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디지털 색채 분석을 이용한 보구치(Pennahia argentatus) 생식소의 성숙도 판정
정재묵,김영혜,문경진,최석진 한국수산과학회 2024 한국수산과학회지 Vol.57 No.2
The present study investigated the digital color characteristics corresponding to different maturity stages and maturation levels of white croaker Pennahia argentatus specimens collected from the Southern Sea of South Korea. Maturity stages were determined using photomicrographs depicting ovarian developmental phases and compared with digital color values. The specimens ranged in body length from 21–36 cm, with mature ovaries observed within the 24–30 cm length range. To differentiate the maturing, mature, spawning, and post-spawning stages of the gonads, boundary lines were established based on specific coordinates. For the ovaries, a dividing line was drawn through (–10, –10) and (15, 5), described by the equation Y=3/5X-4; while for the testes, the line passed through (20, 0) and (0, 15), indicated by the equation Y=-3/4X+15. However, the visual determination of the maturity stages proved challenging due to overlapping color values. Consequently, this study underscores the efficacy of employing digital color measurements over subjective visual assessments to evaluate the maturity of white croaker gonads and offers more quantitative insights.
한국 남해에 출현하는 만새기(Coryphaena hippurus)의 식성
정재묵,최정화,임양재,김정년,Jeong, Jae Mook,Choi, Junghwa,Im, Yang-Jae,Kim, Jung Nyun 한국수산과학회 2017 한국수산과학회지 Vol.50 No.5
Feeding habits of dolphinfish Coryphaena hippurus, were analyzed. Fish samples were collected by using a purse seine, fishing and set net in the southern sea of Korea from January to December 2015. The size of C. hippurus ranged from 23.8 to 127.4 cm in fork length. The species with the highest percent index of relative importance (%IRI; the most important prey taxa) in the diets of C. hippurus were teleosts and cephalopod, including Engraulis japonicus, Thamnaconus modestus and Trachurus japonicus, Loligo edulis was the most frequently consumed cephalopods. Coryphaena hippurus also ate small amounts of amphipods and carid shrimp. The dietary compositions of C. hippurus was not significantly different among size classes or seasons (ANOSIM, P>0.05). As body size of C. hippurus increased the mean number of prey per stomach (mN/ST) tended to decrease, but the opposite trend was evident for mean weight of prey per stomach (mW/ST). The mN/ST and mW/ST also significantly varied with season (one-way ANOVA, P<0.05).
한국 남해에 출현하는 가고시마샛멸(Argentina kagoshimae)의 섭식생태
정재묵,이승종,백근욱 한국수산과학회 2022 한국수산과학회지 Vol.55 No.5
We analyzed the diet composition of smallmouth argentine Argentina kagoshimae, which were collected via bottom trawl in the South Sea during February, April, August, and October 2021. Their size range was 8.1–21.4 cm total length. A. kagoshimae are mesopelagic carnivores, mainly consuming benthopelagic Euphausiacea and Caridea crustaceans. Polychaetes were the second largest prey component in their diet, which also included small quantities of copepods, amphipods, and arrow worms. Stomach content compositions substantially differed among body size levels in A. kagoshimae. The results of non-metric multidimensional scaling ordination and permutational multivariate analysis of variance of dietary data revealed no significant dietary differences. The results of a graphical analysis of the diet composition showed that A. kagoshimae are specialized feeders characterized by strong individual feeding specialization.
한국 남해안에 출현하는 방어(Seriola quinqueradiata) 치어 및 유어의 식성
정재묵 ( Jae-mook Jeong ),황강석 ( Kang-seok Hwang ),송세현 ( Se-hyun Song ),김희용 ( Hee-yong Kim ),박정호 ( Jeong-ho Park ),이정훈 ( Jung-hoon Lee ) 한국수산과학회(구 한국수산학회) 2016 한국수산과학회지 Vol.49 No.5
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.
정재묵 ( Jae Mook Jeong ),박주면 ( Joo Myun Park ),허성회 ( Sung Hoi Huh ),김현지 ( Hyeon Ji Kim ),백근욱 ( Gun Wook Baeck ) 한국어류학회 2015 韓國魚類學會誌 Vol.27 No.1
주둥치의 위내용물 분석에 이용된 개체는 총 350개체로 가덕도 주변해역에서 2010년 10월부터 2011년 9월까지 매월 채집하였다. 주둥치의 체장범위는 3.0~9.8 cm를 보였다. 주둥치는 주로 요각류와 게류 유생, 새우류 유생, 갯지렁이류 등을 섭식하는 육식성 어류로 확인되었다. 그 외에 난바다곤쟁이류, 단각류, 이매패류 유생, 복족류 유생 등도 발견되었지만, 그 양은 많지 않았다. 주둥치는 성장함에 따라 주요 먹이생물을 전환하였는데 3~5 cm 사이의 개체들은 요각류를, 5~7 cm 사이의 개체들은 게류 유생과 새우류 유생을, 8~10 cm의 개체들은 갯지렁이류를 주로 섭식하였다. 체장이 증가함에 따라 먹이생물의 무게는 유의하게 증가하였다. The diet composition of Leiognathus nuchalis were studied using 350 specimens col-lected from October 2010 to September 2011 in the coastal waters of Gadeok-do, Korea. L. nuchalis was carnivorous feeder that consumed mainly copepods, crab larvae, and shrimp larvae. Its diet also included small quantities of polychaetes, amphipods, euphausiids, bivalve larvae, and gastropod larvae. The size of L. nuchalis ranged from 3.0 to 9.8 cm in body length (BL). L. nuchalis underwent an ontogenetic dietary shift. 3~5 cm size individuals fed mainly on copepods. 5~7 cm size individuals fed mainly crab larvae and shrimp larvae. 8~10 cm size individuals fed mainly polychaetes. The size increases, the weight of food organisms are constantly increased.
순천 상내리 갯골에 출현하는 농어(Lateolabrax japonicus) 치어의 식성
정재묵 ( Jae Mook Jeong ),김현지 ( Hyeon Ji Kim ),예상진 ( Sang Jin Ye ),염시동 ( Si Dong Yoem ),박종혁 ( Jong Hyeok Park ),백근욱 ( Gun Wook Baeck ) 한국수산해양기술학회 2015 수산해양기술연구 Vol.51 No.2
During the study periods, total 143 individuals of Lateolabrax japonicus were collected. Body length (BL) range was 2.0.11.8 cm. Empty stomach occurred in 8.4%. The most abundant prey was copepods. Among copepods, Tigriopus japonicus was the most abundant prey appeared 32.1 in %F. Next important prey was shrimps and mysids. The results of analysis in ontogenetic changes, main prey of two small size classes (2.0.3.9 cm, 4.0.5.9 cm) were copepods. Thereafter, copepods percentage was decreased, but shrimps, mysids, fishes percentage was increased by increasing body length from 8.0 cm< size class.