(0.522 g),chopped earthworm(0.411g) and plankton(0.405g). The present study indicates that mosquito larvae could be used as a suitable live feed for feeding Puntius dorsalis larval fishes.

scholarly journals HIBRIDISASI INTERSPESIFIK TIGA SPESIES IKAN TOR (Tor soro, Tor douronensis, DAN Tor tambroides) SECARA RESIPROKAL PADA FASE LARVA

2021 ◽  
Vol 16 (1) ◽  
pp. 1
Author(s):  
Toni Yulian Kusmardani ◽  
Otong Zenal Arifin ◽  
Agoes Soeprijanto ◽  
Yunita Maimunah
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Fish Larvae ◽  
Fertilization Rate ◽  
Hatching Rate ◽  
Market Demand ◽  
Farmed Fish ◽  
Pure Breed

Ikan Tor merupakan genus yang potensi dibudidayakan karena memiliki nilai ekonomis tinggi. Masalah yang ada adalah lambatnya pertumbuhan dan rendahnya tingkat sintasan benih ikan tersebut dalam jumlah yang memadai untuk pembudidaya. Hibridisasi atau persilangan merupakan suatu upaya untuk mendapatkan kombinasi antara populasi yang berbeda untuk menghasilkan keturunan yang memiliki sifat unggul. Hibridisasi tiga spesies ikan Tor secara resiprokal antara Tor soro (Ts), Tor douronensis (Td), dan Tor tambroides (Tt) dilakukan guna untuk mengetahui keberhasilan hibridisasi beda spesies tetapi masih dalam genus. Metode yang digunakan pada penelitian ini adalah eksperimen dengan enam perlakuan dan tiga kali ulangan hasil hibrida. Hasil yang diperoleh menunjukkan nilai derajat pembuahan tertinggi dihasilkan dari hibridisasi Td >< Ts (93,66 ± 1,15%), daya tetas tertinggi dihasilkan dari persilangan Td >< Ts (88,00 ± 1,00%), laju pertumbuhan spesifik bobot tertinggi dihasilkan dari hibridisasi Ts >< Td dan Ts >< Tt (5,62 ± 0,17%; 5,44 ± 0,06%), laju pertumbuhan spesifik panjang tertinggi dihasilkan dari hibridisasi Ts >< Td (1,79 ± 0,11%) dan sintasan tertinggi dihasilkan dari hibridisasi Tt >< Ts (86,00 ± 3,60%). Nilai heterosisyang meliputi derajat pembuahan, daya tetas telur, pertumbuhan benih, dan sintasan ikan sampai umur 41 hari menunjukkan nilai negatif, kecuali laju pertumbuhan spesifik bobot. Hibridisasi berdampak pada meningkatnya jumlah larva abnormal yang dihasilkan dibanding tetuanya (pure breed).Tor fish has the potential to be commercially developed as a farmed fish due to its high economic value and market demand. However, slow growth and low survival rate of the fish larvae and insufficient seed availability for aquaculture farmers are the main bottlenecks to develop a profitable aquaculture for tor fish. Hybridization or crossbreed is an attempt to get a combination between different populations to produce offspring inheriting superior characters. A reciprocal hybridization between Tor soro (Ts), Tor douronensis (Td), and Tor tambroides (Tt) was carried out to assess the success rate of hybridization between the three species. The study used an experimental design with six treatments and three replications to measure and compare hybridization and survival parameters between the species. The highest fertilization rate attained by hybridization Td >< Ts (93.66 ± 1.15%, the highest hatching rate was achieved by Td >< Ts (88.00 ± 1.00%), the highest weight specific growth rate was gained by hybridization Ts >< Td and Ts >< Tt (5.62 ± 0.17%; 5.44 ± 0.06%), the highest lenght specific growth rate was achieved by hybridization Ts >< Td (1.79 ± 0.11%) and highest survival rate was resulted from hybridization between Tor tambroides >< Tor tambroides (90.33 ± 1.52%). The observed heterosis (degree of fertilization rate, hatching rate, growth rate, and survival rate until the age of 41 days) showed that all parameter characters were negative, except for the weight-specific growth rate characters. This study concludes that hybridization have an impact on increasing the number of abnormal larvae produced compared to their parents (pure-breed).

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