scholarly journals Embriogenesis and larval ontogeny of the "piau-gordura", Leporinus piau (Fowler) (Pisces, Anostomidae) after induced spawning

2004 ◽  
Vol 21 (1) ◽  
pp. 117-122 ◽  
Author(s):  
Fábio Luiz Borçato ◽  
Nilo Bazzoli ◽  
Yoshimi Sato
Keyword(s):  
Embryonic Development ◽  
Water Temperature ◽  
Larval Development ◽  
Exogenous Feeding ◽  
Histological Techniques ◽  
Final Development ◽  
Complete Absorption ◽  
Vegetative Pole ◽  
Males And Females ◽  
Embryonic And Larval Development

Mature males and females of Leporinus piau (Fowler, 1941) were induced to reproduce through a hypophysation process. Extrusion occurred 12 h or 312 hours-degree after the hypophysation, at a water temperature of 26°C. Fertilized eggs were maintained in incubators at 24°C. Embryonic development, was evaluated using every 10 minutes, fresh egg samples which were analyzed under stereoscopic microscope. The larvae were collected at 24-hour intervals for seven days after hatching, fixed in Bouin's fluid and were submitted to routine histological techniques. The eggs of L. piau were slightly gray, non-adhesive and round-shaped. After 1.5 h the embryo was at the 64-blastomere phase and showed a wide yolk region on the vegetative pole. Within 6.25 h, blastopore closure and the end of gastrula was observed. The differentiation of layers occurred after 7.5 h and hatching after 21 h after fertilization at 24°C or 504 hours-degree. During the first three days of the larvae development there was a gradual yolk sac reduction until its complete absorption on the fourth day, indicating the necessity of exogenous feeding. From the fourth to the seventh day, the final development of the heart, gill arches, swimblader, kidney, hepatopancreas, stomach and intestine were observed. The embryonic and larval development of L. piau were similar to other Anastomidae species.

Effect of temperature during embryonic development and first feeding of Trichogaster leeri larvae

Zygote ◽  
2016 ◽  
Vol 24 (5) ◽  
pp. 733-741
Author(s):  
Samuel Louzada Pereira ◽  
Dalcio Ricardo de Andrade ◽  
Marcella Costa Radael ◽  
João Carlos Fosse Filho ◽  
Rafael Vieira de Azevedo ◽  
...  
Keyword(s):  
Embryonic Development ◽  
Water Temperature ◽  
Larval Development ◽  
Environmental Factor ◽  
Effect Of Temperature ◽  
Hatching Rate ◽  
Egg Incubation ◽  
First Feeding ◽  
Incubation Temperatures ◽  
Embryonic And Larval Development

SummaryTemperature is an environmental factor that influences the development of fish, and when changed abruptly can lead to high mortality. Some species of fish are influenced by this factor, exhibiting a longer time for embryonic development and time to first feeding. This study aims to evaluate the effect of water temperature on embryonic and larval development up to first feeding, to describe the time in hours post fertilization (hpf) of the emergence of different structures and to determine the best hatching rate and survival of animals under different treatments. Five different egg incubation temperatures were used (24, 26, 28, 30 or 32°C, respectively). The eggs were observed at regular intervals of 30 min up to 24 h, every 2 h until 48 h and every 4 h until the display of first feeding in all treatments. Embryonic development was longer for eggs incubated at 24°C and the best results for hatching rate and survival of spawning efficiency were at 28°C. We recommend that incubation of Trichogaster leeri eggs is carried out at 28°C up to the first feeding of larvae.

Increased water temperature interrupts embryonic and larval development of Indian major carp rohu Labeo rohita

2021 ◽  
Author(s):  
Mohammad Ashaf-Ud-Doulah ◽  
S. M. Majharul Islam ◽  
Md Mahiuddin Zahangir ◽  
Md Sadiqul Islam ◽  
Christopher Brown ◽  
...  
Keyword(s):  
Water Temperature ◽  
Larval Development ◽  
Labeo Rohita ◽  
Indian Major Carp ◽  
Embryonic And Larval Development

Neurogenesis in the thoracic neuromeres of two crustaceans with different types of metamorphic development

1998 ◽  
Vol 201 (17) ◽  
pp. 2465-2479 ◽  
Author(s):  
S Harzsch ◽  
J Miller ◽  
J Benton ◽  
RR Dawirs ◽  
B Beltz
Keyword(s):  
Embryonic Development ◽  
Larval Development ◽  
Neuronal Development ◽  
Temporal Patterns ◽  
Homarus Americanus ◽  
Spider Crab ◽  
Larval Life ◽  
Larval Stages ◽  
Metamorphic Development ◽  
Embryonic And Larval Development

