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1.
K. Pothin † C. Gonzalez-Salas ‡ P. Chabanet § R. Lecomte-Finiger ‡¶ 《Journal of fish biology》2006,69(1):38-53
Sagittal otoliths of the yellowstripe goatfish Mulloidichthys flavolineatus were analysed in order to compare Reunion Island fish stocks with those of Mauritius (south-west Indian Ocean). Conventional otolith morphometric variables (area, perimeter, length and width), shape indices (form factor, roundness, circularity, rectangularity, ellipticity and eccentricity) and Fourier shape analysis were compared between three sites; two in Reunion Island and one in Mauritius. Regional and site-specific differences were found for all the conventional otolith morphometric features. Regarding the shape indices, the differences between sites were best described by form factor, roundness, circularity and rectangularity. A classification by canonical discriminant analysis indicated significant differences between the three sampling sites. The combined use of morphometric variables (size and shape) and external outlines (shape analysis through Fourier series) showed the importance of otolith shape for intraspecific discrimination. 相似文献
2.
In this study 1047 samples of European anchovy Engraulis encrasicolus caught in 2001, 2002 and 2003 in different areas of the Bay of Biscay were examined using otolith shape analysis. For the years 2001 and 2003, 1 year-old individuals were dominant, whereas for the year 2002 they were less common; in contrast 2 year-old individuals represented 74% of the total individuals, suggesting that the fisheries in 2002 were mainly supported by the strong recruitment of 2000. The classification success of the discriminant analysis indicated a strong separation between year groups ( P < 0·001), overall, 98% of individuals were correctly classified. Results from both jackknife and Cohen's kappa procedures confirmed the high rates of classification success obtained by the discriminant analysis (99 and 97%, respectively). Stability in the intraannual shape analysis leads to the idea that individuals were affected by the same intraannual environmental conditions in the Bay of Biscay. Variability in the interannual shape analysis could indicate that the spawning population is composed of European anchovy from different origins every year. In general differences observed suggested that the European anchovy in the Bay of Biscay were members of three or more different communities or entities. 相似文献
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Ramazan Yazici 《Journal of fish biology》2023,102(1):241-247
Few studies have been conducted on the sagittal otolith shape and morphometry of Nemipterus randalli, and none of these studies has examined the effect of sexual dimorphism on the otolith morphology of this species, therefore this study aimed to contribute to knowledge about the otolith morphology of N. randalli, an invasive fish species for the Mediterranean Sea. For this purpose, a total of 132 samples (51 female and 81 male) were obtained from İskenderun Bay with the help of commercial fishermen in November 2018. Relationships between otolith measurements and fish size were determined. Shape indices and elliptic Fourier coefficients were calculated. Significant differences were detected between males and females in all analysis. The sexes were separated from each other using both shape indices and elliptic Fourier coefficients. However, shape analysis was more effective in distinguishing sexes than traditional morphometric analysis. Asymmetry in the otolith morphology of sexes has been attributed to differences in the growth and sexual maturity of male and female fish. The results of this study indicated that sexual dimorphism in Nemipterus randalli was also reflected in the otolith morphology. 相似文献
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Variation in otolith shape (otolith polymorphism) in Hoplostethus atlanticus, Hoplostethus mediterraneus, Paratrichichthys trailli, Pagrus major and Trachurus murphyi , quantified using principal components analysis based on Fourier transform decompositions of outlines of otolith shape, was particularly high among the samples of H. atlanticus from the North Atlantic, New Zealand, Australia and Namibia. The scatter was uniform, however, and did not show any significant differences among regions. The implication drawn from the high variability in otolith shape of H. atlanticus was that otolith shape polymorphism was maintained by some form of balancing selection across many small local environments which may result in k-selection with consequent poor response by H. atlanticus to maximum sustainable yield harvesting strategies. The variation in otolith shape defined by the otolith morphospace of the five species that were measured, showed a decreasing trend in scatter (i.e. decreasing complexity of shape) proceeding from the species with the deepest habitat ( H. atlanticus ) to the most shallow ( T. murphyi ). 相似文献
7.
