Does eel metamorphosis cause a breakdown in the tenets of otolith applications? A case study using the speckled worm eel (Myrophis punctatus, Ophichthidae)

2006 ◽  
Vol 63 (7) ◽  
pp. 1460-1468 ◽  
Author(s):  
Perce M Powles ◽  
Jonathan A Hare ◽  
Elisabeth H Laban ◽  
Stanley M Warlen
Keyword(s):  
Standard Length ◽  
Body Depth ◽  
Otolith Increment ◽  
Increment Formation ◽  
Daily Ring ◽  
Rearing Experiment ◽  
Myrophis Punctatus

Several basic tenets of otolith research have been questioned recently with regard to eel metamorphosis. Specifically, some researchers have suggested that otolith increment formation is not daily, and otolith material may be resorped during metamorphosis. We conducted a rearing experiment to test the hypothesis that increment formation is daily and that the otolith continues to grow during eel metamorphosis. We marked the otoliths of wild-caught Myrophis punctatus leptocephali and reared these fish through metamorphosis. Metamorphosis was characterized by a decreasing standard length, pre-anal length, and body depth accompanied by an increase in pigmentation and a change in behavior. Increment formation was daily or near-daily through metamorphosis, and the otolith continued to grow during metamorphosis. Thus, the basic tenets of otolith application apply to eel metamorphosis, and non-daily ring deposition and resorption should not be used as explanations for otolith characteristics of eels (e.g., back-calculated hatch dates) unless demonstrated experimentally.

scholarly journals A new record of a rare labrid, Suezichthys notatus (Actinopterygii: Labridae), from Taiwan, with comparison to related species from Taiwan

2021 ◽  
Vol 51 (4) ◽  
pp. 393-401
Author(s):  
Chi-Ngai Tang ◽  
Hong-Ming Chen ◽  
Husan-Ching Ho
Keyword(s):  
Lateral Line ◽  
Deep Water ◽  
Standard Length ◽  
Related Species ◽  
New Record ◽  
Head Length ◽  
Body Depth ◽  
Dorsal Fin ◽  
Southwestern Taiwan ◽  
Pelvic Fin

Three specimens of a rare labrid, Suezichthys notatus (Kamohara, 1958) were recently collected from local markets, which were captured from deep-water off northern and southwestern Taiwan, and represent a new record for Taiwan. Suezichthys notatus can be distinguished from its congeners by a combination of characters: scale rows above lateral line 2½; low scaly sheath present at base of dorsal and anal fins; dorsal-fin element IX, 11; anal-fin elements III, 10; lateral line scales 25‒26, each with simple, unbranched laterosensory canal tube; cheek scale rows behind and below eye 2 and 2‒3 respectively; a group of prominent dark blotches extending from the interorbital region dorsoposteriorly; body depth at dorsal-fin origin 3.7‒3.9 in standard length; short pelvic fin without filamentous extension, 2.2‒2.5 in head length. Suezichthys resembles the labrid genus Pseudolabrus, comparison of Taiwanese species of Suezichthys with those of Pseudolabrus are given.

scholarly journals Biometric study of the deep bodied mahseer Tor tor (Hamilton Buchanan) from Ujh River, Kathua (J&K)

2021 ◽  
Vol 16 (3) ◽  
Author(s):  
Monika Bansal ◽  
Ankush Sharma ◽  
Ram Krishan ◽  
Rajesh Kumar ◽  
Koshal Kumar ◽  
...  
Keyword(s):  
Standard Length ◽  
Head Length ◽  
Body Parts ◽  
Monthly Basis ◽  
Body Depth ◽  
Morphometric Characters ◽  
Total Length ◽  
Eye Diameter ◽  
Tor Tor ◽  
External Body

Morphometric characters and meristic count of a fish, Tor tor (Hamilton Buchanan) have been studied from river Ujh, a tributary of river Ravi in District Kathua, (J&K). Collection of samples on monthly basis was conducted for the study of morphological characters of Tor tor. Present study shows some deviations with respect to few morphometric characters and meristic counts that have been aptly discussed in the following discussion. The positive correlation has been observed between total length and external body parts. The highly strong correlated body parameter in relation to total length is standard length (r = 0.98) and least correlated with eye diameter (r = 0.32) and the highly correlated external body part in relation to standard length is caudal length (r = 0.96) and least correlated part is eye diameter (r = 0.35) and also strong correlation was observed between head length and maximum body depth (r = 0.93) and least correlation between head length and eye diameter (r = 0.23). The correlation analysis shows that all the morphometric characters change proportionally with increase in the total length. These results act as baseline data on morphometry of Tor tor which helps in easy identification and will be beneficial for the development of conservational strategies of the natural stocks of Tor tor in river Ujh, Kathua (J&K).

