• 한국수산과학회지
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• 제26권6호
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• pp.511-518
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• 1993

해산어류의 종묘생산시 초기 동물먹이생물로 널리 이용되는 미소형, 소형, 대형 윤충(Brachionus plicatilis)의 환경요인에 따른 수명과 번식력을 조사하였다. 전반적으로 온도는 $25{\sim}27^{\circ}C$가 $20{\sim}22^{\circ}C$ 보다 번식력과 수명이 높았으며 미소형과 소형윤충은 이러한 현상이 더욱 뚜렷하였다. 염분은 미소형과 대형 윤충은 32ppt보다 16ppt에서 번식력이 더욱 높았던 반면 소형 윤충은 32ppt에서 더욱 높았다. 먹이생물은 미소형과 대형 윤충은 Tetraselmis tetrathele 소형 윤충은 Chlorella ellipsoidea가 더 좋은 먹이 효율을 보였다. 각 윤충의 먹이생물, 수온, 염분에 따른 최고의 번식력은 미소형 윤충은 Tetraselmis tetrathele, $25{\sim}27^{\circ}C$, 16ppt, 소형 윤충은 Chlorella ellipsoidea, $25{\sim}27^{\circ}C$, 32ppt ,대형 윤충은 Chlorella ellipsoidea, $25{\sim}27^{\circ}C$, 16ppt에서 나타났다.

• 생명과학회지
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• 제11권2호
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• pp.121-125
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• 2001

Some attempts were made to investigate the biological characterisitcs of the green rice leafhopper(GLH) , Nepthotettix cincticeps Uhler in terms of nymphal development, emergence ratio. preovipositional period, growth index, adult longevity and fecundity fed on rice cultivar, Chucheongbyeo with no resistance gene and water foxtail, Alpecurus aequalis Sobol. var. amurensis Ohwi at 20 and $25^{\circ}C$ with a 16L;8D photoperiod. Development period of nymph on rice cultivar and water foxtail at $25^{\circ}C$ was shorter than that at 2$0^{\circ}C$ by twofold. The nymphal period of female was about one day longer than that of male. The mean emergence ratio of female and male on rice cultivar and water foxtail was 40.0, 76.7, 38.3, 73.3% at 20 and $25^{\circ}C$, respectively. Preovipositional period on rice cultivar and water foxtail at $25^{\circ}C$ was shorter that at 2$0^{\circ}C$ by twofold. Growth index on rice cultivar adn water foxtail at $25^{\circ}C$was higher than that at 2$0^{\circ}C$ by fourfold. Under the 20 and $25^{\circ}C$ condition, the longevity of female and male was longer on water foxtail than on rice cultivar, but the fecundity of GLH was higher on rice cultivar than on water foxtail. In conculsion, water foxtail seems to be adequate for spring host of GLH.

• Asian-Australasian Journal of Animal Sciences
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• 제31권8호
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• pp.1169-1175
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• 2018

Objective: The present study was conducted to investigate the impacts of active and passive immunization against synthetic inhibin and steroid-free bovine follicular fluid, respectively, on reproductive fecundity out of breeding season in Iraqi Awassi ewes. Methods: Follicular fluid was aspired from mature bovine follicles, treated with activated charcoal, and used for immunization of male rabbits for obtaining steroid free bovine follicular fluid (SFBFF) antiserum. Forty non-pregnant Awassi ewes were allocated into 4 groups (n = 10 each). At day 38 of experiment, ewes were treated with intra-vaginal MPA sponge (60 mg for 12 days). At days 0, 28, and 50, ewes were treated with 4, 2, and 2 mL of normal saline (control; C-ve), 400, 200, and $200{\mu}g$ of ovalbumin (C+ve), 400, 200 and $200{\mu}g$ of inhibin (SI group), respectively, and 4 mL of normal saline at day 0, and 4 and 2 mL of SFBFF antiserum at days 28 and 50, respectively, (AI group). After mating with Awassi rams, pregnancy and embryo number were diagnosed, at day 38 of pregnancy, using ultrasonography. Blood samples were collected at days 30, 60, 90, and 120 of pregnancy, for assessment of estradiol-$17{\beta}$ (E2) and progesterone (P4) levels. After parturition, numbers of delivered lambs were recorded. Results: The results revealed significant increase of P4 and significant decrease of E2 levels in SI and AI pregnant ewes than controls at days 30, 60, 90, and 120. Newborn number increased significantly in SI and AI treated than control ewes. Conclusion: Active or passive immunization against endogenous inhibin could augment reproductive fecundity out of breeding season in Iraqi Awassi ewes.

• 한국발생생물학회지:발생과생식
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• 제17권4호
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• pp.353-361
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• 2013

The objective of this study was to characterize the reproductive cycle of the chameleon goby, T. trigonocephalus. Gonadal development was investigated using a histological method. Specimens were collected monthly, from April 2009 to March 2010. The gonadosomatic index (GSI) of females began to increase in April, reaching the maximum in May, and declined sharply in August. In males, the GSI began to increase in April and reaching the maximum in July. The annual reproductive cycle of T. trigonocephalus can be divided into four successive stages in females: the growing (November-March), maturing (April-May), ripe and spawning (June-July), and recovery (August-October) stages. Males passed through growing (November-March), maturing (April-June), ripe and spermiation (July-August), and recovery (September-October) stages. These results indicate the spawning season is from June to July. The relationship between fecundity (Fc) and body length (BL) was $Fc=86.1511BL^{2.6506}$. Fecundity was ranged from 3,448-9,654 eggs in a BL of 4.8-7.2 cm and it was increased as BL increased.

