scholarly journals A PRELIMINARY STUDY ON THE GROWTH AND FOOD OF STOLEPHORUS SPP. FROM THE JAKARTA BAY

2018 ◽  
Vol 14 ◽  
pp. 1-30
Author(s):  
Burhanuddin ◽  
Sularto Martosewojo ◽  
Malikusworo Hutomo
Keyword(s):  
Growth Rate ◽  
Standard Length ◽  
Stomach Contents ◽  
Size Group ◽  
Preliminary Study

The length compositions of Stolephorus heterolobus, Stolephorus insularis and Stolephorus  pseudoheterolobus  were observed. S. heterolobus ranged from 25 to 71 mm., S. insularis from 27 to 75 mm and S. pseudoheterolobus from 27 to 67 mm standard length. The  ages  of these  three  species  were estimated. The  asymptotic  length  of S. heterolobus was 97 mm attained at the age of 26 months, S. insularis 86 mm at 26 months and S. pseudohetorolobus 88 mm at 20 months. The highest growth rate of S. heterolobus was at the size group 30 - 80 mm standard length, that of S. insularis was at 30-50  mm, and that of S. insularis was observed to be the lowest. The stomach contents of S. heterolobus and S. pseudoheterolobus   were studied tand were found that the food  of these two  species  was  more or  less the  same. They fed mainly on zooplankton consisting of copepods and other crustaceans.

scholarly journals Estimation of the feeding record of pregnant Antarctic minke whales (Balaenoptera bonaerensis) using carbon and nitrogen stable isotope analysis of baleen plates

Polar Biology ◽  
2021 ◽  
Vol 44 (3) ◽  
pp. 621-629
Author(s):  
Mayuka Uchida ◽  
Ippei Suzuki ◽  
Keizo Ito ◽  
Mayumi Ishizuka ◽  
Yoshinori Ikenaka ◽  
...  
Keyword(s):  
Growth Rate ◽  
Stable Isotope ◽  
Antarctic Krill ◽  
Isotope Analysis ◽  
Stomach Contents ◽  
Annual Growth Rate ◽  
Pleuragramma Antarcticum ◽  
Minke Whales ◽  
Balaenoptera Bonaerensis ◽  
The Antarctic

AbstractAntarctic minke whales (Balaenoptera bonaerensis) are migratory capital breeders that experience intensive summer feeding on Antarctic krill (Euphausia superba) in the Southern Ocean and winter breeding at lower latitudes, but their prey outside of the Antarctic is unknown. Stable isotope analyses were conducted on δ13C and δ15N from the baleen plates of ten pregnant Antarctic minke whales to understand the growth rate of the baleen plate and their diet in lower latitudes. Two to three oscillations along the length of the edge of the baleen plate were observed in δ15N, and the annual growth rate was estimated to be 75.2 ± 20.4 mm, with a small amplitude (0.97 ± 0.21 ‰). Bayesian stable isotope mixing models were used to understand the dominant prey that contributed to the isotopic component of the baleen plate using Antarctic krill from the stomach contents and reported values of Antarctic coastal krill (Euphausia crystallorophias), Antarctic silver fish (Pleuragramma antarcticum), Australian krill spp., and Australian pelagic fish spp.. The models showed that the diet composition of the most recent three records from the base of the baleen plates (model 1) and the highest δ15N values in each baleen plate (model 2) were predominantly Antarctic krill, with a contribution rate of approximately 80%. The rates were approximately 10% for Antarctic coastal krill and less than 2.0% for the two Australian prey groups in both models. These results suggest that pregnant Antarctic minke whales did not feed on enough prey outside of the Antarctic to change the stable isotope values in their baleen plates.

Observations on the Diet of Red Morwong, Cheilodactylus fuscus Castelnau (Pisces : Cheilodactylidae)

1979 ◽  
Vol 30 (1) ◽  
pp. 129 ◽  
Author(s):  
JD Bell
Keyword(s):  
Standard Length ◽  
Stomach Contents ◽  
Rocky Reef ◽  
Major Food ◽  
Seasonal Basis

Stomach contents of 104 C. fuscus (of 275-415 mm standard length) from rocky reef habitats in the Sydney region were analysed. This species was found to be entirely carnivorous, polychaetes, brachyurans, amphipods, gastropods and bivalves comprising the major food types and dominating the diet throughout the year. However, the relative proportions of these food types in the diet were found to vary considerably on a seasonal basis.