Bernadette Bounket Pierre Gibert Vincent Gennotte Christine Argillier Georges Carrel Anthony Maire Maxime Logez Fabien Morat 《Journal of fish biology》2019,95(2):444-452
This assesses features of otoliths from laboratory-reared embryos, larvae and juvenile European chub Squalius cephalus from hatching to 180 days post-hatching (dph). We observed the development of the three pairs of otoliths (lapilli, sagittae and asterisci) and more precisely shape changes, as well as timing and deposition rate of increments of the lapilli. The lapilli and the sagittae were present at hatching, whereas the asterisci formed between 20 and 30 dph. The lapillus and sagitta shapes were round until 20 dph. From 60 dph the anterior and the posterior rostra of the sagittae were well developed, but very thin, making this otolith too fragile to manipulate for further studies of shape and validation of otolith increment deposition rate. The lapilli provided reliable age estimates for free embryos, larvae and juveniles up to 120 dph. However, caution should be taken when ageing fish older than 150 dph as an underestimation was noticeable. The regression of the number of otolith increments on age showed a slope and an intercept not significantly different from 1 and 0, respectively, which indicated that otolith growth increments were deposited on a daily basis, with the first microincrement occurring at hatching. Increment counts were consistent between three interpreters, indicating a consistent and reliable age estimate. This study validates that the otolith increment deposition rate can be used to assess hatching dates and daily growth of wild S. cephalus under 150 dph and in environments similar to the conditions used in this study. 相似文献
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Fahimeh Rashidabadi Asghar Abdoli Fatemeh Tajbakhsh Farshad Nejat Esteban Avigliano 《Journal of fish biology》2020,96(2):307-315
The simultaneous use of the scale and otolith morphometry was assessed as a potential tool for the identification of Persian brown trout Salmo trutta stocks of the Lar Lake and five rivers from Lar Basin, Iran. Fourier coefficients (FC) and circularity, rectangularity, roundness, ellipticity and form factor shape indices (SI) were calculated for otolith and scale. Several SIs were significantly different among sites for both structures. Permutational multivariate analysis of variance revealed significant differences between several pairwise comparisons for otolith and scale (FCs and indices separately). Discriminant analysis showed otolith FCs (cross-classification rates: 25–86%) and SI (20–45%) appear to be a relatively acceptable tool to discriminate between several locations. Comparatively, the scale morphometry showed lower discriminatory power (FC = 3–65%; SI = 15–34%), with the exception of SI for Elarm River (60%), Kamardasht River (56%) and Lar Lake (75%). Cross-classification rates improved up to 100% when discriminate analysis incorporating all variables for otolith and scale was performed. The results showed a potential segregation between some water bodies, suggesting that the otolith and scale morphometry could be a useful tool to delimit S. trutta populations in relatively close freshwater environments. 相似文献
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A. Lombarte M. Miletić M. Kovačić J. L. Otero‐Ferrer V. M. Tuset 《Journal of fish biology》2018,92(6):1768-1787
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Akihisa Moriyama Yasunobu Yanagisawa Nobuhiko Mizuno Koji Omori 《Environmental Biology of Fishes》1998,52(1-3):321-329
The embryonic drift pattern of amphidromous Rhinogobius species varies along river courses. It peaks soon after sunset in reaches with gentle gradient on the plains, whereas it occurs throughout the day in steep reaches. Examination of the size of the sagittal otolith and notochord length indicated that the age of embryos drifting in steep reaches varied widely, ranging from 0 to 7 days. Many had exhausted their yolk. We attributed the all-day drift in steep reaches to retention of drifting embryos in slack waters or eddies near the banks. In contrast, most embryos drifting in reaches with gentle gradients were recently-hatched individuals. We estimated that in normal or low river flow most embryos from the upstream reaches perish through starvation before they reach the sea. 相似文献
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M. Kova&#;i&#;† 《Journal of fish biology》2003,63(4):1051-1055
By the aid of SCUBA diving in the Kvarner area (northern Adriatic) from 1993 to 2002 five gobiid species were found to be hyperbenthic. These findings provided specific data on their ecology. 相似文献
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Estimates of pelagic larval duration (PLD) for 10 species of Pomacentridae and two species of Gobiidae were made. In eight of the 12 species examined, within‐population mean PLDs differed between sampling times, locations within regions and among regions. In contrast, the range of these same PLD estimates overlapped at all spatial and temporal scales examined in 11 of the 12 species, but not between regions in one species ( Amphiprion melanopus ). Therefore, despite tight error estimates typically associated with estimates of PLD taken from a particular population at a particular time in some taxa, the overlapping ranges in PLD reported here indicate that the length of the pelagic larval phase is a much more plastic trait than previously appreciated. Within‐species variation in PLD has considerable potential to provide further insights into the ecology and evolution of tropical reef fishes. 相似文献
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次南极电灯鱼矢耳石形态特征具有多样性.为了深入研究其形态特征,利用南设得兰群岛外侧水域采集的456尾次南极电灯鱼(体长范围6.0～8.8 cm)样本,对其矢耳石形态进行分析和判别.根据形态特征将次南极电灯鱼耳石分为4种类型,并采用椭圆傅里叶分析法选取表征耳石类型的77个傅里叶特征系数进行了分析.结果表明: 对4种耳石类型两两比较后发现,具有显著性差异的傅里叶特征系数最多及最少分别占总体的61%和28.6%;对77个傅里叶系数进行主成分分析,前22个主成分解释了总变异的76.6%;选取了17个傅里叶特征系数进行判别分析,建立判别函数,总体判别率为87.2%;根据椭圆傅里叶分析重建的耳石轮廓反映了4种耳石类型间的差异.4种耳石类型在不同体长及体质量的次南极电灯鱼中皆有出现,表明耳石类型具有随机性,且左右耳石类型不一致,表明其左右耳石外形具有差异性.4种耳石类型中,Ⅰ型和Ⅱ型占总体的72.6%,为次南极电灯鱼耳石的主要形态;Ⅲ型和Ⅳ型占总体的27.4%,为次要形态. 相似文献
15.
