• Korean Journal of Ichthyology
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• v.28 no.1
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• pp.41-46
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• 2016

The feeding habits of juvenile (14.0~29.0 mm SL) of Gymnogobius heptacanthus were examined based on 229 individuals, that collected from June to August 2011 in the coastal water of Geoje, Korea. G. heptacanthus fed mainly on copepods which constituted 96.74% in IRI. Barnacle larvae were the second largest dietary component. Its diet also included small quantities of tintinnids, cladocerans and decapods. Graphical analysis of the diet composition showed that G. heptacanthus is a specialized predator characterized by strong individual feeding specialization. Especially copepods were heavily selected by of juvenile G. heptacanthus regardless of prey availability.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.49 no.5
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• pp.635-641
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• 2016

The feeding habits of juvenile and young Seriola quinqueradiata, which were collected by a hand net and set net in coastal waters of the South Sea during the period from June to August 2014 and 2015, were analyzed. The size range of juveniles was 4.9-10.9 cm FL, and that of young S. quinqueradiata was 11.0-20.4 cm FL. Important prey items in the diets of juveniles were euphausiacea and copepoda, dominated by the Euphausia sp., Paracalanus sp. and Calanus sinicus while the diets of the young consisted mainly of pisces, dominated by Engraulis japonicus, Trachurus japonicus. Stomach content compositions differed significantly among body size levels in both the juveniles and young (ANOSIM, P<0.05). With increasing size, the mN/ST constantly decreased while the mW/ST constantly increased (one-way ANOVA). Graphical analysis of the diet composition showed that juvenile S. quinqueradiata are generalized feeders, young is a specialized feeders characterized by strong individual feeding specialization.

• Korean Journal of Ichthyology
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• v.32 no.3
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• pp.143-147
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• 2020

The feeding habits of ocellate spot skate (Okamejei kenojei) were studied by analysis of stomach contents. Specimens of O. kenojei (n=379) were collected in the cosatal waters five west Islands of the Korea, monthly from January to December 2019. The size of O. kenojei ranged from 5.9 to 34.5 cm in disc width (DW). O. kenojei was consumed mainly macrura (77.9%) and pisces (21.9%) in % IRI. But, brachyura, stomatopoda, cephalopods, and others showed a low ratio. The macruara feeding rate was highest in summer, whereas the proportion of pisces was the higher in winter than other seasons.

• Korean Journal of Ichthyology
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• v.20 no.1
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• pp.36-44
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• 2008

Feeding habits of Micropterus salmoides were investigated from the stomach contents of specimens ranging from 13 to 511 mm in standard length (n = 419), which are collected in the Lake Okjeong, Korea, 2006 to 2007. M. salmoides is a very strong carnivorous fish eating living organisms such as lots of fishes, small amount of aquatic insects and shrimps. As they grow, the feeding habits changed : they fed mainly on Branchioda in 10 to 20 mm in SL., aquatic insects and small fishes in 30 to 50 mm in SL., fishes including Zacco platypus, Hemiculter eigenmanni and Rhinogobius brunneus over 50 mm. However, among the prey organisms, M. salmoides most preferred living fishes. Analysing ichthyofauna of the Lake Okjeong from 1981 to the present investigation, after and before introduction of M. salmoides, it was showed that there was a certain reduction in fish diversity. Consequently, it is likely to let the strongly fish-eating habit to reduce a diversity of native fishes in the lake.

• Korean Journal of Ichthyology
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• v.23 no.2
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• pp.163-167
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• 2011

The feeding habits of Coilia nasus were studied using 107 specimens collected from January to December 2005 in the coastal waters off Gori, Korea. The size of C. nasus ranged from 8.4 to 29.5 cm in standard length (SL). C. nasus was a carnivore that mainly consumed shrimps and copepods. Its diet also included small quantities of amphipods, euphausiids and chaetognaths. The feeding strategy graphical method reveled than C. nasus was specialized feeder and showed narrow niche width. Both small and large size class of C. nasus mainly consumed shrimps and copepods, and did not showed significant size-related changes in feeding habits. However, the mean number and weight of preys per stomach was higher than large size class than small size class.

• Korean Journal of Ichthyology
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• v.36 no.1
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• pp.77-83
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• 2024

The feeding habits of shotted halibut, Eopsetta grigorjewi, were studied by examining the stomach contents of 419 individuals. We collected E. grigorjewi samples using offshore gill net and bottom trawl in West Sea of Korea from January to December 2019. The specimens ranged in total length (TL) from 22.5 to 50.3 cm. The main prey organisms were Macrura and Pisces, while Brachyura, Ophiuroidea, Littorinimorpha and Paguridea were found small amounts. E. grigorjewi fed on Macrura in summer and autumn, and mainly fed on Pisces in winter and spring. Smaller individuals (<30 cm TL) consumed Macrura such as Crangon hakodatei. The proportion of these prey items decreased with increasing Pisces such as Ammodytes personatus and Engraulis japonicus. The feeding strategy of E. grigorjewi is estimated to maintain prey individual as they grow, but increase their prey weight.

