共查询到20条相似文献，搜索用时 31 毫秒
1.
One specimen ofPteraclis aesticola was collected off San José del Cabo, Baja California Sur, México (22°54′N, 109°45′W), in March 2007. Present record is the
first reported occurrence of the species in the Tropical Eastern Pacific biogeographic region (Gulf of California to southern
Ecuadorian waters). Its large fan-like anal and dorsal fins and its counts of fin rays and vertebrae can distinguish the Pacific
fanfish from the other species in the genus. This fish may have not yet been recorded in the region because its presence has
been overlooked in the past because of rarity and lack of commercial value. 相似文献
2.
Larval specimens ofHalicampus punctatus were collected off Ulsan and Uljin in December 2002 (three specimens) and off Ulsan in December 2003 (one specimen). These
specimens are characterized by the following morphological characteristics: rings, 14 + 35 = 49; subdorsal rings, 1 + 3 =
4; dorsal fin rays, 19 – 20; pectoral fin rays, 14 – 15; anal fin rays, 9; head length (HL), 5.8 – 6.7 in the standard length;
snout length, 1.9 in HL; snout depth, 3.7 – 5.2 in snout length. The number of caudal fin rays 9 is less than those of the
other species in the same genus 10. Wide stripe bands composed of small pigments are shown in the trunk and the tail. Melanophores
are not found in the dorsal fin, the pectoral fin, and the anal fin except the caudal fin. The supraoccipital crest is on
the head. The frontal ridge is on the dorsal side of front trunk. The blanched ridges on the opercular are fused with a main
ridge like a tree branch. A few branched ridges that are small and narrow on the trunk and the tail are fused with the main
ridges. We report these specimens as the first record in Korea and name them ‘Byeol-silgo-ki’ in Korean. 相似文献
3.
Jina Oh Sung Kim Choong-Gon Kim Ho Young Soh Dawa Jeong Youn-Ho Lee 《Ocean Science Journal》2006,41(1):53-57
A specimen ofAetobatus flagellum was collected at Uljin in June 2005 for the first time in Korea. This specimen is characterized by the cephalic fin, the
long snout, the dorsal fin between pelvic fins, spiracles on the dorsal side of the disc, the deeply notched nasal curtain
and the one row of the teeth in the lower and the upper jaws. And unlikeAetobatus narinari, it does not have any spots on the its dorsal side of the disc. We report this specimen as the first record from Korea and
name it ‘Bak-jui-ga-o-ri’ in Korean. 相似文献
4.
Barik Tapan K. Swain Surya N. Sahu Bijayalaxmi Tripathy Bibarani Acharya Usha R. 《海洋学报(英文版)》2020,39(6):26-35
Marine ecosystems provide a wide variety of diverse habitats that frequently promote migration and ecological adaptation. The extent to which the geographic distribution of marine organism has reshaped by human activities remains underappreciated. The limitations intrinsic to morphology-based identification systems have engendered an urgent need for reliable genetic methods that enable the unequivocal recognition of fish species,particularly those that are prone to overexploitation and/or market substitution. In the present study, however, an attempt has been taken to identify two locally adapted fish species, Siganus sutor(Valenciennes, 1835) and Seriolina nigrofasciata(Rüppell, 1829) of order Perciformes, which happens to be the first record in Odisha coast,Bay of Bengal. The diagnostic characteristics of Siganus sutor are: dorsal fin XIII-10, anal fin VII-9, pectoral fin 15,pelvic fin II-3, while that of Seriolina nigrofasciata dorsal fin VI-I-35, anal fin I-17, pectoral fin 16, pelvic fin 5. All COI barcodes generated in this study were matched with reference sequences of expected species, according to morphological identification. Bayesian and likelihood phylogenetic trees were drawn based on DNA barcodes and all the specimens clustered in agreement with their taxonomic classification at the species level. The phylogeographic studies based on haplotype network and migration rates suggest that both the species were not panmitic and the high-frequency population distribution indicates successful migration. The result of this study provides an important validation of the use of DNA barcode sequences for monitoring species diversity and changes within a complex marine ecosystem. 相似文献
5.
