• Proceedings of the Korean Society of Applied Entomolohy Conference
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• 2003.10a
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• pp.75-75
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• 2003

• Journal of Aquaculture
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• v.9 no.2
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• pp.109-115
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• 1996

Tagging method, recapture frequencies and mortalities were investigated to obtain the basic data for the effective release technique of abalone, Haliotis discus hannai. Tagged and untagged H. discus hannai were reared for 90 days in the laboratory. Attachment of plastic piece by Alteco was used as tag material. The growth, mortality and falling rate of tags were examined. Data from stock in natural condition showed that fishing rate, fishing mortality and natural mortality of tagged group were 0.04, 0.0195 and 0.4652, respectively.

• Korean journal of applied entomology
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• v.40 no.2
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• pp.131-136
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• 2001

Cabbage butterfly, Pieris rapae was reared in a room to establish a year-round rearing system. The eggs oviposited by the parent fed on host plant showed 89.2% of hatchability and hatched in 3.9 days after oviposition. The larval period was 18.1 days under high temperature, long day condition ($25^{\circ}C$, 16L : 8D), showing 97.8% pupal ratio and emergence rate. However, under low temperature, short day condition ($21^{\circ}C$, 10L : 14D) the larval period extended to 23.6 days and the pupal ratio was 70%. All of those pupae went into diapause. The oviposition preference experiment on different hosts (Chinese cabbage, cabbage, tulip and kale) showed that hot-water extract was preferred over methanol extracts or squeezed raw juices. The host preference showed that Chinese cabbage was less preferred than the other three. The artificial ovipositing kit was constructed for the oviposition in a room. The 48-hours old eggs could be stored for 7 days at$ 5^{\circ}C$ and showed 70% of hatchability. Non-diapausing pupae could be stored for 30 days at 5 to $15^{\circ}C$, showing 85% of emergence rate. However, the pupae stored at $5^{\circ}C$ showed longer storage period and higher emergence rate. The systematic successive rearing method of cabbage butterfly in a room was completed, based on the above experiments.

• Journal of Animal Environmental Science
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• v.15 no.1
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• pp.1-8
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• 2009

This study was conducted to analyze the effects of sow breeding environment on the reproduction in the first litter in a large-sized hog farm, located in Dangjin-gun, Chungnam from July 1st, 2007 to June 30th, 2008 and provide basic information to improve the sow productivity in a family farming sows. The results obtained were as follows; 1. The gestation periods were proved to be similar without significant differences between indoor and outdoor breeding grounds, The average of farrowing rate was 91.91%, and 92.54% farrowing rate of out-door ground breeding sows was slightly greater than 91.57% of group-housed sows, but there was no significance between two groups. 2. The average of total litter size and the number of born alive per litter were 9.81 and 9.02, respectively. The number of total number was 0.98 and the number of born alive per litter was 1.18 in the outdoor-ground breeding sows, which was significantly greater than group-housed sows(p<0.001). 3. The number(rate) of piglets stillborn was 0.22(2.10%) from the outdoor-ground breeding sows was significantly greater, compared with 0.33(3.53%) from group-housed sows(p<0.01). The number of piglets culled was 0.23(2.27%) and 0.26(2.77%), in the out-door ground breeding sows and in group-housed sows, respectively and it was not significantly similar between two groups. And, the number of mummies was 0.21(2.1%) and 0.28(2.29%), in the out-door ground breeding sows and in group-housed sows, respectively, which showed no significance. 4. The weaning number in the playground breeding sows was 9.48 and it was significantly greater than that in the group-housed sows(p<0.001). The average of weaned age was observed to be 22.91 days. The weaned age in the out-door ground breeding sows was 22.39 days, and it was significantly smaller than that in group-housed sows(p<0.001). The breeding rate for the weaning of pigs was satisfactory as 96.82%, but there was no significant difference between two groups.

