• Korean Journal of Fisheries and Aquatic Sciences
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• v.16 no.1
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• pp.14-16
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• 1983

The present paper deals with seasonal variation of ovary weight, number of eggs spawned and carapace width (CW) of Orithyia sinica (Calappidae, Brachyura) based on the samples monthly collected from May to November 1981. Ovary weight of the prematured crabs (CW, 50 mm) was less than 0.5g. Biological minimum size of the female was approximately 55 mm in carapace width. Ovary weight was 0.01-0.5g in the premature stage, 3.0-15.9g in the virgin stage, and 0.2-1.5g in the ovigerous stage. Number of eggs spawned depended on the size of the females, and it ranged from $240{\times}10^2\;to\;1073{\times}10^2(mean\;ca.542{\times}10^2)$. The diameter of eggs spawned was in the range of 547-913 ${\mu}m(mean ca.712{\mu}m).$

• Korean journal of applied entomology
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• v.7
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• pp.33-37
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• 1969

This experiment was conducted to investigate the vriabibities of the pupal weight and the number of eggs in the ovary of the fall webworm, Hyphantria cunea Drury. collected from the seven different host plants in the field. The correlation between the pupal weight and the number of eggs in the ovary was studied in connection with the species of the host plants. The results obtained were as follows. I) The pupal eight was varied with the species of the host plants and sexes. The order of average female pupal weight was Populus euramericanal Guinier(206.6 mg). Juglans mandshurica Max. (J97.8 mg). Platanus orientalis L. (182.4 mg). Acer neugndo L. (172.2 mg). Taxodium distichum Rich. (172.1 mg). Salix babylonica L. (128.8 mg) and Prunus serrulata var. spontanea (Max). Wilson (103.4 mg). and of the average male pupal weight. T. distichum (125.2 mg). P. orientalis (123.5mg). J. mandshurica (114.4 mg). A. negundo (109.5 mg). Peuramericana (106.3mg). S. babylonica (94.3 mg). and P. serrulata var. spontanea(74.6 mg). The weight of female pupae was greater than that of male pupae in all case. 2) The unmber of eggs in the ovary was also vaied with the species of the host plants. The order of the average number of eggs in the ovary was P. euramericana(1331.1). J. mandshurica(I239.9). T. disichum (1237.0). A. negundo (1186.9). P. orientalis (1145.5), S. babylonica (800.0) and P. serrulata var. spontanea (641.5). 3) The number of eggs in the ovary for all the host plants tested was highly correlated with the pupal weight.

• Journal of Sericultural and Entomological Science
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• v.39 no.1
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• pp.17-21
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• 1997

Oral application of fenoxycarb, O-ethyl N-(2-(4-phenoxyphenoxy)ethyl) carbamate, the commercial formulation Insegar, on the 1st day of the 3rd instar made no difference in the egg laying and the hatchability as compared to 750 grains for the number of eggs laid, 53 grains for the number of the resideual eggs unlaid, 749 grains for the number of fertirized eggs, 97% for the total hatchability, and 95% for the useful hatchability as in the control but on the first day of the 4th instar, the number of the remainder eggs in the ovary increased by 2.4 folds, and reduced number of the eggs laid, number of unfertilized eggs, the hatchabillity and useful hatchability by 39%, by 66%, by 68% and by 72%, respectively. When diluted Insegar was applied topically every other two days from the pupae to the moth at concentration of 10-6, 10-7, 10-8, 10-9, 10-10 the number of eggs laid, the number of the unfertilized eggs, the total hatchability and the useful hatchability were decreased. More severe decrease took place as concentration lowered and the earlier application.

• Korean journal of applied entomology
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• v.4
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• pp.59-64
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• 1965

This study was planned to find out the effects of several food-plants on the pupal weight and the number of eggs in the ovary of the fall webworm, Hyphantria cunea $D_{RURY}$. The larvae were separately reared on different food-plants in the Petri dish. Four to six day old pupae were used for the study of the pupal weight. The number of eggs in the ovary was counted under the binocular dissecting microscope. The loaves of the food-plants were sampled on Juiy 16, and analyzed by Kjeldahl method for the determination of total nitrogen content. The results obtained in this study were as follows; (1) The pupal weights were highly different according to the species of plants and sexes. The greatest pupal weight found in the pupae reared on the mulberry and the least one in the pupae reared on the apple tree. The weight female pupae was greater than that of male pupae in every case. (2) The number of eggs in the ovary was positively correlated to the pupal weight. (3) The nitrogen content of the food-plants used in this experiment was varied with the species of the plants. However, the nitrogen content of the food-plants was not significantly correlated to the pupal weight and the number eggs in the ovary.