6.
2015年10月中旬,在浙江省舟山市近海的渔业资源调查中采集到天竺鲷标本,经鉴定发现其中黑边银口天竺鲷为浙江新纪录种。本文对采集的6尾黑边银口天竺鲷标本拍摄照片并开展形态特征和DNA条形码研究,对该种的拉丁学名进行校正。黑边银口天竺鲷的有效学名为Jaydia truncata(Bleeker,1854)。具有以下主要形态特征:背鳍鳍条数VII+I,9,胸鳍鳍条数16—17;背前鳞数4;第一鳃弓总鳃耙数3—4+11—13,发达鳃耙数1+9—10,角鳃弓上的鳃耙数9;前鳃盖骨边缘锯齿状;第一背鳍上端黑色,第二背鳍及尾鳍边缘黑色,第二背鳍与臀鳍中部各具一黑色纵纹。本研究分析了浙江海域5种天竺鲷科鱼类的形态差异,并编制了检索表。测定了6尾标本的DNA条形码,结合Gen Bank中所有学名为Jaydia truncata及其同种异名的同源序列分析,发现所有个体明显分为两个分支,且两者遗传距离达到0.149,表明两分支可能为不同的有效种,Gen Bank中只有AB890050和JQ681488与本研究序列结果相近。 相似文献
7.
A single specimen ofAlbula leptocephalus (55.7 mm SL) was collected from the southern coastal waters of Korea using an aquatic lamp. It is characterized
by having a ribbonlike body with a small head and a well-forked caudal fin. Although the general appearance was similar to
the leptocephalus ofA. vulpes including myomere counts and fin ray counts, the melanophore deposition was different from that ofA. vulpes. This leptocephalus specimen was confirmed withA. forsteri using the cytochrome b mtDNA (Cytb) analysis. The genetic distance ofCytb between the present leptocephalus andA. forsteri is 0.006-0.038, which falls into the cutoff point separatingAlbula species into eight deep lineages including the four valid species. Its genetic characteristic have more similarities to those
of Fiji than those of Hawaii and the Northern territory of Australia. 相似文献
8.
The main objective of this study was to apply a set of sensitive non-lethal biomarkers in skin biopsies of fin whales (Balaenoptera physalus) to evaluate the toxicological status of this mysticete in the Pelagos Sanctuary (Mediterranean Sea) and in the Gulf of California (Sea of Cortez-Mexico). We developed a “multi-trial diagnostic tool” (based on field and in vitro studies), combining molecular biomarkers (western blot of CYP1A1, CYP2B) and gene expression (qRT-PCR of HSP70, ERα, AHR, E2F-1) with the analysis of OCs, PAHs and PBDEs. The study revealed a higher level of toxicological stress in the Mediterranean fin whales. 相似文献
9.
M. Trabelsi F. Maamouri J.-P. Quignard M. Boussaïd E. Faure 《Estuarine, Coastal and Shelf Science》2004,61(4):713-723
Current distribution of Atherina lagunae poses an interesting biogeographical problem as this species inhabits widely separate circum-Mediterranean lagoons. Statistical analyses of 87 biometric parameters and genetic variation in a portion of the cytochrome b gene were examined in four populations of A. lagunae from Tunisian and French lagoons. The results suggested a subdivision into two distinct Atherinid groups: one included the French lagoonal sand smelts and the second included the Tunisian ones. Tunisian lagoonal sand smelts were distinguished from the French ones by the lower number of lateral line scales, vertebrae, pectorals and first dorsal fin rays and the higher number of lower and total gillrakers. In addition, A. lagunae from Tunisian lagoons are characterised by short preorbital length, developed operculum, broad interorbital space, larger head, robust body and a relatively small first dorsal fin which is positioned backwards. In addition, intraspecific sequence variation in a portion of the cytochrome b gene was examined in 87 individuals from Tunisia and France. The high correlation between the results of the molecular phylogenetic tree and biometric statistical data analysis suggested that two different sibling species or at least sub-species or semi-species have colonised the lagoons. In addition, our analyses suggested that the evolution of A. lagunae probably occurred in two steps including marine sympatric speciation within the large Atherina boyeri complex and a post-Pleistocene colonisation of the lagoons. 相似文献
10.