• 수산해양기술연구
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• 제54권1호
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• pp.89-95
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• 2018

The maturation and spawning of black scraper, Thamnaconus modestus were studied using samples collected monthly from March, 2015 to February, 2016 in the coastal waters off Middle East Sea, Korea. The gonadosomatic index (GSI) of female was the highest in June. The spawning periods lasted from March to September based on histological observation of female gonad development. The percentage of sexually mature females estimated from a logistic function was over 50% for the size group 18.02 cm (total length, TL). The size of eggs spawned was between 0.40 to 0.58 mm. Fecundity varied between 185,648 and 9,747,250 eggs. The relationship between the fecundity and TL of the fish was expressed in the fecundity equation as $F=0.0297TL^{5.4835}$.

• International Journal of Industrial Entomology and Biomaterials
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• 제11권2호
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• pp.107-111
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• 2005

Impact of microsporidian infection and season on reproductive potential of Bombyx mori L. was investigated in the laboratory. Microsporidian infection significantly (P<0.01) reduced fecundity and hatching and increased sterility and mortality of eggs. Among the microsporidia, Nosema sp. 2 infected silkworm produced eggs with least fecundity and hatching percent as well as highest dead and sterile eggs followed by Nosema sp. 1 and N. bombycis. Microsporidia, in general, significantly reduced fecundity and hatching percent of eggs and increased number of dead and sterile eggs in all the three seasons except N. bombycis in July - August (S3) and Nosema sp. 2 in January February (S1). Since, seed production is the anchor sheet of mulberry sericulture, coefficient of egg lying is considered as an important aspect and the industry quite often facing shortage of disease free layings. The present study indicates that B. mori is more susceptible to microsporidia during S2 followed by S3 and S1 and Nosema sp2. is most virulent followed by Nosema spl. and N. bombycis.

• 한국의상디자인학회지
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• 제5권3호
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• pp.37-48
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• 2003

'Pattern' is of very unique nature in each and every country around the world, and its aesthetic feeling of 'pattern' has been handed down according to its nationality and cultural development process. That is, 'pattern' is ornament to symbolize each country's aesthetic standard or choice through some shape, reflecting social consciousness or religion philosophy. Mostly based upon literature survey and case study, this survey paper analytically compares oriental botanical pattern with occidental botanical figure, which has been influenced by Buddhism-Confucianism and Christian religion respectively. The results show that some patterns are commonly used in both area, while meaning differently in some cases: lotus (life), pomegranate (wealth and prosperity in orient, resurrection in occident), grape (fecundity in orient, wealth in occident), dangcho (fecundity in orient, victory in occident). And the other patterns look uniquely used either just in orient or only in occident. For instance, oriental area had its own patterns such as peony (meaning wealth and honour), peach (longevity), ume flower (happiness), orchid (fecundity); while occidental area used lily (purity), olive (peace), palm (victory), and so on. Interestingly, the botanical patterns were used as main patterns in orient whereas as minor in occident.

• 한국응용곤충학회지
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• 제36권3호
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• pp.277-282
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• 1997

파밤나방(Spodoptera exigua(Hubner))에 미치는 chlorpyrifos-methyl(COM)의 화학적 불임효과를 미량국부처리법으로 조사하였다. 아치사량의 CPM이 5령충에 처리됐고 이로부터 형성된 성충의 산란수와 부화율이 분석되었다. CPM이 처리된 암수의 동계교배 집단에선 충체별 100$\mu\textrm{g}$ 처리집단을 제외하고 처리농도의 차이에 따라 산란수의 차이를 보이지 않았다. 그러나 부화율은 CPM 처리농도에 따라 CPM 처리 집단이 무처리 동계교배 집단에 비해 뚜렸하게 낮았다. 무처리 암수와 CPM(100$\mu\textrm{g}$/충체)으로 처리된 암수를 상호교배한 두 집단들은 암수 모두 CPM으로 처리된 집단과 같은 낮은 산란수 및 부화율을 보였다. 이는 CPM이 우성치사인자의 화학불임제로서 작용했음을 나타냈다. 또 CPM이 이 해충의 유전방제법을 개발하는데 이용될 수 있음을 시사한다.

• 한국수산과학회지
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• 제40권3호
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• pp.141-146
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• 2007

We investigated the reproductive cycle of the striped eel catfish Plotosus lineatus. Specimens were sampled in the coastal waters of Sungsan and Jocheon, east of Jeju, Korea, from September 2001 to August 2002. The gonadosomatic index (GSI) in females and males were reached a maximum in June $(14.18{\pm}10.38)$ and July $(0.35{\pm}0.12)$, respectively. Based on histological observations and GSI variation, the reproductive cycle was classified into the following successive stages: in females, growing (September-April), mature (April-June), spawning (June-July), and degenerative and recovery (July-September) and in males, growing (August-December), mature (September-May), spent (April-July), and degenerative and recovery (June-August). The total length at 100% maturity exceeded 15 cm and the fecundity ranged from 525 to 1176 eggs. The fecundity was correlated positively with total length and body weight. Histological observations of the gonads suggest that this species is a spring-summer spawner with group-synchronous type oocyte development.

• 한국수산과학회지
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• 제53권1호
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• pp.36-42
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• 2020

The maturation and spawning of white crocker Pennahia argentatus were investigated using samples collected in the Southern Sea of Korea from January to December 2018. We analysed monthly changes in maturity stage, gonad-osomatic index (GSI), total length (TL) at 50% group maturity. The spawning period was May to July. Fecundity varied between 71,627 and 888,041 eggs. The relationship between the fecundity and TL of the fish was expressd in the fecundity equation as F=0.2198TL^4.2784 (r²=0.8423). The percentage of sexually mature females estimated from a logistic function was over 50% for the size group 19.33 cm (total length, TL).