scholarly journals Response of larval and juvenile rudd Scardinius erythrophthalmus (L.) to different diets under controlled conditions 331

2009 ◽  
Vol 54 (No. 7) ◽  
pp. 331-337 ◽  
Author(s):  
J. Wolnicki ◽  
J. Sikorska ◽  
R. Kamiński
Keyword(s):  
Larval Growth ◽  
Survival Rates ◽  
Fish Growth ◽  
Spinal Deformities ◽  
Growth And Survival ◽  
First Feeding ◽  
Scardinius Erythrophthalmus ◽  
Controlled Conditions ◽  
Final Survival

The growth and survival of rudd <I>Scardinius erythrophthalmus</I> (L.) were evaluated in a laboratory at 25°C. In 20-day Experiment 1, first-feeding larvae at the age of 4 days post-hatch (initially: TL = 5.7 mm, BW = 0.9 mg) were fed live <I>Artemia</I> nauplii or commercial dry feed (Aller Futura Larvae, AFL) or combinations of both. Even the longest period of initial feeding of nauplii (6 days) was insufficient to obtain satisfactory larval growth after weaning to AFL (TL = 12.4 mm and BW = 17.7 mg vs. TL = 18.9 mm and BW = 68.5 mg for the nauplii-fed fish, significant differences). Nauplii-fed older larvae (24 days post-hatch) were then used in Experiment 2, in which they were fed AFL or Ewos AgloNorse (EAN) dry feeds for 40 days. The EAN diet proved to be significantly (<I>P</I> ≤ 0.05) superior to AFL regarding the final fish growth (TL = 36.5 mm and BW = 506.8 mg vs. TL = 33.4 mm and BW = 392.0 mg ), final survival rates (97.6% vs. 100%) and the incidence of spinal deformities (0% vs. 13.5%).

Effect of Prey Density and Prey Size on Growth and Survival of Juvenile Walleye (Stizostedion vitreum vitreum)

1989 ◽  
Vol 46 (8) ◽  
pp. 1323-1328 ◽  
Author(s):  
Michael G. Fox
Keyword(s):  
Prey Density ◽  
Prey Availability ◽  
Food Limitation ◽  
Survival Rates ◽  
Stizostedion Vitreum ◽  
Growth And Survival ◽  
First Feeding ◽  
Length Increase ◽  
Prey Length ◽  
Chironomid Biomass

I investigated the influence of food availability on growth and survival of walleye (Stizostedion vitreum vitreum) fry stocked in six fertilized experimental ponds (density 40 fish∙m−3) and reared for 8 wk. Walleye fed largely on chironomid larvae and cyclopoid copepods in weeks 1 and 2, and chironomids thereafter. Prey choice and consumption were strongly influenced by chironomid biomass in the benthos, and to a lesser extent by zoo-plankton density. Weekly length increase of the populations and mean length in week 7 were significantly correlated with chironomid benthic biomass and mean prey length. Chironomid biomass and density of large zoo-plankton together explained 56% of the variation in the weekly population growth rate. Despite obvious food limitation in the second half of the experiment, pond survival rate was not significantly correlated with mean prey density, mean stomach fullness, or percentage of fish with empty stomachs. The results indicate that juvenile walleye growth can be regulated by the density and size of available prey. Prey availability apparently does not regulate short term juvenile walleye survival rates after the period around first feeding.

Age-Specific Host Utilization in the Eastern Tent Caterpillar (Lepidoptera: Lasiocampidae)

2004 ◽  
Vol 39 (1) ◽  
pp. 94-100 ◽  
Author(s):  
L. K. Rieske
Keyword(s):  
Black Locust ◽  
Larval Growth ◽  
Survival Rates ◽  
Black Cherry ◽  
White Pine ◽  
White Oak ◽  
Growth And Survival ◽  
Conium Maculatum ◽  
Eastern Tent Caterpillar ◽  
Tent Caterpillar

Larval growth and survival of the eastern tent caterpillar, Malacosoma americana F., was assessed on its preferred host, black cherry (Prunus serotina Ehrhart), black locust (Robinia pseudoacacia L.), hackberry (Celtis occidentalis L.), white oak (Quercus alba L.), and white pine (Pinus strobus L.), and on the herbaceous biennial poison hemlock (Conium maculatum L.). Larvae grew largest and had the greatest pupation and survival rates when fed black cherry and white oak. They did not grow well on black locust or white pine, but survival rates were relatively high, suggesting that both plant species could potentially serve to sustain tent caterpillar populations. Growth and survival was so low on hackberry and poison hemlock that they pose little chance of sustaining outbreaking caterpillar populations.