中国海域南褐虾属种类记述(甲壳动物亚门, 十足目, 褐虾科) 总被引：2，自引：1，他引：1
为了搞清中国海域存在的南褐虾(Philocheras)的生物多样性和地理分布,作者通过形态学特征系统研究了中国科学院海洋研究所海洋生物标本馆馆藏的南褐虾标本,此标本主要采自中国海域,也检查了部分采自菲律宾海域的标本。本研究和相关文献的结果表明:中国海域存在的南褐虾共计7种,包括作者描绘的4种以及在其他文献中提到的3种。作者对本次研究的4种南褐虾提供了详细的鉴别特征、地理分布、外部整体图和附肢结构图,并对中国海域存在的7种南褐虾提供了检索表。 相似文献
11.
2021年3月在大连进行潮间带生物调查时采集到2个裸鳃类标本,经鉴定发现为欧氏针盘海牛Diaulula odonoghuei (Steinberg, 1963),为中国新记录属和新记录种。在研究中对其进行了活体拍照,利用光学显微镜和扫描电子显微镜对其外部形态和内部解剖特征进行了观察。此外,测定了这两个标本的COI、16S rRNA和H3基因序列,将测得的基因片段与GenBank数据库中的针盘海牛属Diaulula的同源序列进行对比分析,构建了针盘海牛属的系统发育树。欧氏针盘海牛在我国沿海的发现,进一步丰富了中国海软体动物的物种多样性研究。 相似文献
12.
Scorpaena onaria Jordan & Snyder (Scorpaeniformes: Scorpaenidae), previously known only from the northwestern Pacific Ocean, is reported from the southwestern Pacific Ocean for the first time on the basis of 19 specimens. The southwestern Pacific specimens are regarded as a southern population of S. onaria, characterised by a shorter supraocular tentacle and larger body size compared with the northwestern Pacific specimens. The southern population is described in detail including comparisons with all known Indo‐Pacific species of the genus Scorpaena. Analyses of 37 measurements of the southern population of S. onaria found that relative orbit diameter and second anal‐fin spine length became significantly smaller with growth. Initially cycloid, the scales enclosed by the posterior tips of the upper and lower opercular spines and opercular margin change to ctenoid with growth at c. 160–170 mm standard length. A mature female differed from an immature female and males in having a longer upper jaw, steeper dorsal profile of the snout, and shorter nasal spine. As a consequence, the species previously reported as S. neglecta from the Andaman Sea and northwestern Australia was re‐identified as S. onaria. 相似文献
13.