The mode of embryonic and larval development and the ethology of metamorphosis in the spider crab and the American lobster are very different, and we took advantage of this to compare neuronal development in the two species. The goals of this study were to discover whether the differences in the maturation of the neuromuscular system in the pereopods and the metamorphic changes of motor behavior between the two species are reflected at the level of the developing nervous system ('neurometamorphosis'). Furthermore, we wanted to broaden our understanding of the mechanisms that govern neuronal development in arthropods. Proliferation of neuronal stem cells in thoracic neuromeres 4-8 of the lobster Homarus americanus and the crab Hyas araneus was monitored over the course of embryonic and larval development using the in vivo incorporation of bromodeoxyuridine (BrdU). Neuropil structure was visualized using an antibody against Drosophila synapsin. While proliferation of neuronal precursors has ceased when embryogenesis is 80 % complete (E80%) in the lobster thoracic neuromeres, proliferation of neuroblasts in the crab persists throughout embryonic development and into larval life. The divergent temporal patterns of neurogenesis in the two crustacean species can be correlated with differences in larval life style and in the degree of maturation of the thoracic legs during metamorphic development. Several unusual aspects of neurogenesis reported here distinguish these crustaceans from other arthropods. Lobsters apparently lack a postembryonic period of proliferation in the thoracic neuromeres despite the metamorphic remodeling that takes place in the larval stages. In contrast, an increase in mitotic activity towards the end of embryonic development is found in crabs, and neuroblast proliferation persists throughout the process of hatching into the larval stages. In both E20% lobster embryos and mid-embryonic crabs, expression of engrailed was found in a corresponding set of neurons and putative glial cells at the posterior neuromere border, suggesting that these cells have acquired similar specific identities and might, therefore, be homologous. None of the BrdU-labeled neuroblasts (typically 6-8 per hemineuromere over a long period of embryogenesis) was positive for engrailed at this and subsequent stages. Our findings are discussed in relation to the spatial and temporal patterns of neurogenesis in insects.

Embryonic and larval development and segment formation in Ibla quadrivalivis Cuv. (Cirripedia).

1965 ◽  
Vol 13 (1) ◽  
pp. 1 ◽  
Author(s):  
DT Anderson
Keyword(s):  
Embryonic Development ◽  
Larval Development ◽  
Larval Growth ◽  
Growth Zone ◽  
Larval Survival ◽  
Direct Development ◽  
Gut Development ◽  
Free Swimming ◽  
Phylogenetic Affinity ◽  
Embryonic And Larval Development

Embryonic development in I. quadrivalvis follows the typical cirripede pattern except for modifications of cleavage and of development of the gut, associated with a large yolky egg. The nauplius is free-swimming but lecithotrophic. It does not grow, and moults irregularly. The development of cypris features begins precociously and the second half of naupliar life is demersal. The cypris stage is unmodified. Settling was not observed. The maxillary segments develop as a delayed continuation of the naupliar segmental sequence, the thoracic segments from a growth zone of seven ectoteloblasts and eight mesoteloblasts. Each row of eight cells budded from the mesoteloblasts develops into the paired somites of a segment. The midgut develops independently of the yolk cells. In cirripedes, increased yolk results in modification of cleavage and gut development but otherwise has little influence on embryonic development. Larval modifications associated with lecithotrophy promote direct development of the cypris but do not include modification of the cypris. Irregularity of moulting is associated with lack of larval growth. Relative brood sizes suggest that increased yolk in cirripedes offers advantages in larval survival. Post-naupliar segment formation in cirripedes resembles in detail that of Malacostraca, indicating a possible phylogenetic affinity between Malacostraca and Maxillopoda which can be tested by further studies on segment formation in non- Malacostraca.

Characterization and expression patterns of wnt4 in Exopalaemon carinicauda (Holthuis, 1950) (Caridea, Palaemonidae) during embryonic and larval development

Crustaceana ◽  
2019 ◽  
Vol 92 (1) ◽  
pp. 83-94
Author(s):  
Jian Hua Chen ◽  
Meng Jie Wang ◽  
Xue Li ◽  
Hai Hua Wang ◽  
Huan Gao ◽  
...  
Keyword(s):  
Embryonic Development ◽  
Larval Development ◽  
Developmental Stages ◽  
Integration Site ◽  
Expression Patterns ◽  
Exopalaemon Carinicauda ◽  
Cell Stage ◽  
Larval Stages ◽  
Cell Proliferation And Differentiation ◽  
Embryonic And Larval Development