Quantitative trait locus analysis of standard length, body depth and body thickness in mirror carp (Cyprinus carpio L.)

2011 ◽  
Vol 33 (12) ◽  
pp. 1366-1373 ◽  
Author(s):  
Xian-Hu ZHENG ◽  
You-Yi KUANG ◽  
Cui-Yun LU ◽  
Xuan-Peng WANG ◽  
Wen-Sheng LI ◽  
...  
Keyword(s):  
Quantitative Trait Locus ◽  
Quantitative Trait Locus Analysis ◽  
Cyprinus Carpio ◽  
Standard Length ◽  
Quantitative Trait ◽  
Body Depth ◽  
Mirror Carp ◽  
Trait Locus

scholarly journals Two new species of Astyanax (Ostariophysi: Characiformes: Characidae) from eastern Brazil, with a synopsis of the Astyanax scabripinnis species complex

2006 ◽  
Vol 4 (1) ◽  
pp. 53-60 ◽  
Author(s):  
Vinicius A. Bertaco ◽  
Carlos A. S. de Lucena
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Standard Length ◽  
Species Complex ◽  
Body Depth ◽  
Astyanax Scabripinnis ◽  
Interorbital Width ◽  
Eastern Brazil ◽  
Two New Species ◽  
Fin Rays

Two new species of Astyanax are described from eastern Brazil: A . microschemos from the córrego Palmital, rio Itapemirim drainage, Espírito Santo, and A . pelecus from the rio Pardo drainage, Bahia. Astyanax microschemos differs from its congeners by its shallower body depth, 26.9-29.7% of standard length, the presence of one vertically elongate humeral spot that extend above and below the lateral line, smaller interorbital width, 26.9-30.4% of head length, and the possession of 14-18 branched anal-fin rays. Astyanax pelecus differs from its congeners in the possession of only one humeral spot limited to the region dorsal to the lateral line, conspicuous, dark, midlateral body stripe extending from the upper margin of the opercle to the caudal-fin base, a shallower body depth, 26.7-34.8% of standard length, and the possession of 16-18 branched anal-fin rays, 38-39 scales in the lateral-line series, and four scales between the lateral line and the pelvic-fin origin. Astyanax microschemos has a massive head, short snout, usually smaller than the orbital diameter, shallow body depth, and vertically-elongate humeral spot that serve to include it in the A . scabripinnis species complex. A comparative synopsis of this complex is provided.

Validation of daily otolith increment formation in the larval myctophid fish Diaphus slender-type spp.

2005 ◽  
Vol 67 (5) ◽  
pp. 1481-1485 ◽  
Author(s):  
M. Moku ◽  
A. Hayashi ◽  
K. Mori ◽  
Y. Watanabe
Keyword(s):  
Otolith Increment ◽  
Increment Formation ◽  
Myctophid Fish

scholarly journals Sexual dimorphism in black jaw tiliapia (Sarotherodon melanotheron) and banded jewelfish (Hemichromis fasciatus) from the Great Kwa River, Calabar, Nigeria

2017 ◽  
Vol 75 (4) ◽  
pp. 122-131
Author(s):  
Oju Richard Ibor ◽  
George Eni ◽  
Andem Bassey Andem ◽  
Akanimo Joseph ◽  
Azubuike Victor Chukwuka
Keyword(s):  
Sexual Dimorphism ◽  
Discriminant Function ◽  
Discriminant Function Analysis ◽  
Standard Length ◽  
Function Analysis ◽  
Gonad Weight ◽  
Pectoral Fin ◽  
Body Depth ◽  
Sarotherodon Melanotheron ◽  
Fin Length