Bulk Growth of InGaSb Alloy Semiconductor under Terrestrial Conditions: A Preliminary Study for Microgravity Experiments at ISS

2012 ◽  
Vol 323-325 ◽  
pp. 539-544 ◽  
Author(s):  
M. Arivanandhan ◽  
G. Rajesh ◽  
A. Tanaka ◽  
T. Ozawa ◽  
Yasunori Okano ◽  
...  
Keyword(s):  
Growth Rate ◽  
Grown Crystal ◽  
Space Station ◽  
Growth Direction ◽  
Heating Furnace ◽  
Bulk Crystals ◽  
Bulk Growth ◽  
Microgravity Experiments ◽  
Terrestrial Condition ◽  
Preliminary Study

As a preliminary experiment for the growth of InGaSb alloy crystals under microgravity at International Space Station (ISS), bulk crystal was grown under terrestrial condition using the same gradient heating furnace (GHF). Czochralski grown GaSb <111>B single crystal was used as a seed and feed crystals for the growth of InGaSb bulk crystals. During the growth, heat pulses were intentionally introduced periodically to create the growth striations. From the striations, the growth rate of the grown crystal was estimated. The results show that the growth rate was gradually increased from the beginning of the growth and became stable. On the other hand the In composition of the grown crystal decreased along the growth direction. From the In composition, the temperature gradient in the solution was estimated and it was almost the same of that fixed during the growth.

scholarly journals PERFORMANCE AND HETEROTIC ESTIMATION OF GROWTH IN INTRASPECIFIC CROSSING OF GIANT GOURAMY

2011 ◽  
Vol 6 (1) ◽  
pp. 11
Author(s):  
Didik Ariyanto ◽  
Nunuk Listiyowati
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Standard Length ◽  
Phenotypic Variability ◽  
Hybrid Population ◽  
Hybrid Vigour ◽  
Total Length ◽  
Length Standard ◽  
Commercial Feed ◽  
Intraspecific Crossing

Intraspecific crossing of giant gouramy was done to get better hybrid population. This study was conducted to evaluate the hybrid vigour or heterotic value of the hybrids line, especially for growth rate character. Besides that, we want to know the effect of hybridization on performance of phenotypic variability. Two days post hatching age larvae of four populations i.e. Bastar and Blue-saphire strain, F-1 hybrid and F-1 hybrid reciprocal, were used in this experiment. All fish were reared in aquaria for 30 days period in indoor hatchery. The fish were fed with live food such as Moina and Daphnia for the first ten days, followed by Tubifex for the second ten days and finally, commercial feed were given until the end of the study. The collected data were total length, standard length, and body weight of each population. The results showed that the phenotypic variability of the hybrid population was higher than that of inbred population. Hybrid population from female of Bastar and male of Blue-saphire has better growth than both of its parents. Heterotic values of total length, standard length, and body weight of the hybrid population was 9.5%, 2.9%, and 15.6% respectively. Maternal effect was detected in hybrid population.

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.

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.

Rare earth elements in Fe-Mn nodules from southern Baltic Sea – a preliminary study

2018 ◽  
Vol 472 (472) ◽  
pp. 199-212 ◽  
Author(s):  
Krzysztof Szamałek ◽  
Krzysztof Szamałek ◽  
Szymon Uścinowicz ◽  
Karol Zglinicki
Keyword(s):  
Growth Rate ◽  
Rare Earth ◽  
Average Amount ◽  
Bornholm Basin ◽  
Amorphous Phases ◽  
Lree Content ◽  
Varied Chemical ◽  
Preliminary Study ◽  
Main Components ◽  
Total Average