Nickolai Shadrin 《生物安全学报》2013,22(4):229-236
The variety of aquatic nonindigenous animals in marine habitats worldwide includes more than 16 planktonic Copepoda species. Acartia tonsa is a very successful one, distributed in many seas. Its invasion into European seas was analyzed before (Brylinski,1981), but from that time A.tonsa extended its range in European aquatic habitats. The author describes the history of the A.tonsa invasion into the Ponto-Caspian basin as well as some misleading earlier publications. Morphologic differences between A.clausi and A.tonsa, the neglect of which led to the wrong identification, were examined. The data on A.tonsa and total copepod dynamics in the Sevastopol Bay during the period of 1976~1996 and the same data on the Caspian Sea since 1981 were analyzed. The average size of A.tonsa in new habitats decreased, and its relative density in the Black and Caspian Seas gradually increased. 相似文献
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T. Mille K. Mahe M. C. Villanueva H. De Pontual B. Ernande 《Journal of fish biology》2015,87(3):646-663
This study investigated and compared asymmetry in sagittal otolith shape and length between left and right inner ears in four roundfish and four flatfish species of commercial interest. For each species, the effects of ontogenetic changes (individual age and total body length), sexual dimorphism (individual sex) and the otolith's location on the right or left side of the head, on the shape and length of paired otoliths (between 143 and 702 pairs according to species) were evaluated. Ontogenetic changes in otolith shape and length were observed for all species. Sexual dimorphism, either in otolith shape and length or in their ontogenetic changes, was detected for half of the species, be they round or flat. Significant directional asymmetry in otolith shape and length was detected in one roundfish species each, but its inconsistency across species and its small average amplitude (6·17% for shape and 1·99% for length) suggested that it has barely any biological relevance. Significant directional asymmetry in otolith shape and length was found for all flatfish species except otolith length for one species. Its average amplitude varied between 2·06 and 17·50% for shape and between 0·00 and 11·83% for length and increased significantly throughout ontogeny for two species, one dextral and one sinistral. The longer (length) and rounder otolith (shape) appeared to be always on the blind side whatever the species. These results suggest differential biomineralization between the blind and ocular inner ears in flatfish species that could result from perturbations of the proximal‐distal gradient of otolith precursors in the endolymph and the otolith position relative to the geometry of the saccular epithelium due to body morphology asymmetry and lateralized behaviour. The fact that asymmetry never exceeded 18% even at the individual level suggests an evolutionary canalization of otolith shape symmetry to avoid negative effects on fish hearing and balance. Technically, asymmetry should be accounted for in future studies based on otolith shape. 相似文献
17.
