scholarly journals PERTUMBUHAN, UMUR, DAN DIMORFISME SEKSUAL IKAN PELANGI ARFAK, Melanotaenia arfakensis Allen, 1990 DI SISTEM SUNGAI PRAFI, MANOKWARI, PAPUA BARAT

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Emmanuel Manangkalangi ◽  
Simon P.O. Leatemia ◽  
Luky Sembel ◽  
Paskalina T. Lefaan ◽  
Ridwan Sala ◽  
...  
Keyword(s):  
Growth Rate ◽  
Sexual Dimorphism ◽  
Body Length ◽  
Standard Length ◽  
Body Height ◽  
Growth Patterns ◽  
Male Body ◽  
B Values ◽  
Endemic Fish ◽  
First Maturity

ABSTRACTArfak rainbow fish, Melanotaenia arfakensis is an endemic fish on several river systems in the northeastern part of the Vogelkop peninsula. This study aims to describe the growth, age at first maturity, and sexual dimorphism of this endemic fish on the Nimbai Stream and the Aimasi Stream, the Prafi River system. The fish were caught using handnet, then were measured their standard length and individual weight. Data were analyzed to estimated growth patterns, von Bertalanffy's growth rate, age at first maturity and sexual dimorphism characteristics. The results showed that male growth patterns varied, with a tendency of the increase in body length faster than that of body weight (negative allometric patterns) with b values ranging from 2.886 to 3.132. On the other hand, the female individuals had positive allometric patterns (b values ranged from 3.062 to 3.378). The growth rate (K) of male body length was faster (0.165-0.174) than that of female individuals (0.159-0.163). Male individuals reached the first maturity condition earlier (at age of 1.83-2.18 years) than female individuals (at age of 2.49-2.64 years). Sexual characteristics between the sexes are related to body height starting to appear when fish are of a standard length of larger than 18.22 mm or when male fish begin to approach the time of the first sexual maturity. Understanding of growth, age, and the characteristics of the sexual dimorphism of endemic fish has an important meaning in monitoring population conditions and for conservation efforts in their natural habitat.

scholarly journals Allometric growth patterns in hatchery-reared larvae of the catfish Lophiosilurus alexandri (Pisces: Pseudopimelodidae)

2014 ◽  
Vol 66 (1) ◽  
pp. 284-288 ◽  
Author(s):  
R.J. Guimarães-Cruz ◽  
V.C. Veloso-Júnior ◽  
N.G. Sales ◽  
D.A.A. Oliveira ◽  
J.E. Santos
Keyword(s):  
Standard Length ◽  
Growth Analysis ◽  
Body Height ◽  
Growth Patterns ◽  
Head Length ◽  
Allometric Growth ◽  
Positive Relation ◽  
Initial Development ◽  
Eye Diameter ◽  
Head Height

The aim of the present study was to characterize the relationships that occur between morphometric variables of larvae of Lophiosilurus alexandri Steindachner, 1876 through their allometric growth analysis. Total length, head length and body height were correlated with standard length, head height and body height, as well as eye diameter and head height with head length. The results revealed allometric positive relation during the initial development, where the b coefficient varied between 1.10 and 2.81. The variable pre-anal distance in relation to the standard length and the snout length in relation to the head length revealed an allometric negative relation, where the b coefficient was 0.85 and 0.94, respectively.

A Method of Calculating Body Lengths from Otolith Measurements for Pacific Halibut and its Application to Portlock-Albatross Grounds Data between 1935 and 1957

1962 ◽  
Vol 19 (2) ◽  
pp. 339-362 ◽  
Author(s):  
G. Morris Southward
Keyword(s):  
Growth Rate ◽  
Body Length ◽  
Average Length ◽  
Growth Patterns ◽  
Commercial Fishery ◽  
Young Fish ◽  
Pacific Halibut ◽  
Average Body Length ◽  
Average Body

A change in growth rate of the halibut from the Portlock-Albatross grounds has occurred since the early 1930's. It is possible to measure this change in growth by studying the otoliths of fish taken by the commercial fishery in subsequent years. The calculation of body lengths from otolith measurements has provided a technique of reconstructing the growth patterns of each year-class. This method has been tested using the otoliths of recovered tagged halibut. The percentage deviations from average body length at each age demonstrate an increase in average length with time over the period 1920–1956. This increase is not exhibited among young fish of ages 1 through 4; it starts approximately with age 5 and continues throughout the older ages, where it is pronounced.