Abstract Wnt4 (Wingless-type MMTV integration site family member 4) has been demonstrated to play critical roles in a wide variety of biological processes, including embryonic development, cell proliferation, and differentiation in vertebrates, but its function in crustaceans is still not clear. In the present study, the full-length wnt4 cDNA sequence was cloned and characterized for the ridgetail white prawn Exopalaemon carinicauda. The expression patterns of the wnt4 mRNA in embryos and larvae at different stages were investigated. The tissue distribution showed that wnt4 was obviously expressed in eyestalk and hepatopancreas. During embryonic development, the wnt4 was highly expressed in all developmental stages except the zygote, two-cell stage, and late zoaea stage. The wnt4 mRNA was expressed in Z1-Z5 and post-larval stages. Taken together, the present study indicates that the wnt4 gene may be involved in the regulation of embryonic and larval development in the ridgetail white prawn.

scholarly journals Embryonic and larval development of guchibaim, Mastacembelus pancalus (Hamilton)

1970 ◽  
Vol 7 (1) ◽  
pp. 193-204 ◽  
Author(s):  
MM Rahman ◽  
MI Miah ◽  
MAH Taher ◽  
MM Hasan
Keyword(s):  
Embryonic Development ◽  
Larval Development ◽  
Digestive System ◽  
Average Length ◽  
Yolk Sac ◽  
Laboratory Conditions ◽  
Total Length ◽  
Embryonic And Larval Development ◽  
Early Gastrula ◽  
Total Average

The embryonic and larval development of local Guchibaim, Mastacembelus pancalus (Hamilton) was studied during May to October 2007. This study presents preliminary observations on the embryonic and larval development of Mastacembelus pancalus under laboratory conditions. The parents stock was collected from different places of Mymensingh district. The eggs were obtained through induction of spawning by use of hormones. At fertilization; the eggs were 0.50 mm in diameter. Samples were taken every 10 minutes interval till completion of morula and then every 1 hour interval up to hatching. After hatching, daily observations took place until the attainment of the fingerling stage. The eggs presented coloration varying from yellow to brownish-green. They were spherical, demersal and adhesive. The stages of embryonic development observed with cleavage, followed by blastula, morula, early gastrula, middle gastrula, late gastrula and until hatching of non-pigmented larvae which displayed total average length of 1.3 mm ± 0.22, 35 hours after fertilization. First cleavage was recorded within 1.05 hrs after fertilization and the embryonic rudiments of developing eggs appeared at 24.30 hrs at 27.0-31.0°C. The yolk sac was completely absorbed at 67 hrs during embryonic development on attainment of 5.50 mm total length. At the same time the digestive system became fully developed and the larvae searched for feeding. Keywords: Embryo; Larvae; Guchibaim; Mastacembelus pancalus DOI: 10.3329/jbau.v7i1.4984 J. Bangladesh Agril. Univ. 7(1): 193-204, 2009

scholarly journals EMBRYONIC AND EARLY LARVAL DEVELOPMENT OF WHITESPOTTED GREENLING HEXAGRAMMOS STELLERI (SCORPAENIFORMES: HEXAGRAMMIDAE) FROM THE NORTHERN OKHOTSK SEA

2019 ◽  
Vol 199 ◽  
pp. 141-151
Author(s):  
R. R. Yusupov ◽  
R. R. Yusupov
Keyword(s):  
Water Temperature ◽  
Larval Development ◽  
Morphological Development ◽  
Okhotsk Sea ◽  
Exogenous Feeding ◽  
Mean Diameter ◽  
Hexagrammos Stelleri ◽  
Early Larval Development

In vitro morphological development of whitespotted greenling Hexagrammos stelleri from the northern Okhotsk Sea is described in detail and illustrated from the eggs fertilization to the larvae transition to exogenous feeding. Mean diameter of the fertilized eggs is determined as 2.03 mm (1.80–2.30 mm). The embryos hatch in 30 days and 6 hours after fertilization of eggs under the water temperature of 7.1–12.4 оC (on average 11.5 оC). The hatched prelarvae have the size TL 7.73–9.20 mm (on average 8.49 ± 0.09 mm) and SL 7.48–8.80 (8.15 ± 0.08 mm).

scholarly journals Embryonic and larval development of Labeobarbus megastoma and Labeobarbus platydorsus(pisces: cyprinidae) in lake tana (Ethiopia)