• Korean Journal of Human Ecology
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• v.5 no.2
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• pp.161-171
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• 1996

In order to provide the basic data on an education program for successful breast-feeding, the nutrition knowledge of and attitudes toward breast-feeding and the factors associated with infant feeding decision among male and female college students were investigated. The majority of students had correct knowledge of the maternal-infant bonding through breast-feeding and knew more about baby-centered benefits than about mother-centered benefits of breast-feeding. Students' attitudes toward breast-feeding were not so positive as expected, and male students had more positive attitudes toward breast-feeding than female students had. 54.8% of students answered to practice breast-feeding longer than 3 months. Nutrition knowledge scores and attitude scores were significantly higher in the breast-feeding decision group than in the formula-feeding decision group. The students residing in a rural community decided breast-feeding significantly more than the students residing in an urban community. It was concluded that nutrition knowledge about the breast-feeding played a significant role in deciding infant feeding method. In order to increase breast-feeding decision rates among college students, the education program may need to focus on understanding of correct nutrition knowledge about the benefits of breast-feeding. Also it would be important to have male students participated in education program.

• Korean Journal of Ichthyology
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• v.34 no.3
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• pp.172-178
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• 2022

To investigate the feeding habits and trophic level of the blackthroat seaperch, Doederleinia berycoides in the South Sea of Korea, fish samples were collected by a bottom trawl net from fisheries resources survey vessels of NIFS in February, May, August and November 2021. The total length (TL) of these specimens was from 3.3 to 33.1 cm. D. berycoides fed majorly on Teleostei (especially Engraulis japonicus) based on index of relative importance (%IRI=64.4%). D. berycoides underwent an ontogenetic dietary shift. Smaller individuals (<10.0 cm TL) fed mainly on amphipods. The proportion of amphipods decreased as body size increased, whereas the consumption of Teleostei increased gradually. Examination of the feeding habits according to ontogentic feeding patterns in the diets of D. berycoides revealed that the mean weight of prey (mW/ST) continuously increased, while mean number of prey (mN/ST) decreased and then increased. The estimated average trophic level of the D. berycoides was 3.62±0.64, ranging from 3.31±0.52 to 3.79±0.70.

• Child Health Nursing Research
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• v.10 no.3
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• pp.300-310
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• 2004

Purpose: To compare normal weight children with obese children in terms of family factors, eating habits, and sociocognitive factors. Method: This study compared 217 obese children with 231 normal standard weight children of 4th-6th graders from 7 elementary schools in Kangwon province. The study also surveyed 817 their parents using questionnaires in which familial factors, eating habits, and sociocognitive factors such as dietary self-efficacy, locus of control and self-esteem were included. Result: Obese children had more obese family members, more family members with chronic metabolic disease, and lower breast-feeding rate than normal weight group. Dietary self-efficacy was positively correlated with eating habits and locus of control while no correlation was found with obesity index.. Self-esteem was negatively correlate with obesity index. Both the parents and the childrens eating habits showed significant positive correlation to the obesity index. Conclusion: These results implied familial factors, eating habits, and sociocognitive factors influenced childhood obesity. Thus, further research targeting to positive attitude toward familial dietary practices combined with significant sociocognitive factors, may lead to prevention and effective management of childhood obesity.

• Korean Journal of Ecology and Environment
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• v.40 no.2
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• pp.337-345
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• 2007

Changes of feeding habitat and feeding organ of a land-locked sweetfish, Plecoglossus altivelis related to their growth process were investigated in the Lake Okjeong, Sannae-myeon, Jeongeup-si, Jeollabuk-do, Korea from 2004 to 2005. In the lake, the post-larvae from 25 to 40 mm in standard length fed mainly on animal organisms such as Copepoda, Branchiopoda and Rotatoria. Also, the juveniles from 50 to 60 mm (SL) fed on Chironomidae of Diptera, Copepoda and Branchiopoda. However, the juvenile from 60 to 70 mm (SL) in the Churyeong Stream fed on animal organisms and aquatic algae, the immature fishes more than 70 mm (SL) fed on only periphyton such as Synedra, Cymbella, Navicula and Pinnularia. Also, the feeding organs of the tooth and stomach were changed according to its growth and food change.