• Animal Bioscience
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• v.36 no.4
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• pp.584-590
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• 2023

Objective: This research aimed to explore the changes in the observed abdominal sagging index (ASI) and reproductive performance of Roman male and female geese during the breeding period. Methods: The 339 six-month-old breeding geese (109 male; 230 female) were used in this study, in which five male and five female geese were slaughtered on a monthly basis to record the ASI. Results: The short diameter of the testes of the male goose when the female goose lays eggs and in the second, third, and fourth months was significantly wider than in the fifth months (19.0, 20.8, 21.4, and 19.6 vs 12.7 and 14.0 mm/bird; p = 0.0105). On the other hand, the testicular weight of the male goose in the second and third months after the female goose lays eggs was significantly higher than that in the second and fifth months after laying (0.33% and 0.37% vs 0.11% and 0.19%; p = 0.0212). During the exploring period, the length and weight of the fallopian tube, the weight of the ovary, the number of follicles in 2 to 3 cm, the number of follicles in 3 to 4 cm, the fallopian tube weight in the carcass weight percentage, and the ovary weight in the carcass weight percentage all demonstrated a significant curve response. Further, female ASI was positively correlated with reproductive tract length (r = 0.815; p<0.05) and egg production per female (r = 0.790; p<0.05). Conclusion: The ASI classification method is more objective and easy to distinguish. This scoring method has a high correlation with the number of eggs laid by each goose and the length of the reproductive tract, inferring that the goose observation could take advantage of ASI during egg-laying and can predict the reproductive system development during the laying period and determine when the breeding goose begins to lay eggs.

• The Korean Journal of Ecology
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• v.28 no.4
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• pp.193-198
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• 2005

This study investigated the characteristics of the eggs and yolk sac larvae of Korean striped bitterling, Acheilognathus yamatsutae, spawned and grown In mussels. The number of eggs in the ovary was small ($358{\pm}108$ SD). The eggs were oval and large, and the formation of the perivitelline space was narrow. The eggs were hatched at only 41 hours after fertilization but the hatched larvae were underdeveloped. The development of yolk projection and minute tubercles on the skin surface was notable, along with the vividly moving tail in the hatched larvae. The yolk projection and minute tubercles were disappeared upon enhancement of the motor ability of the larvae was enhanced. The formation of eyes and body pigments of the larvae was relatively delayed in comparison with that of other cyprinid larvae. After completely consuming the yolks the larvae escaped from the mussel for free swimming and exogenous feeding.

• The Korean Journal of Zoology
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• v.36 no.2
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• pp.181-192
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• 1993

The spawning and growth of eightspine stickleback,Pungitius sinensis kaiborae (Tanaka, 19151, were investigated in the Chavang Stream from March 1990 to february 1991 as a part of study on its life history. Nest building, spavming and parental behaviors were similar to those known on the sticklebacks of Europe, North America and Japan. Bht f sinensis kaibarae in the Chayang Stream, peculiarly, showed only superficial gluing behavior in nest building phase and made two nurseries iust behind the nest in Parental Phase. The individuals with fully mature eggs were found from late February to late June. The fecundity of an adult female was about 21 to 110 (mean 47.07) eggs and the diameter of kllv matured ovarian eggs ranged 1.3 to 1.5 mm. The smallest female with fully mature eggs was 25.8 mm in body length and had 21 eggs. The relationship between the number of mature eggs in ovary and body length was No. of eggs = 2.857BL -55.134 (r = 0.890). The number of deposited eggs in a nest was 27 to 637 and thew were composed of several clusters of various developmental stages. The distribution pattern of gonadsomatic index (GSl) against the body length shown that in females 1+ year-old fishes mainly participate in spawning but in males 11 and 2+ year-old fishes equally participate. From the fluctuat지n pattern of GSI and the number of mature eggs in ovary, it was assumed that the spawning season was from February to June and the peak of spawning was early March to late April. The newly hatched vouns was found at late April and their body length was about 10 mm. The vouns (O+) grew rapidly until late August. Then their srowth was slowed down and finallY ceased in midautumn. The young reached about 35 mm BL in their first year of life. The halting of growth was lasted to next Sune when the spawning season would be nearly closed. They (1+) began to grow asain from late june, grew rapidly until tate september and reached about 415 mm BL. Then there was no more grouvth until to die as 2+ yearold fish. Therefore it was assumed that the life span of P. sinensis kaibarae in the Chavang Stream would be about ko years. The relationship between the body length and the body weight was logBW = 2.9541ogBL -4.802 (r = 0.998).

