• 한국패류학회지
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• 제29권1호
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• pp.65-76
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• 2013

We investigated the gametogenic cycle and spawning seasons of the male Chlamys (Azumapecten) farreri nipponensis by qualitative and quantitative analyses, and also the size at 50% of group sexual maturity was calculated by the data of first sexual maturity. In this study, the male gametogenic cycle of this species by qualitative analysis was divided into five successive stages: early active stage (January to March), late active stage (March to April), ripe stage (April to August), partially spawned stage (July to September), and spent/inactive stage (August to January). The male gametogenic cycle showed similar patterns with monthly changes in the gonadosomatic index and condition index. Particularly, spawning in male scallop occurred once a year from July to September, unlike the spawning period of this species (from June to August) reported by the previous researchers. In quantitative statistical analysis using an image analyzer system, the patterns of monthly changes in the percent (%) of the areas occupied by spermatogenic stages to the testis areas in males showed a maximum in June, and then sharply dropped from July to September, 2006. From these data, it is apparent that the spawning season of C. (A.) farreri nipponensis occurred once per year from July to early September, indicating a unimodal gametogenic cycle during the year. Shell heights at 50% of group sexual maturity (RM50) fitted to an exponential equation were estimated to be 49.90 mm in males (considered to be one year old), and it was 100% for male scallops over 61.0 mm (considered to be two years old).

• 한국수산과학회지
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• 제53권1호
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• pp.98-102
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• 2020

We examined the comparative spawning ecology of daggertooth pike conger Mureanesox cinereus and common pike conger M. bagio in the South Sea of Korea from May 2018 to December 2019. In the South Sea of Korea, the mean total length (TL) of M. cinereus was significantly smaller than that of M. bagio. The sex ratios of both species were skewed toward females. The spawning period of M. cinereus was from June to October, while the spawning period of M. bagio was from August to October. The lengths at 50%, 75%, and 97.5% sexual maturity of M. cinereus females were estimated as 54.6 cm, 60.4 cm, and 74.1 cm TL, respectively. It was not possible to estimate lengths at sexual maturity for M. bagio in the South Sea of Korea due to the absence of immature stages.

• 한국수산과학회지
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• 제8권4호
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• pp.234-241
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• 1975

여수근해산 한전복 Haliotis discus hannai를 재료로 1973년 1월-12월까지 매월 1회씩 24회에 걸쳐 생식선열도지수, 성열도계수, 비만도등의 월변화와 각장 및 전중량의 생식선중량과의 관계, 수온조건 및 자연산모패의 산란유발 결과를 요약하면 다음과 같다. 1. 여수근해산 한전복의 산란가능기간은 5월 하순-7월하순과 9월상순-11월하순이며, 주요산란기는 5월하순-6월중순과 9월하순-11월하순으로 각각 추정되었다. 2. 생식선성열도계수가 극대치를 보인 것은 5월의 44.10과 9월의 49.05였고, 최소치는 1월의 10.09였다. 3. 비만도는 년중 7월이 0.221로 가장 높았으며, 10월에 0.1058로 가장 낮았다. 4. 각장(SL)에 대한 생식선중량(GW)의 비가 년중 가장 높았던 달은 9월이었고, 가장 낮았던 달은 1월로서 이때의 관계식은 9월 : $GW=0.0000003710SL^{3.7860}$ 1월 : $GW=0.000021198SL^{2.8564}$ 각년평균치 : $GW=0.0000005013SL^{4.2273}$ 으로 각각 표시되었다. 5. 전중량(TW)에 대한 생식선중량(GW)의 비가 년중 가장 높았던 달은 9월이었고, 가장 낮았던 달은 1월로서 이때의 관계식은 9 月 : GW=0.1918TW-4.9231 1 月 : GW=0.0992TW-0.1759 주년평균수 : GW=0.1568TW-3.5236으로 표시되었다.