• Proceedings of the Korean Society of Applied Entomolohy Conference
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• 2004.05a
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• pp.97-97
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• 2004

• Proceedings of the Korean Society of Applied Entomolohy Conference
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• 2000.05a
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• pp.66-66
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• 2000

• Journal of Sericultural and Entomological Science
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• v.53 no.1
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• pp.1-5
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• 2015

As increasing utilization of Tenebrio molitor for industry, establishing effective conditions of indoor mass-rearing system become more important. For this reason, the aim of this study was to identify the physiological characteristics of Tenebrio molitor in different range of temperatures, photoperiods and rearing densities for mass breeding. As a result, their egg had above 70% hatching rate at $17.5{\sim}27.5^{\circ}C$ and the egg period was shown 5~7 days in $25{\sim}35^{\circ}C$. Consequently, in the consideration of the hatching rates and egg periods, the optimal indoor temperature for rearing was $25{\sim}27.5^{\circ}C$. Furthermore, development period of larvae in mass breeding system was shorter than individual breeding system under all the conditions of temperature. Also, the pupal weight was higher in mass breeding system except for $20^{\circ}C$ and $25^{\circ}C$. Considering elasticity of demand and weight of production, the effective condition was mass-breeding system at $25^{\circ}C$. In photoperiodic condition, the shortest of larval period was 157.35 day in 14L : 10D.

• The Korean Journal of Pesticide Science
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• v.10 no.3
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• pp.196-200
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• 2006

In this study we investigated fecundity and survivorship of four staple Korean freshwater cladocerans for their whole life to develop a new standard method used for ecological risk assessment of pesticide. The tested Korean freshwater cladocerans were Daphnia obtusa, Daphnia sp., Moina macrocopa and Simocephalus vetulus. In addition, standard test species, Daphnia magna endorsed formally by the major international organizations was tested together in order to compare with the reproductive characteristics of Korean cladocerans. A total of 358 young was produced by D. magna, whereas, 297 young was reduced by Daphnia sp. throughout the entire life. The average life span of Daphnia magna was 50 days much longer than any other Korean species. Nevertheless all of the Korean water flea tested showed good fecundity, produced over 60 young for 21 days as the validation criterion for reproduction toxicity test in Ecological Effects Test Guidelines published by USEPA. Especially Moina macrocopa produced their first brood in 4 days. Therefore 10 day reproduction test with Moina macrocopa may be an alternative good method to save cost and time to elucidating the effects of hazardous substances on the reproduction of aquatic invertebrates.

• Korean journal of applied entomology
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• v.12 no.1
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• pp.41-46
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• 1973

1) The optimum temperature for mass rearing of stable fly was $26^{\circ}C$ centigrade. Number of days required for stage of development at $26^{\circ}C$ were 6.8 days for larval stage, 5.3 days for pupla stage, 10.4 days for preovipositionla stage, and 30 days for adult stage respectively. 3) The pupation rate, emergence rate and sex ratio were $80.7\%,\;84.3\%$ and 1 : 1, respectively. 3) The average weight of pupae was 14.5mg, and the standard medium showed better result in larvae rearing than wheat bran medium. 4) The optimum number of eggs for inoculation on 125gr medium was approximately 310. 5) Optimum size of resting place was determined as $2inch^2/adult$ when it reared in a rectangular cage.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.9 no.1
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• pp.61-68
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• 1976

For the artificial precocious breeding of abalone effects of changes in environmental parameters, water temperature and light period, on the induction of spawning have been studied. Subtidal specimens of Haliotis discus hannai were collected irregularly for 6 times from April to June 1975 in Chungmu Bay near Jukdo Island, the southern coast of Korea. One hundred and fifty specimens were reared in 4 aquarium tanks in the laboratory and in a creel submerged in the sea during the period of 60 days from April 24 to June 23, 1975. The all groups kept in the four tanks and a creel showed very high spawning rates $(70\~100\%)$, compared to those inhabited the natural environment at sea until right before the spawning time $(0\~50\%,\;average\;16.4\%)$. From the results of the present induced spawning, the parameters can be discussed as follows: It seems likely that photoenvironment may stimulate to produce and secrete some internal substances which may concern to giving the fertilizing ability to the eggs before spawning and to inducing spawning, but the temperature may not be a factor for this concern. For effective precocious breeding, it seems to require that abalones are to be realoed under controlled conditions of darkness below 2,000 lux even during day time for more than 60 days before inducing spawning.