The Tasmanian Whitebait, Lovettia seali (Johnston), and the Whitebait Fishery

1950 ◽  
Vol 1 (2) ◽  
pp. 155 ◽  
Author(s):  
M Blackburn
Keyword(s):  
Growth Rate ◽  
Sexual Dimorphism ◽  
Sex Ratio ◽  
Incubation Period ◽  
Standard Length ◽  
Southern Population ◽  
History Of ◽  
One Year

The biology of the aplochitonid Lovettia seali (Johnston), which comprises over 95 per cent. of the Tasmanian whitebait catch, has been studied. Over 78,000 fish from 95 samples were sexed and measured, and 1,200 were classified as to maturity, pigmentation stages, and the presence or absence of food in the stomach. Vertebra counts were made for 1,200 specimens, and there were other observations upon smaller amounts of material. There are marked resemblances to other salmonoids in most points of the biology. There is conspicuous sexual dimorphism. The fish are anadromous and at their ascent are all mature or almost so, and all of the same age (one year by otoliths). After spawning begins there is progressive discoloration and emaciation, followed almost invariably by death. About 0.001 per cent. of the stock consists of two-year fish. The eggs are large compared with the size of fish (extremes of standard length in the adult stock are 33 and 70 mm.) and the incubation period is about three weeks. The larvae drift downstream to the sea. Sex ratio is highly variable, but generally the males greatly outnumber the females. A northern and a southern population can be distinguished, the differences being in growth rate and pigmentation. Each population supports a separate fishery, which operates on the ascending shoals. The history of the fisheries is outlined. The southern fishery has never been important because the fish available at the principal fishing locality are excessively pigmented. More suitable fish could be taken by operating further downstream, where the fish are typically at an earlier stage of maturity. The northern fishery has been vigorously prosecuted and overfishing was probably the cause of the decline in abundance of stock in 1947 and 1948. If there was overfishing, it operated purely by excessive removal of reproducers. The order of the optimum catch is empirically identified and a programme for the management of the stock, aiming at its rehabilitation, is recommended.

Inhibition of smolting in precocious male chinook salmon, Oncorhynchus tshawytscha

1991 ◽  
Vol 69 (7) ◽  
pp. 1848-1852 ◽  
Author(s):  
Chris J. Foote ◽  
W. C. Clarke ◽  
J. Blackburn
Keyword(s):  
Growth Rate ◽  
British Columbia ◽  
Specific Growth Rate ◽  
Body Length ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Specific Growth ◽  
Early Spring ◽  
Growth Patterns ◽  
Precocious Males

The ontogeny of precocious maturation in chinook salmon from Nicola River, British Columbia, was examined in conjunction with the effects of such maturation on smoltification and growth. A high proportion (56%) of male parr matured as yearlings. The growth patterns of precocious males and nonmaturing individuals of both sexes differed significantly. Precocious males appeared to grow rapidly relative to nonmaturing individuals in the early spring, but thereafter displayed a decreasing specific growth rate. In addition, precocious individuals gained more weight per increment of body length than nonmaturing individuals. The seawater adaptability of precocious individuals was lower than that of nonmaturing individuals at the three monthly sampling periods and decreased steadily as maturation proceeded.

Reproductive characteristics of the sand sole Pegusa lascaris (Soleidae), from the eastern-central Atlantic

2008 ◽  
Vol 88 (3) ◽  
pp. 629-635 ◽  
Author(s):  
José G. Pajuelo ◽  
José M. Lorenzo
Keyword(s):  
Sexual Dimorphism ◽  
Sex Ratio ◽  
Reproductive Biology ◽  
Standard Length ◽  
Spawning Season ◽  
Significant Difference ◽  
Males And Females ◽  
First Maturity ◽  
Central Atlantic ◽  
Size At First Maturity

The reproductive biology of 1318 sand sole, Pegusa lascaris, was investigated. This species is a gonochoristic species with no evidence of sexual dimorphism. The overall sex-ratio was 1 male to 0.92 females. Females predominate in the larger size intervals, with a significant difference in mean standard length and range between sexes. Size at first maturity for males and females is attained at 17.2 and 17.7 cm standard length, respectively. Vitellogenesis does not begin synchronously for all females, as a consequence the spawning season appears to be continuous. In each female spawning takes place in two batches which are spawned mainly in spring and autumn, indicating that fish are serial synchronous spawners.