• 한국패류학회지
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• 제28권4호
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• pp.363-375
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• 2012

The gametogenic cycle, the number of spawning seasons per year and first sexual maturiity of the pen shell, Atrina (Servatrina) pectinata, were investigated by quantitative statistical analysis using an Image Analyzer System. Compared two previous results (the spawning periods in the reproductive cycles in 1998 and 2006) by qualitative histological analysis with the present results by quantitative statistical analysis, there are some differences in the spawning periods: the spawning period (June to September) by quantitative statistical analysis was one month longer than those of two previous reports (June to July or June to August) by qualitative histological analysis. However, the number of spawning seasons studied by the qualitative and quatitative analyses occurred once per year. In quantitative statistical analysis using an image analyzer system, the patterns of monthly changes in the percent (%) of the areas occupied by follicles to the ovary area in females (or that of the areas occupied by spermatogenic stages to the testis area in males) showed a maximum in May, and then sharply droped from June to September, 2006. From these data, it is apparent that the spawning season of A. (S.) pectinata occurred once a year from June to September, indicating a unimodal gametogenic cycle during the year. Shell heights of sexually mature pen shells (size at 50% of group sexual maturity, $GM_{50}$) that were fitted to an exponential equation were 15.81 cm in females and 15.72 cm in males (considered to be one year old).

• 한국발생생물학회지:발생과생식
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• 제16권3호
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• pp.205-217
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• 2012

The ovarian cycle, the biological minimum size, and artificial spawning frequency by artificial spawning induction of the female hard clam, Meretrix petechialis, were investigated by histological observations and morphometric data. The ovarian cycle of this species can be classified into five successive stages: early active stage, late active stage, ripe stage, partially spawned stage, and spent/inactive stage. The spawning period was from June to September, and the main spawning occurred between July and August when the seawater temperature exceeds over $20^{\circ}C$. The biological minimum size (shell length at 50% of first sexual maturity) in females were 40.39 mm in shell length (considered to be two years of age), and all clams over 50.1 mm in shell length sexually matured. In this study, the mean number of the spawned eggs by spawning induction increased with the increase of size (shell length) classes. In case of artificial spawning induction for the clams > 40.39 mm, the number of spawned eggs from the clams of a sized class was gradually decreased with the increase of the number of the spawning frequencies (the first, second, and third spawning). In the experiments of artificial spawning induction during the spawning season, the interval of each spawning of this species was estimated to be 15-18 days (approximately 17 days).

• Fisheries and Aquatic Sciences
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• 제13권4호
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• pp.332-339
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• 2010

Maturity and spawning of the snailfish, Liparis ochotensis was investigated based on samples collected by gill net in the East Sea of Korea from December 2008 to December 2009. The average total length of L. ochotensis was 63.4 cm and 64.1 cm for females and males, respectively. Gonadosomatic index (GSI) began to increase in July, reaching a maximum in November, then began to decrease in December. Monthly changes in the GSI values of L. ochotensis were similar for females and males. Annual reproductive cycle of this species can be divided into five successive stages in females: early growing stage (May), late growing stage (June to July), mature stage (August to September), ripe and spent stage (September to December), and recovery and resting stage (January to April). Males show four successive stages; growing stage (May to July), mature stage (August to September), ripe and spent stage (September to December), and recovery and resting stage (January to April). Relationship between total length (TL) and fecundity (F) was F=$0.00003TL^{4.002}$ ($R^2$ = 0.703), and F increased with TL. Total length at 50% group maturity was estimated to be 55.8 cm. Our findings suggest that the spawning period takes place from September to December, with the main spawning period occurring from October to December.

• 한국수산과학회지
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• 제54권6호
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• pp.1000-1006
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• 2021

The maturity and spawning of the common octopus Octopus vulgaris were studied using 317 samples collected monthly from January to December of 2020 from the coastal waters of Yeosu, Korea. The mantle length (ML) of O. vulgaris ranged from 5.1 to 19.7 cm and body weight (BW) ranged from 117.6 to 3,645.4 g. We analyzed monthly changes in sex ratio, gonadosomatic index (GSI), histological maturity stage, and body weight at 50%, 75% and 97.5% group maturity. The sex ratio was 1:1.02, which was not significantly different from the value that expected. Based on histological observation of the gonad development and gonadosomatic index, the spawning periods lasted throughout the year, with peak spawning periods estimated from March to April and July to August. The percentages of sexually mature females estimated using a logistic equation were over 50% at 554.46 g BW, 75% at 1,134.38 g BW and 97.5% at 2,474.22 g BW respectively.