The migratory histories of six Rhinogobius spp., the cross‐band type (R. sp. CB), the large‐dark type (R. sp. LD), the dark type (R. sp. DA), the cobalt type (R. sp. CO), the orange type (R. sp. OR) and R. flumineus, were studied by examining strontium (Sr) and calcium (Ca) concentrations in their otoliths using wavelength dispersive X‐ray spectrometry on an electron microprobe. The Sr:Ca ratios in the otoliths changed both with the ontogenetic development and with the salinity level of the habitat. Most fishes had high Sr:Ca ratios around the otolith core in spite of the fact that those fishes live most of their lives in a freshwater environment. The high ratios in the otoliths were thought to be a physiological effect in those fishes. Thereafter, the Sr:Ca ratios changed remarkably along the life‐history transect, showing intraspecies and interspecies variations. The otolith Sr:Ca ratios of Rhinogobius sp. CB, R. sp. LD and R. sp. CO collected from three rivers connected to the sea were low around the core, subsequently increased sharply to the points 180–345 μm from the core and then decreased again towards the edge. They were thought to reflect the typical amphidromous life history. The R. sp. CO, however, remain in a brackish‐water environment after migration from the sea, while the other species showed typical amphidromous lives with complete freshwater residence after migration from the sea. The five species (R. sp. CB, R. sp. LD, R. sp. CO, R. sp. DA and R. sp. OR) collected above dams had never migrated to the sea, spending their whole life in a freshwater environment, although Rhinogobius species, except for the fluvial type, were thought to have an amphidromous life history according to previous studies. These species are thought to have a landlocked life cycle. The otolith Sr:Ca ratios of R. flumineus showed consistently low ratios towards the edge except for only around the core, although they were collected from a river connected to the sea. These species could have a fluvial life history corresponding to a previous study. The present study clearly suggests that the migratory histories of Rhinogobius spp. are highly different both within and between species and that they have flexible migratory patterns allowing them to utilize the full range of salinity during their life history. 相似文献
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Tanja Schulz‐Mirbach Friedrich Ladich Martin Plath Martin Heß 《Biological reviews of the Cambridge Philosophical Society》2019,94(2):457-482
Otoliths in bony fishes play an important role in the senses of balance and hearing. Otolith mass and shape are, among others, likely to be decisive factors influencing otolith motion and thus ear functioning. Yet our knowledge of how exactly these factors influence otolith motion is incomplete. In addition, experimental studies directly investigating the function of otoliths in the inner ear are scarce and yield partly conflicting results. Herein, we discuss questions and hypotheses on how otolith mass and shape, and the relationship between the sensory epithelium and overlying otolith, influence otolith motion. We discuss (i) the state‐of‐the‐art knowledge regarding otolith function, (ii) gaps in knowledge that remain to be filled, and (iii) future approaches that may improve our understanding of the role of otoliths in ear functioning. We further link these functional questions to the evolution of solid teleost otoliths instead of numerous tiny otoconia as found in most other vertebrates. Until now, the selective forces and/or constraints driving the evolution of solid calcareous otoliths and their diversity in shape in teleosts are largely unknown. Based on a data set on the structure of otoliths and otoconia in more than 160 species covering the main vertebrate groups, we present a hypothetical framework for teleost otolith evolution. We suggest that the advent of solid otoliths may have initially been a selectively neutral ‘by‐product’ of other key innovations during teleost evolution. The teleost‐specific genome duplication event may have paved the way for diversification in otolith shape. Otolith shapes may have evolved along with the considerable diversity of, and improvements in, auditory abilities in teleost fishes. However, phenotypic plasticity may also play an important role in the creation of different otolith types, and different portions of the otolith may show different degrees of phenotypic plasticity. Future studies should thus adopt a phylogenetic perspective and apply comparative and methodologically integrative approaches, including fossil otoliths, when investigating otoconia/otolith evolution and their function in the inner ear. 相似文献
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S. F. Hamrin †† E. Arneri † P. Doering-Arjes H. Mosegaard ‡ A. Patwardhan § A. Sasov &#; M. Schatz ¶ D. Van Dyck H. Wickström M. Van Heel§ 《Journal of fish biology》1999,54(1):223-225
The three-dimensional (3-D) shape and density distribution of a cod otolith was determined using a newly developed micro X-ray tomograph. The technique requires no special treatment of the otolith and could yield the entire 3-D growth history in a single analysis. 999 The Fisheries Society of the British Isles 相似文献
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Vadim J. Birstein Georgii Ruban Arne Ludwig Phaedra Doukakis Rob DeSalle 《分类学与生物多样性》2013,11(2):203-218
The Russian sturgeon, Acipenser gueldenstaedtii, is closely related to three other sturgeon species (A persicus, A. naccarii and A baerii), with populations in the Caspian Sea containing a cryptic lineage with an A. baerii‐like mtDNA profile. Using morphological evidence (morphometrics, meristics) and additional genetic analysis (cytochrome b gene and control region sequencing), cryptic lineages within the Russian sturgeon and their relation to other closely related species of sturgeons are further examined. These data indicate that three genetic forms exist within what is presently known as A. gueldenstaedtii. These forms include the pure A. gueldenstaedtii and A. baerii‐like individuals plus a third rare genetic form whose mtDNA is similar to the mtDNA of the Adriatic sturgeon, A. naccarii. Morphological comparison of the three forms and the Yenisei River A baerii indicates that although the three forms of A. gueldenstaedtii are not different from one another, all three significantly differ from the Yenisei River A. baerii. Competing explanations, including translocation and centre of origin hypotheses are considered. The three geneticforms of A. gueldenstaedtii likely colonized different geographic areas during different geological periods, and subsequently evolved in these regions independently into the species currently recognized as A. gueldenstaedtii, A. naccarii and A. baerii. 相似文献