Growth-pattern variation in two species of Rheumatobates (Heteroptera: Gerridae) with different degrees of sexual dimorphism

2008 ◽  
Vol 140 (3) ◽  
pp. 380-384 ◽  
Author(s):  
M.S. Iglesias ◽  
F.A. Crespo
Keyword(s):  
Sexual Dimorphism ◽  
Body Length ◽  
Growth Pattern ◽  
Growth Patterns ◽  
Sexual Differences ◽  
Allometric Analysis

AbstractGrowth patterns of Rheumatobates crassifemur crassifemur Esaki and R. bonariensis (Berg) were compared in a multivariate framework. Study of allometric coefficients in R. bonariensis showed sexual differences biased towards males in antennal and foreleg segments and biased towards females in body length and middle-leg segments. Multivariate allometric analysis of female growth patterns detected variation among species in those characters that are strongly modified in males of R. c. crassifemur. We show that sexual morphology diverges as of nymph V in R. c. crassifemur but only in the adults of R. bonariensis.

scholarly journals Morphometric characters and their relationship in estuarine catfish

1970 ◽  
Vol 6 (2) ◽  
pp. 349-353 ◽  
Author(s):  
M Begum ◽  
Abdullah Al-Mamun ◽  
ML Islam ◽  
MJ Alam
Keyword(s):  
Sexual Dimorphism ◽  
Linear Relationship ◽  
Standard Length ◽  
Head Length ◽  
Pectoral Fin ◽  
Morphometric Characters ◽  
Total Length ◽  
Length Standard ◽  
Eye Diameter ◽  
Males And Females

The morphometric observations were made on total length, standard length, pre-caudal length, head length, eye diameter and depth of body at pectoral fin base of estuarine catfish M. gulio. Males and females showed homogeneity in characters. A linear relationship was found between total length and morphometric characters. Regression of length and weight did not deviate significantly from cube law indicating isometric growth. The fish exhibited sexual dimorphism. Keywords: Morphometric characters; Estuarine catfish; Mystus gulio DOI: 10.3329/jbau.v6i2.4833 J. Bangladesh Agril. Univ. 6(2): 349-353, 2008

Bursaphelenchus michalskii sp. n. (Nematoda: Aphelenchoididae), a nematode associate of the large elm bark beetle, Scolytus scolytus Fabr. (Coleoptera: Curculionidae), in Dutch elm disease-affected elm, Ulmus laevis Pall.

Nematology ◽  
2019 ◽  
Vol 21 (3) ◽  
pp. 301-318
Author(s):  
Marek Tomalak ◽  
Anna Filipiak
Keyword(s):  
Body Length ◽  
Bark Beetle ◽  
Excretory Pore ◽  
Dutch Elm Disease ◽  
Molecular Profile ◽  
Male Body ◽  
Morphometric Characters ◽  
Scolytus Scolytus ◽  
Elm Bark Beetle ◽  
Ulmus Laevis

Summary Bursaphelenchus michalskii sp. n. is described from the bark of the European white elm, Ulmus laevis. All propagative stages of the nematode were found in larval galleries of the large elm bark beetle, Scolytus scolytus, and in overlapping gallery systems of this species and the small European elm bark beetle, S. multistriatus. Dauer juveniles of the new nematode are transmitted to new breeding trees under elytra of adult S. scolytus. Bursaphelenchus michalskii sp. n. is characterised by the female body length of 953 (838-1108) μm and male body length of 893 (811-971) μm, very slender body (a = 53.9 (46.1-58.5) and 60.9 (52.2-72.0) in female and male, respectively), lateral fields with three incisures (two bands), excretory pore usually located anterior to the median bulb, lack of vulval flap, long post-uterine sac, relatively small spicules 12.3 (10.8-13.3) μm long with no cucullus and with distinct, somewhat thorn-like, dorsally bent or reflexed condylus and a conical or digitate rostrum, and the arrangement of the seven male caudal papillae (i.e., a single precloacal ventromedian papilla (P1), one pair of adcloacal ventrosublateral papillae (P2) at or just anterior to cloacal slit, one ventrosublateral, postcloacal pair (P3) located at ca 60% of the tail length, posterior to cloacal slit, and one pair (P4) of ventrosublateral papillae located near the base of the bursa). The newly described species shares most of the key morphological characters with members of the eremus-group (sensu Braasch et al., 2009). However, B. michalskii sp. n. is unique amongst Bursaphelenchus species by a combination of female tail and spicule shape, excretory pore position, and other morphometric characters. These findings were confirmed by DNA sequencing and phylogenetic analysis of the 18S and 28S rDNA regions and by the unique molecular profile of the ITS region (ITS-RFLP).