The Nutrition of the Larva of Aedes Aegypti L

1945 ◽  
Vol 21 (3-4) ◽  
pp. 90-96
Author(s):  
L. GOLBERG ◽  
B. DE MEILLON ◽  
M. LAVOIPIERRE
Keyword(s):  
Folic Acid ◽  
Aedes Aegypti ◽  
Larval Growth ◽  
Survival Rates ◽  
Pantothenic Acid ◽  
Basal Medium ◽  
Brewer’S Yeast ◽  
Growth And Survival ◽  
Brewer's Yeast ◽  
Vital Effect

1. Autolysis products of fresh brewer's yeast, tested for their ability to promote growth of larvae of Aedes aegypti, revealed the loss of an essential part of the activity of the original yeast. Under suitably modified conditions this loss could be avoided. 2. A basal medium comprising the water-insoluble factor of brewer's yeast, glucose, salt mixture and yeast nucleic acid requires supplementation with thiamin, riboflavin, nicotinic acid, pantothenic acid and possibly with biotin in order to permit larval growth to the fourth instar. 3. For pupation, one further factor appears to be necessary, namely, folic acid. Its effect is specific, for it cannot be replaced by xanthopterin or thymine. It exercises an important effect also on growth and survival rates, bodily pigmentation and size of the larvae. 4. The following substances when added to or withheld from various media did not appear to influence growth or survival of the larvae; other vitamins of the B group, amino-acids, purines, pyrimidines, glutathione, ascorbic acid and possibly vitamin K. 5. Transference of larvae from a folic acid-free medium to one containing the vitamin, and vice versa, revealed that the presence of folic acid seems to have its most vital effect during the third stage of larval life.

BACTERIA AS FOOD FOR BLACKFLY LARVAE (DIPTERA: SIMULIIDAE) IN LABORATORY CULTURES AND IN NATURAL STREAMS

1964 ◽  
Vol 42 (4) ◽  
pp. 527-548 ◽  
Author(s):  
F. J. H. Fredeen
Keyword(s):  
Larval Growth ◽  
Survival Rates ◽  
Trophic Levels ◽  
Live Cells ◽  
Growth And Survival ◽  
Planktonic Bacteria ◽  
First Instar ◽  
Natural Streams ◽  
Fourth Species ◽  
Blackfly Larvae

Planktonic bacteria as food for filter-feeding blackfly larvae were investigated in laboratory tests and in the field. Three of the commonest blackflies in Western Canada, Simulium venustum, S. verecundum, and S. vittatum, developed to adults from first-instar larvae and a fourth species, S. arcticum, developed to, or nearly to, last-instar larvae, when offered only washed suspensions of Bacillus subtilis, Aerobacter aerogenes, or Escherichia coli as food.Average concentrations of 1.3 × 106 to 34.9 × 106 cells per ml of the gram-negative A. aerogenes allowed production of adults, with best larval growth and survival in the higher concentrations. In local streams and rivers the bacterial content ranged from 0.1 × 106 to 25.0 × 106 (av. 2.2 × 106) cells per ml. Ultraviolet irradiation of the bacteria to reduce the proportion of live cells to as low as 0.1%, near the proportion in many streams, and the use of the gram-positive B. subtilis, adversely affected survival rates of the larvae.In certain streams bacteria and blackfly larvae apparently represented the basic trophic levels in the food web. Also, bacteria leached from soils and sewage may have been important in the development of outbreaks of S. arcticum.

Daily Mortality Rates of Larval and Juvenile American Shad (Alosa sapidissima) in the Connecticut River with Changes in Year-Class Strength

1983 ◽  
Vol 40 (10) ◽  
pp. 1719-1728 ◽  
Author(s):  
V. Crecco ◽  
T. Savoy ◽  
L. Gunn
Keyword(s):  
Survival Rates ◽  
Mortality Rates ◽  
American Shad ◽  
Connecticut River ◽  
Alosa Sapidissima ◽  
Growth And Survival ◽  
Juvenile Mortality ◽  
First Feeding ◽  
Gompertz Equation ◽  
Class Strength

Age-specific growth and survival rates were estimated for larval and juvenile American shad (Alosa sapidissima) from the Connecticut River from 1979 to 1982. Relative indices (CPE) of year-class strength of juveniles determined from seine sampling in 1978–82 and 1966–73 are compared with resulting levels of adult recruitment. Length–age data for larval and juvenile American shad were determined from sagittal otoliths. Length increments among larval and juvenile shad followed an asymptotic pattern with age, both life stages being well described by the Gompertz equation. Larval survivorship curves from 1979 to 1982 were age specific, with mortality rates of 19.8–25.6%/d for first feeding larvae and 4.3–8.7%/d for larvae approaching metamorphosis. By contrast, juvenile mortality rates were much lower (1.8–2.0%/d) and more consistent among years. Juvenile indices of year-class strength from 1966 to 1973 were positively correlated (r = +0.92, df 7, P < 0.001) with recruitment levels of adult females 4–6 yr later, suggesting that year-class strength of shad is established prior to the juvenile stage.

