Multiple limb autotomy can trigger either ovarian growth or somatic growth in the freshwater crab, Paratelphusa hydrodromous (herbst)

1984 ◽  
Vol 56 (3) ◽  
pp. 433-443 ◽  
Author(s):  
K.N.P. Kurup ◽  
Rita G. Adiyodi
Keyword(s):  
Somatic Growth ◽  
Freshwater Crab ◽  
Ovarian Growth

scholarly journals Impact of methoprene on oogenesis of the freshwater crab Travancoriana schirnerae Bott, 1969 (Decapoda: Gecarcinucidae)

2017 ◽  
Vol 4 (7) ◽  
pp. 165-179 ◽  
Author(s):  
Latha Nadkandi Padmanabhan ◽  
Sudha Devi Arath Raghavan ◽  
Aswani Ayanath
Keyword(s):  
Oocyte Diameter ◽  
Freshwater Crab ◽  
Histopathological Changes ◽  
Significant Drop ◽  
Ovarian Growth ◽  
Germinal Zone ◽  
General Metabolism ◽  
Sublethal Doses ◽  
The Impact ◽  
Platelet Formation

The current study investigated the impact of methoprene during different phases of oogenesis in the freshwater crab Travancoriana schirnerae Bott, 1969 (Decapoda: Gecarcinucidae), a non-target organism abundant in the wetlands of Wayanad, Kerala, India. Sublethal doses of methoprene impaired ovarian growth as evidenced by reduction in gonadosomatic values, fall in mean oocyte diameter and histopathological changes in all the phases of oogenesis. A significant drop in the proportion of mature oocytes in the experimental crabs were noticed, i.e. methoprene treatment delayed the growth of avitellogenic oocytes to previtellogenic and previtellogenic to early, middle or late vitellogenic stages. Reduction in proliferation of oogonia in the germinal zone and ruptured oolemma in chromatin nucleolus and perinuclear stage oocytes was persistent. Histopathological changes in the primary vitellogenic oocytes include karyoplasmic clumping, perinuclear space atresia, shrinkage and vacuolation of ooplasm, reduction in size of yolk globules and vacuolated globules and degeneration of follicle epithelium. Methoprene negatively affected yolk platelet formation as evidenced by the irregularly fused and distorted yolk platelets of late vitellogenic oocytes. The observed cellular deformities possibly suggest the direct effects of methoprene on the oocytes through general metabolism and growth or through hormones controlling ovarian growth.

scholarly journals Effect of ecdysteroids on oogenesis in the freshwater crab Travancoriana schirnerae Bott, 1969 (Crustacea: Gecarcinucidae)

2019 ◽  
Vol 6 (12) ◽  
pp. 87-101
Author(s):  
Sudha Devi Arath Raghavan ◽  
Aswani Ayanath
Keyword(s):  
Reproductive Performance ◽  
Gonadosomatic Index ◽  
Poor People ◽  
Oocyte Diameter ◽  
Freshwater Crab ◽  
Histological Features ◽  
Protein Substitute ◽  
Concurrent Control ◽  
Ovarian Growth ◽  
The Mean

This study evaluated the reproductive performance of female Travancoriana schirnerae Bott, 1969 (Crustacea: Gecarcinucidae) administered with 20-OH ecdysone during different phases of the oogenic cycle. The effect of administration was evaluated by comparing the mean gonadosomatic index, oocyte diameter, oocyte proportion values and histological features of the control and concurrent control ovaries with those of the experimentals. The results clearly indicated that 20-OH ecdysone can stimulate ovarian growth and maturation in all phases of the oogenic cycle, though it caused statistically significant effects only during the early and middle vitellogenic phases, evidenced from the accelerated gonadosomatic index, oocyte diameter and oocyte proportion values, occurrence of vitellogenic oocytes in avitellogenic and previtellogenic ovaries, increased degree of yolk deposition and proliferation of gonia in the experimental ovaries compared to the controls. The outcome of this study is quite promising in the aquaculture practice of this locally abundant edible freshwater crab which forms a cheap protein substitute for the malnourished tribes/poor people of Wayanad.

Review of Somatic Growth of the Child.

1967 ◽  
Vol 12 (7) ◽  
pp. 382-383
Author(s):  
HOWARD V. MEREDITH
Keyword(s):  
Somatic Growth

HISTOMORPHOLOGICAL CHANGES IN THE BRAIN IN RELATION TO OVARIAN CYCLE OF FRESHWATER CRAB, BARYTELPHUSA CUNICULARIS

2017 ◽  
Vol 23 (1) ◽  
Author(s):  
C.A. JAWALE
Keyword(s):  
Staining Intensity ◽  
Neurosecretory Cells ◽  
Ovarian Cycle ◽  
Secretory Product ◽  
Freshwater Crab ◽  
Intensity Index ◽  
Cytoplasmic Material ◽  
Histomorphological Changes ◽  
Cyclic Changes ◽  
The Brain

Ovarian maturation by neurosecretory cells in the brain of freshwater crab, Barytelphusa cunicularis have been examined. The histological scrutiny of the brain of Barytelphusa cunicularis related with three types (A, B and C) of neurosecretory cells, which are classified on the basis of size, shape and tinctorial characters. All these types of cells marked annual cyclic changes of cytoplasmic material in association with ovarian cycle. The activity of these cells has been correlated with the ovarian cycle. They are distinguishable by their size, nature locations, shape, nucleus position, cell measure and the secretory product in the cytoplasm. The result indicates that the neurosecretory A, B and C cells of the brain seen involved in the process of mating ovulation. The neurosecretory materials staining intensity index of these cells is described.

Sign in / Sign up

Export Citation Format

Share Document