• 한국어류학회지
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• 제35권1호
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• pp.20-29
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• 2023

대륙종개의 산란특성과 산란행동을 규명하기 위해 경기도 가평군 청평면에 위치한 북한강의 지류 상천천에서 2021년 3월부터 5월까지 7회 조사하였다. 전체 조사기간 동안 대륙종개 890개체가 채집되었으며 성비(♂:♀)는 1 : 1.34로 수컷이 암컷보다 많았다. 상천천의 대륙종개는 수온 12~15.7℃인 3월 15일~4월 24일에 산란하였다. 최소 성적성숙개체는 전장 56.7 mm였고 만 1년생 개체였으며, 전장 80.5 mm 이상 개체부터 산란이 관찰되었고 만 2년생 개체였다. 50% 군성숙전장은 67.2 mm로 나타났다. 대륙종개의 복강에 HCG호르몬 10 IU/g으로 주사한 결과, 약 15시간 후에 산란이 유도되었으며 수컷이 암컷의 몸을 원형으로 감는 산란행동이 관찰되었다. 산란 후 암컷과 수컷은 바닥에서 휴식을 취하였고 바닥에 떨어진 수정란은 산란에 참여하지 않은 개체들에게 일부 섭식되었다.

• 한국어류학회지
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• 제18권4호
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• pp.363-367
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• 2006

2003년 4월부터 2004년 3월까지 우리나라 동해안 강원도 양양군 현남면 남애리 연안에서 어획된 참가자미를 대상으로 성숙과 산란에 관한 연구를 수행하였다. 암컷의 생식소 발달과정 및 생식소중량지수의 월 변화로부터 참가자미의 산란기는 2~5월, 주 산란기는 3~4월로 추정된다. 전장 (TL)과 포란수 (F)간의 관계식은 $F=11.307TL^{2.628}$으로 체장이 커질수록 포란수도 증가하는 경향을 보였다. 산란에 참여하는 군성숙체장은 전장 17.8 cm이었고, 이때의 연령은 3세이었다. 전 조사기간에 대한 성비 (암 수)는 60.2 : 39.8로 암컷이 우세하였고, 체급별 성비는 전장 17 cm 이하에서는 수컷의 비율이 높았으나 체장이 커질수록 암컷의 비율이 증가하여 27 cm 이상에서는 전 출현개체가 암컷이었다.

• 한국어류학회지
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• 제22권2호
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• pp.83-89
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• 2010

본 연구는 우리나라 남해안에 서식하는 문치가자미(pleuronectes yokohamae)의 성숙과 산란에 관한 연구로, 2006년 5월부터 2007년 4월까지 경남 남해군 연안 호망어업과 연안자망에서 어획된 것을 무작위로 채집하여 조사하였다. 암컷의 생식소 발달과정 및 생식소 중량지수의 월 변화로부터 문치가자미의 산란기는 11~2월, 주 산란기는 12~1월로 추정된다. 전장(TL)과 포란수(F)간의 관계식은 $F=3.656TL^{3.518}$ ($R^2$=0.872)이며, 체장이 커질수록 포란수도 증가하는 경향을 보였다. 산란에 참여하는 50% 성숙체장은 전장 19.8 cm이었다. 전 조사기간에 대한 성비(암 수)는 55.2:44.8로 암컷이 우세하였고, 체급별 성비는 전장 25 cm 이하에서는 수컷의 비율이 높았으나 체장이 커질수록 암컷의 비율이 증가하여 32 cm 이상에서는 전 출현개체수가 암컷이었다.