• The Korean Journal of Zoology
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• v.32 no.4
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• pp.337-350
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• 1989

In this study, we compared patterns of hemolvmph with ovarian proteins during the yolk formation of Gewis paludum by using SDS/polyacrylamide gel electrophoresis and he dimen-tlonal electrophoresis. In addition, we examined patterns of glycoprotein which were composed of yolk substances. The results were as follows: The protein patterns in ovary of the 5th instar without eggs were similar to those of adult after ovulation. Protein amounts of the ovaw without developing eggs were less than those of the ovaw containing oocvtes or matured eggs at the molecular weights range from 66, 000 to 110.000 daltons. No glvcoproteins were observed in ovaw without eggs. But the glvcoproteins were gradually increased according to development of eggs in the 5th instar. After the ovulated ovaw of adult, no glvcoprotein bands urere occurred as the bands of the ovary without eggs in the 5th instar. Also, amounts of hemolvmph protein between 66, 000 and 110, 000 in molecular weight were increased during yolk formation of the 5th instal. The results suggest that ovarian protein substances may originate from hemolpnph. In the 5th instar, the amounts of glycoprotein of developing eggs was gradually increased in the hemolymph. The band of M.W. 29, 500 was occurred in the hemolpnph of the 5th instar and adult without eggs. This protein mal be precursor of glvcoprotein in the high molecular weight area in the ovary of more developed eggs. The number of spots and the amounts of protein in ovary without eggs were less than those of ovary containing eggs by two dimensional elec-trophoresis. The protein bands between 45, 000 and 110, 000 almost appeared in acidic field of he dimensional gel. Especially, the band, M.W. 109, 000, uras separated 3 spots, a1, a2, and as. The band, M.W. 102, 000, has spots which designated b1, b2, b3, and b4. Besides, proteins below M.W. 24, 000 were occurred less spots in the basic field than those of acidic field. The mechanism of intracellular organs (= cell organells) uras related to the yolk protein synthesis of oocyte in the process of yolk protein formation of derris pcfudum.

• Fisheries and Aquatic Sciences
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• v.11 no.2
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• pp.98-102
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• 2008

Relationships between total length (TL) and fecundity, body weight and fecundity, ovary length and fecundity, and ovary weight and fecundity of hilsa shad, Tenualosa ilisha Hamilton, collected from Kuakata, Patuakhali, Bangladesh, were studied. During the sampling period, the fecundity of hilsa was found to range from 169,000 (fish TL=28.0cm, weight=250g) to 1,088,000 (fish TL=40.5cm, weight=955g) with a mean of $520{\pm}53{\times}1,000$. The number of eggs per gram of ovary for samples collected from the anterior, middle, and posterior regions of the ovary were also recorded, but no significant variation was found among ovary regions at the 5% level of significance. Fecundity increased with fish TL and weight. The regression equations obtained in arithmetic forms of relationships between TL and fecundity (F), body weight (BW) and fecundity, ovary length (OL) and fecundity, and ovary weight (OW) and fecundity were $F=-887,896+40,511{\times}TL(r=0.85)$, $F=67,577+755.44{\times}BW(r=0.85)$, $F=-562,070+87,668{\times}OL(r=0.75)$ and $F=124,815+6,596.7{\times}OW (r=0.84)$, respectively. The relationships between fecundity and TL, body weight, ovary length, and ovary weight were linear, and the 'r' values were highly significant (p<0.01). These results provide valuable data for the restoration of hilsa resources, which are economically important but have shown reduced productivity in nations adjacent to the Bay of Bengal.

• Korean journal of applied entomology
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• v.60 no.2
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• pp.175-183
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• 2021

As a baseline study of (common name) Locusta migratoria (Orthoptera: Acrididae) to utilize as a food source, we investigated the developmental characteristics of ovaries and eggs. Locusta migratoria had a pair of ovaries and more than 90-104 panoistic ovarioles. The ovary length in the adult stage was longer than it is in the 5th nymph stage. The length on the first day of the adult stage was 2.5-fold longer than the first day of 5^th instar. The ovary length showed a tendency to increase until the 30th day of the adult phase, but decreased from the 35^th day. Ovarioles length was about half of the ovary length, showing a similar tendency to the variation of ovary length. The lengths of the ovaries and the ovarioles increased proportionally to body weight. The matured eggs were identifiable from the 15^th day of the adult stage, and the number was the highest on the 30^th day at 50.6 individuals. Spermatheca size was also affected by the ovary development. The ovaries of L. migratoria were highly matured until the 30th day of adult stage. Weight and size of eggs increased sharply from the 4th day after egg oviposition and remained from the 7th day after spawning. Based on the above results, we found that the ovary of L. migratoria was most developed on the 30th day of adult phase, and 1st nymph is being hatched on the 10th day of the oviposition.