scholarly journals Left planum temporale growth predicts language development in newborns with congenital heart disease

2018 ◽  
Author(s):  
Andras Jakab ◽  
Eliane Meuwly ◽  
Maria Feldmann ◽  
Michael von Rhein ◽  
Raimund Kottke ◽  
...  
Keyword(s):  
Growth Rate ◽  
Language Development ◽  
Developmental Delay ◽  
Congenital Heart ◽  
Heart Diseases ◽  
Growth Patterns ◽  
Fast Spin Echo ◽  
Planum Temporale ◽  
Brain Growth ◽  
Cerebral Mri

Congenital heart diseases (CHD) are the most common congenital anomalies, accounting for a third of all congenital anomaly cases. While surgical correction dramatically improved survival rates, the lag behind normal neurodevelopment appears to persist. Deficits of higher cognitive functions are particularly common, including developmental delay in communication and oral-motor apraxia. It remains unclear whether the varying degree of cognitive developmental delay is reflected in variability in brain growth patterns. To answer this question, we aimed to investigate whether the rate of regional brain growth is correlated with later life neurodevelopment. 44 newborns were included in our study, out of whom 33 were diagnosed with dextro-transposition of the great arteries (d-TGA) and 11 with other forms of severe CHD. During the first month of life, neonates underwent corrective or palliative cardiovascular bypass surgery, pre- and postoperative cerebral MRI were performed 18.7 ± 7.03 days apart. MRI was performed in natural sleep on a 3.0T scanner using an 8-channel head coil, fast spin-echo T2-weighted anatomical sequences were acquired in three planes. Based on the principles of deformation based morphometry, we calculated brain growth rate maps that reflected the rate of non-linear deformation that occurs between pre- and post-operative brain images. An explorative, whole-brain, threshold-free cluster enhancement analysis revealed strong correlation between the growth rate of the left planum temporale and the posterior operculum of the left frontal lobe and language score at 12 months of age, corrected for demographic variables (p=0.018, t=5.656). No significant correlation was found between brain growth rates and motor or cognitive scores. Post hoc analysis showed that the length of hospitalization interacts with this correlation with longer hospitalization stay results in faster enlargement of the internal cerebro-spinal fluid spaces. Our study provides evidence to the early importance of left-dominant perisylvian regions in language development even before the direct postnatatal exposure to native language. In CHD patients, the perioperative period results in a critical variability of brain growth rate in this region, which is a reliable neural correlate of language development at one year of age.

scholarly journals EVALUASI PERFORMA BOBOT BADAN DAN STATISTIK VITAL SAPI MADURA BERDASARKAN TAHUN KELAHIRAN

2017 ◽  
Vol 5 (2) ◽  
pp. 40
Author(s):  
Sulistyoningtyas I. ◽  
V.M. Ani Nurgiartiningsih ◽  
Gatot Ciptadi
Keyword(s):  
Body Weight ◽  
Body Length ◽  
Animal Health ◽  
Body Height ◽  
Animal Breeding ◽  
T Test ◽  
Female Cattle ◽  
Test Result

This research was done to compare performance of Madura cattle born in 2015 and 2016 at Unit of Technical for Animal Breeding and Animal Health Madura. Two hundred tails of Madura cattle that were one day old, 205 days old, and 365 days old were used in this research. They were offsprings of 12 tails of male cattle and 200 tails of female cattle. Variables observed were body weight, body height, body length, and heart girth. Data collected were analyzed by t test. Result of this research indicated that performance of Madura cattle that was one day old and 205 days old born in 2015 and in 2016 were not different (P>0.05). Performance of Madura cattle that was 365 days old born in 2015 and in 2016 were different (P<0.05). The performance of cattle born in 2015 versus in 2016 were 113.00±12.19 kg vs 120.00±10.86 kg for body weight (yearling weight),  110.00±6.81 cm vs 114.00±2.46 cm for body height, 103.00±6.70 cm vs 106.00±4.71 cm for body length, and 118.00±8.05 cm vs 120.00±5.91 cm for heart girth. It could be concluded that performance of Madura cattle that was 365 days old born in 2016 were higher than that was in 2015. Keywords: Madura cattle, Body weight, Bidy height, Body length, Heart girth

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