《African Journal of Marine Science》2013,35(1):201-222
Rhinochimaera africana, a new species (Chondrichthyes, Chimaeriformes, Rhinochimaeridae), is described from five specimens from the Western Cape and KwaZulu coasts of southern Africa and from the Moçambique Channel between South-Western Madagascar and Europa Island. Two more specimens are known from off the Agulhas Bank, South Africa. It differs from the partially sympatric R. atlantica Holt and Byrne, 1909, and the Pacific R. pacifica (Mitsukuri, 1895) in its darker coloration, longer, broader, paddle-shaped snout, tooth plates of different shape, a more elongate-oval clasper glans, a shorter caudal fin with very short filament, and possibly a smaller dorsal fin and longer interdorsal space. R. africana males are mature at 568 mm body length (BDL), females adolescent at 476 mm BDL. A large, probably adult female of 650 mm BDL is larger than any recorded R. atlantica or R. africana. Wounds on two specimens indicate possible "cookie-cutter" bites by squaloid sharks, and one has a possible bite by another Rhinochimaera. Data on R. pacifica and R. atlantica, including 45 specimens from off Namibia and South Africa, are presented for comparison with R. africana. Caudal tubercle counts of R. africana (40–46) are intermediate between those of R. atlantica (most with 19–33, rarely up to 43) and of R. pacifica (41–68, rarely as low as 25–34). Southern African R. atlantica agree with North Atlantic R. atlantica in having few caudal tubercles, but there is slight overlap with R. pacifica in the case of higher counts recorded for R. africana. The systematics and distribution of the genus Rhinochimaera are reviewed, a terminology and abbreviation system for morphometries presented, and a key to species provided. The separation of R. atlantica and R. pacifica on caudal tubercle counts is provisionally accepted but considered problematical until adequate samples of both species can be critically compared. Proportional measurements and counts of caudal tubercles were highly variable in Rhinochimaera, with much allometry in proportions with growth and much individual variation. Selected morphometrics are plotted to show allometric trends in proportions that separate R. africana from other species. 相似文献
14.
Jung-Goo Myoung Se Hun Myoung In-Seo Hwang Byung-il Kim Jin-Koo Kim 《Ocean Science Journal》2014,49(1):19-24
Two specimens of Valenciennea helsdingenii and one specimen of Chromis margaritifer were collected on scuba in October 2011 from Jeju Island, Korea. V. helsdingenii is characterized by a body with two dark stripes that connect the head and caudal fin, and a large dark spot between the third and sixth dorsal fin spines. C. margaritifer is characterized by a body that is dark brown anteriorly but white posteriorly at the boundary between the fifth dorsal fin soft ray and the ninth anal fin soft ray. The Korean name ‘Bok-gi-mang-duk-sok’ is proposed for the genus Valenciennea, the name ‘Du-jul-bok-gi-mang-duk’ is proposed for the species V. helsdingenii, and the name ‘Huinggo-ri-ja-ri-dom’ is proposed for C. margaritifer. 相似文献
15.
为探究热带西太平洋海山生物多样性,2016年利用"发现"号遥控无人潜水器(ROV)对西太平洋马里亚纳海沟附近的M2海山进行了采样调查,其中获得了3个深水金相柳珊瑚样本。通过光学显微镜和扫描电镜观察,鉴定其为黑发金相柳珊瑚Metallogorgia melanotrichos(WrightStuder,1889)和长刺金相柳珊瑚Metallogorgia macrospina Kükenthal,1919。这两种金相柳珊瑚均为该区域的新记录种,对其作了详细的形态描述,并依据特征性状对该属所有物种作了分类检索。 相似文献
16.
Tsutomu Ikeda 《Journal of Oceanography》1990,46(6):261-272
Themisto japonica was reared at 1, 5, 8, and 12°C in the laboratory to estimate its intermoult period (IP) and increase in body length (BL) at each moulting (BL).IP was found to be a function of temperature andBL of the specimens, longerIPs being associated with lower temperature and larger specimens.BL was not affected by temperature but increased with growth of the specimens. Observations on consecutive moults indicated that one new segment was added to pleopod rami at each moulting.BLs obtained from the measurement of the segment number of pleopod rami andBL of wild specimens were slightly larger than values obtained from laboratory-raised specimens.IP data obtained from laboratory-reared specimens are combined withBL data from wild specimens to establish a growth model forT. japonica from its release from the marsupium (1.31 mmBL) to the maximum size (17 mmBL) as a function of temperature. This growth model predicts that a total of of 18 moultings is needed forT. japonica to reach the maximum size regardless of temperature, although the time needed to reach the maximum size is highly dependent on temperature. The life cycle, from the newly released larvae (1.31 mmBL) to the spent females (10–17 mmBL), was estimated as 333–593 days at 1°C, 195–347 days at 5°C, 118–210 days at 10°C and 82–146 days at 15°C; the last may be the upper temperature limit forT. japonica. Growth rates ofT. japonica expressed on the basis of body mass are comparable to the rates of euphausiids of equivalent size when the effect of temperature is accounted for. Feeding conditions ofT. japonica in the field are also discussed. 相似文献
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18.