2020 ◽  
Vol 9 (5) ◽  
pp. 191-201
Author(s):  
Belay Abdissa
Keyword(s):  
Larval Development ◽  
Early Ontogeny ◽  
Exogenous Feeding ◽  
Lake Tana ◽  
Yolk Absorption ◽  
Developmental Rates ◽  
The Mean ◽  
Newly Hatched Larvae ◽  
First Time ◽  
Embryonic And Larval Development

The information on the early ontogeny of the endemic Labeobarbus megastoma and Labeobarbus platydorsus fish species of Lake Tana are absent. In this paper we describe for the first time the full developmental sequence from egg to fingerling in controlled conditions. In addition, information on larval behavior, identification and developmental rates are provided. Embryonic development lasted 50:30h (26.3°C) and 61:38 (23.4°C) for the two species L. megastoma and L, platydorsus respectively and larval development to the morphology until the fry became very similar to the adult fish lasted 40 days (24.4°C). The mean total length of the newly hatched larvae of L. megastoma and L. platydorsus were 5.7±0.03 and 6.4±0.03mm respectively. The larvae hatched with closed mouth and anus, unpigmented eyes, large yolk and complete yolk absorption and exogenous feeding started on day 10 (8.9±0.07 and 10.5±0.12mm TL for L. megastoma and L. platydorsus respectively). The first posterior swim bladder aeration completed 5 days and 5 days and 6 h with 8.4±0.06 and 8.2±0.08mm TL for L. megastoma and L. platydorsus respectively and show full juvenile pigmentation and behaviour on the 41st day.

Embryonic and larval development of the tub gurnard Trigla lucerna (Pisces: Triglidae)

2001 ◽  
Vol 81 (2) ◽  
pp. 313-316 ◽  
Author(s):  
J. Dulčić ◽  
L. Grubišić ◽  
I. Katavić ◽  
N. Skakelja
Keyword(s):  
Embryonic Development ◽  
Larval Development ◽  
Yolk Sac ◽  
The Other ◽  
Pectoral Fin ◽  
Total Length ◽  
Identification Of Species ◽  
Newly Hatched Larvae ◽  
Embryonic And Larval Development ◽  
Early Larval Development

The embryonic and early larval development of the laboratory-reared tub gurnard, Trigla lucerna are described. The eggs ranged in diameter from 1·33 to 1·40 mm, with a mean of 1·36±0·236 mm, were pelagic and spherical with a homogeneous and unsegmented yolk. There was single oil globule in the eggs. Globule ranged in diameter from 0·25 to 0·29 mm (mean 0·28±0·012 mm). Embryonic development lasted 115 h 2 min at mean temperature 13·5 °C. Newly-hatched larvae were 3·09±0·014 mm in total length. Absorption of the yolk sac was complete after the sixth day, when larvae reached 4·85±0·015 mm in total length. The only character for identifying eggs among species could be diameter, since the values obtained are lower than those obtained for Eutrigla gurnardus and Aspitrigla cuculus, but larger than those for Trigloporus lastoviza. The length of newly hatched yolk-sac larvae of tub gurnard is significantly lower (t-test, P<0·05) than those of most of the other gurnard species. Characters likely to help in identification of species will probably prove to be the length, shape and pigmentation of the pectoral fin, and the degrees of development of spiny armature on the head.

scholarly journals Peculiarities of Hypophthalmichthys molitrix (Valenciennes, 1844) Embryonic Development Under Conditions of Artificial Reproduction in Uzbekistan

2020 ◽  
Vol 6 (5) ◽  
pp. 83-88
Author(s):  
A. Ashrapov ◽  
Kh. Yuldoshev ◽  
B. Kamilov
Keyword(s):  
Embryonic Development ◽  
Water Temperature ◽  
Silver Carp ◽  
Mixed Feeding ◽  
Artificial Reproduction ◽  
Hypophthalmichthys Molitrix ◽  
Exogenous Feeding ◽  
Local Conditions ◽  
Main Method ◽  
Stimulation Of

Embryonic development of Silver Carp (Hypophthalmichthys molitrix) was studied; the species was introduced from China to Uzbekistan in the early 1960s. More than 10 generation changes were taken place in local conditions. Artificial reproduction by using gonadotropic stimulation of ripening and eggs incubation is main method to provide reproduction of the species in the country. Embryonic development passed normally. A larvae hatching occurs after 32 hours after fertilization at water temperature 21–23 °C, transition to mixed feeding of larvae after 4 days, to exogenous feeding after 5 days. Embryonic development rate is some higher than in 1960–1980s in local conditions and higher than in the river Yangtze. Construction of water supply in hatchery provides more stable water temperature without noticeable changing in night.

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