AbstractIn this study, the pattern and magnitude of sexual dimorphic differences have been investigated in black jaw tilapia (Sarotherodon melanotheron) (n = 160; 74 males and 86 females) and banded jewelfish (Hemichromis fasciatus) (n = 120; 42 males and 78 females) from the Great Kwa River, Calabar, Nigeria. Fish samples were collected between July and December 2015. Fourteen morphometric variables, including body weight, total length, standard length, body depth, cheek depth, pre-orbital length, postorbital length, pectoral fin length (right and left), pelvic fin length (right and left), head length, gonad weight, eye diameter and four meristic variables, including number of pectoral fins (right and left) and number of pelvic fins (right and left), were taken using standard methods. Size-adjusted morphometric measurements subjected to step-wise discriminant function analysis were used to determine predictor variables to morphologically differentiate sexes for both species; magnitude of dimorphism between sexes was estimated using percentage classification accuracy of the discriminant function analysis. From the discriminant function analysis, the pectoral fin length and gonad weight positively contributed significantly to morphometric dimorphism (magnitude=69.2%) in male and femaleS. melanotheronsuggesting adaptation for reproductive function; while forH. fasciatusthe body depth and standard length were important contributors to sexual dimorphism (magnitude=84.2%) suggesting size dimorphism for aggressiveness, territorial behavior and improving swimming performance. Overall, our results indicate that the different magnitude of sexual dimorphism between the two species could be attributable to the type and functional role of sexual dimorphic traits.

Validation of the ageing of 0+ carp (Cyprinus carpio L.)

2003 ◽  
Vol 54 (8) ◽  
pp. 1005 ◽  
Author(s):  
Benjamin B. Smith ◽  
Keith F. Walker
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
South Australia ◽  
Day Range ◽  
Otolith Increments ◽  
Carp Cyprinus Carpio ◽  
Otolith Increment ◽  
Increment Formation ◽  
Scanning Electron ◽  
Age Estimates

Forty carp larvae were reared from eggs spawned in the Torrens River, Adelaide, South Australia, and their otoliths were examined at the time of hatching or at 6, 10, 15 or 20 days after hatching (post-hatch). Using light- and scanning electron microscopy (SEM), otolith increments were counted and compared with known post-hatch ages. Typically, the counts were one day (range 0–2 days) more than the known post-hatch age, but increment formation was daily to at least age 20 days. Thus, age estimates derived from otolith increment counts of wild-caught 0+ carp should be reduced by one day. Comparison with SEM data showed that light microscopy alone offers sufficient resolution for ageing 0+ carp.

Early development of eel-tailed catfish, Tandanus tandanus (Mitchell) (Teleostei : Plotosidae), with validation of daily otolith increment formation

2017 ◽  
Vol 65 (1) ◽  
pp. 12 ◽  
Author(s):  
K. R. Burndred ◽  
B. J. Cockayne ◽  
D. C. Lou
Keyword(s):  
Life History ◽  
Early Life ◽  
Early Life History ◽  
Population Declines ◽  
Length Relationship ◽  
Eastern Australia ◽  
Otolith Increment ◽  
Increment Formation ◽  
Nest Depth

Eel-tailed catfish, Tandanus tandanus, have recently experienced widespread population declines in eastern Australia; with some southern populations facing the risk of extinction, the management and conservation of Queensland populations should be considered a priority. There is a lack of sound, scientific knowledge surrounding the species’ reproductive patterns and early life-history requirements. To assist in clarifying the influence of changes to the natural environment on the reproductive ecology of T. tandanus, we investigated their early life history using naturally fertilised eggs and larvae from a wild population. Nest depth ranged from 0.20 m to 1.35 m, with in situ temperatures between 15.1°C and 29.9°C, and in situ velocities from 0.00 to 0.52 ms–1. Eggs ranged in diameter from 2.6 to 4.0 mm throughout development, and preservation of eggs in ethanol caused significant shrinkage (mean 18.9%). Hatching took 4–7 days (mean 5.29 days; 15.7–28.0°C). Larvae collected from nests ranged in length from 5.1 mm to 15.3 mm SL, and in age from one day old to 16 days old. Larvae are likely to actively disperse from their nest at ~16 days old, as they approach juvenile metamorphosis. Daily otolith increment formation was validated up to 28 days after hatching; and sagittal otoliths were used to develop an age–length relationship for larvae. These results can assist researchers in estimating the timing of critical recruitment events, and investigating how the species’ early life history is influenced by environmental conditions.

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