蛟龙号载人潜水器在位于雅普海沟北部6 745 m深处的底栖沉积环境中采集到两只石鳖样本，这是石鳖物种分布于此的新记录。形态学和DNA分子标记均支持两只石鳖为鳞侧石鳖属（Leptochiton）同一物种。该种在形态上与L.vanbellei和L.deforgesi接近；在系统发生方面，与L.vanbellei，L.deforgesi和L.boucheti的亲缘关系密切。这是截至目前世界石鳖分布报道的第三深度记录。 相似文献
19.
Natalia G. Zhukova Valentina N. Nesterova Irina P. Prokopchuk Galina B. Rudneva 《Deep Sea Research Part II: Topical Studies in Oceanography》2009,56(21-22):1959
The purpose of the study is to analyze the state of the Barents Sea euphausiids populations in the warm period (2000–2005) based on the study of their structure dynamics and distribution under the influence of abiotic and biotic factors. For estimation of their aggregations in the bottom layer, the traditional method was used with the help of the modified egg net (0.2 m2 opening area, 564 μm mesh size). The net is used for collecting euphausiids in the autumn–winter period when their activity is reduced, which results in high-catch efficiency. The findings confirmed the major formation patterns of the euphausiids species composition associated with climate change in the Arctic basin. As before, in the warm years, one can see a clear-cut differentiation of space distribution of the dominant euphausiids Thysanoessa genus with localization of the more thermophilic Thysanoessa inermis in the north-west Barents Sea and Thysanoessa raschii in the east. The major euphausiids aggregations are formed of these species. In 2004, the first data of euphausiids distribution in the northern Barents Sea (77–79°N) were obtained, and demonstrated extremely high concentrations of T. inermis in this area, with the biomass as high as 1.7–2.4 g m−2 in terms of dry weight. These data have improved our knowledge of the distribution and euphausiids abundance during periods of elevated sea-water temperatures in the Barents Sea. The oceanic Atlantic species were found to increase in abundance due to elevated advection to the Barents Sea during the study period. Thus, after nearly a 30-year-long absence of the moderate subtropical Nematoscelis megalops in the Barents Sea, they were found again in 2003–2005. However in comparison with 1960, the north-east border of its distribution considerably shifted to 73°50′N 50°22′E. The portion of Meganyctiphanes norvegica also varied considerably—from 10% to 20% of the total euphausiids population in the warm 1950s–1960s almost to complete disappearing in 1970–1990s. The peak of this species’ occurrence (18–26%) took place in the beginning of warm period (1999–2000) after a succession of cold years. The subsequent reduction of the relative abundance of M. norvegica to 7% might have been mostly caused by fish predation during a period of low population densities of capelin. This high predation pressure may therefore have been mediated both by other pelagic fishes (i.e. herring, blue whiting, polar cod) but also by demersal fishes such as cod and haddock. Similar sharp fluctuations in the capelin stock (the major consumer of euphausiids) created marked perturbations in the food web in the Barents Sea in the middle 1980s and the early 1990s. 相似文献
20.
Tenshi Ayukai 《Journal of Oceanography》1986,42(6):487-489
Adult females ofAcartia omorii were allowed to feed on fecal pellets voided by its juveniles (copepodite stages I and II) in a mixture with the diatomThalassiosira decipiens. The rate of filtering of pellets by adult females was 50.3 ±11.5 ml indiv–1 d–1, being twice as high as the rate of filtering ofT. decipiens. 相似文献