Between 1976–1990, the Polish Geological Institute performed geological works in the Polish Maritime Areas. During these works, 260 occurrences of concretions were recorded from 7,500 sampled sites. In 1980, the threshold that separates the Bornholm Basin from the Słupsk Furrow was mapped. Numerous Fe-Mn nodules on the seabed were found in that area. The results of detailed analyses of nodule samples collected from four sites are presented in this paper. Analyzed nodules represent discoidal D, irregular I, and transitional D-I types. The nodules are characterized by varied chemical composition of main oxides (Fe, Mn). The maximum Fe2O3 content is 26.63% and MnO 23.18%. Total average amount of REE + Y in the samples is approximately 165.11 ppm, ΣLREE 145.72 ppm and ΣHREE 19.39 ppm. The LREE content is enriched in comparison to HREE. The majority of nodules consist of Fe-Mn oxy-hydroxide minerals with very low crystallinity (practically amorphous phases). The main confirmed Mn-phases are birnessite and todorokite. Other main components of the nodules are: detrital quartz, albite, microcline, glauconite and muscovite, clinochlore, and clay minerals: illite and chlorite. The rate of growth of Fe-Mn nodules has been estimated using a cobalt chronometer. The nodule growth rate ranges from 0.006 to 0.134 mm/yr –1. Based on the Fe, Mn and (Cu + Co + Ni) contents, the origin of studied nodules is determined as hydrogenetic, while using REE (Cesn/Cesn · vs. Nd) – as diagenetic.

scholarly journals Length-weight relationship, morphometric characters, and meristic counts of the coldwater fish Crossocheilus diplochilus (Heckel) from Dal Lake

2021 ◽  
Vol 29 (1) ◽  
pp. 29-34
Author(s):  
Muzamil Sidiq ◽  
Imtiaz Ahmed ◽  
Yahya Bakhtiyar
Keyword(s):  
Growth Rate ◽  
Body Size ◽  
Correlation Analysis ◽  
Standard Length ◽  
Fork Length ◽  
Meristic Characters ◽  
Morphometric Characters ◽  
Dal Lake ◽  
Total Length ◽  
Meristic Counts

Abstract Morphometric and meristic characters are very important for the identification of any fish specimen. The present study aims to describe the morphometric and meristic characters of the indigenous fish Crossocheilus diplochilus (Heckel) from Dal Lake. This fish is commonly known as Kashmir latia and is called tether locally. In the present study, the material analyzed was 70 specimens ranging in size from 6.9–13 cm (TL) with a mean length of 10.8 cm and a weight range of 3.2–24.0 g with a mean weight of 10.1 g. The parameters with the highest correlations with total length were standard length and fork length at 0.983 and 0.989, respectively. Correlation analysis showed that all morphometric characters changed proportionally as total length increased. The meristic counts analyzed in the present study remained constant in fish of different sizes indicating that they are independent of body size. The study of morphometric characters is very important to determine the growth rate of these fish, which, in turn, is required to properly manage its populations.

scholarly journals Influence of feeding regimen on growth parameters of African Catfish (Clarias gariepinus, Burchell 1822)

2019 ◽  
Vol 46 (3) ◽  
pp. 192-204
Author(s):  
O. T. F. Abanikannda ◽  
A. A. Jimoh ◽  
K. O. Bakare ◽  
S. A. Shitta ◽  
Z. F. Shopeyin
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Standard Length ◽  
Condition Factor ◽  
Average Daily Gain ◽  
Clarias Gariepinus ◽  
African Catfish ◽  
Total Length ◽  
Final Weight ◽  
Feeding Regimen

An experiment was conducted using 270 African catfish fingerlings to evaluate the effects ofdifferent feeding regimen on growth performance of the fish. The fish were hatched andreared to 12 weeks under similar condition before the commencement of the experiment thatlasted for 40 days. Feeding regimens included equally shared feed based on recommended of5% body weight, and equally spaced feed allocation at 6, 8 and 12 hourly intervals. Each ofthe three treatment groups comprised of six replicates of 15 fish per plastic tank. Body weight,and two linear measurements (total and standard length) were taken twice weekly on each ofthe fish in all the tanks and the respective length-weight relationship and condition factor (K)were computed. Weekly gain, final weight, average daily gain, absolute, relative, specific andmean growth rates for the three groups were evaluated and compared. Results showed that allparameters studied except final total length were significantly (P<.05) affected by feedingregimen. The coefficient of determination for all ANOVA had variable values for all growthparameter; Final Weight (83.11%), Absolute Growth Rate (79.19%), Final Total Length(61.30%), Final Standard Length (60.87%), Relative Growth Rate (38.68%), SpecificGrowth Rate (35.57%), Mean Growth Rate (32.23%) and Condition Factor (12.83%). The 6-hourly treatment group mostly had the highest values across all the parameters studied butwas not statistically different (P>.05) from the values obtained in the 8-hourly group.

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