scholarly journals EFFECT OF ADDITIONAL GINGER (Zingiber officinale var. amarum) ON FEED ON THE GROWTH AND SURVIVAL LEVEL OF GOLDFISH (Cyprinus Carpio)

2021 ◽  
Vol 1 (2) ◽  
pp. 54-67
Author(s):  
Nining Syafirah ◽  
Muhammad Marzuki ◽  
Baiq Hilda Astriana
Keyword(s):  
Survival Rate ◽  
Cyprinus Carpio ◽  
Economic Value ◽  
Survival Rates ◽  
Zingiber Officinale ◽  
Fish Growth ◽  
Control Treatment ◽  
Good Survival ◽  
Feed Conversion ◽  
Growth And Survival

Goldfish is one of the most popular freshwater cultivated fish because it is one of the freshwater commodities that has economic value and is sold at a price that is affordable to all groups. Ginger is a natural ingredient that can stimulate fish growth. The purpose of this study was to determine the effect of adding ginger to feed and to determine a good dose of ginger for growth and survival rates of carp (Cyprinus carpio). This research was conducted by experimental method using completely randomized design (CRD) with 5 treatments and 3 replications. The treatments given were Treatment 1: 0 grams, without adding ginger / kg of feed (control), Treatment 2: 2.5 grams of ginger / kg of feed, Treatment 3: 5 grams of ginger rhizome / kg of feed, Treatment 4: 7.5 grams of ginger / kg of feed, Treatment 5: 10 grams of ginger / kg of feed. The results showed that the addition of ginger had no significant effect on absolute length growth, absolute weight growth, feed conversion ratio, and feed efficiency, but had a significant effect on the survival rate of goldfish (cyprinus corpio). And a good dose of ginger is in P2 treatment with a dose of 2.5 grams of ginger, because it has been able to show a good survival rate of 100%.

scholarly journals Use of three forms of decapsulated Artemia cysts as food for juvenile noble crayfish (Astacus astacus)

2011 ◽  
Vol 56 (No. 3) ◽  
pp. 114-118 ◽  
Author(s):  
A. Kouba ◽  
J. Hamáčková ◽  
M. Buřič ◽  
T. Policar ◽  
P. Kozák
Keyword(s):  
Survival Rates ◽  
Astacus Astacus ◽  
Poor Growth ◽  
Controlled Conditions ◽  
Noble Crayfish ◽  
Final Survival ◽  
Artemia Cysts

Summerling (six-month old) noble crayfish fed two forms of freshly decapsulated (FD) Artemia cysts more than tripled their weight during a 75-day experiment under controlled conditions. Final survival rates were at the level of 90%. Feeding commercially available industrially decapsulated cysts resulted in both poor growth and reduced survival (22.2%). Therefore FD Artemia cysts may be an effective diet for crayfish culture, but dehydrated industrially decapsulated (DID) cysts should be used with caution to avoid products of low quality. That should be considered especially in slow feeders such as crayfish because of leaching of nutrients from DID cysts. Costs of the processing of freshly decapsulated cysts are discussed.

scholarly journals Individual rearing of common octopus (Octopus vulgaris Cuvier, 1797) in tanks: Preliminary results

2019 ◽  
Vol 36 (4) ◽  
pp. 361-366
Author(s):  
Halil Şen
Keyword(s):  
Free Group ◽  
Specific Growth ◽  
Survival Rates ◽  
Maximum Density ◽  
Octopus Vulgaris ◽  
Growth And Survival ◽  
The Individual ◽  
Acclimatization Period ◽  
Final Survival ◽  
Specific Growth Rates

The effects of individual rearing technique on the growth and survival of Octopus vulgaris (Cuvier, 1797) were investigated. Therefore, wild octopuses were reared in the transparent, perforated and caped polyethylene terephthalate (PET) pots (10 l). The assay was established as one free group rearing as a control (12.7 kg/m3 of stoking density) and two individual rearing groups as I1 and I2 (13.8 kg/m3 and 18.3 kg/m3 of stoking density, respectively). The individuals were fed mainly fresh or thawed fish at 5% body weight per day. The experiments lasted for 120 days. The acclimatization period of the octopuses lasted within 3-5 days in the individual rearing and 7-10 days in the free group rearing. The final survival rates were 100% for the control and I1 or 85.7% for I2 (P>0.05). Statistically, differences were not found among the growth or specific growth rates (between 0.5 and 0.6%/day for the trials) (P>0.05). The maximum density (30.7 kg/m3) was obtained from the I2 trial.

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