959 research outputs found
Larval development of the Indian spider crab Elamenopsis demeloi (Kemp) (Brachyura, Hymenosomatidae) in the laboratory
Complete larval development of the spider crab Eiamenopsis demeloi
(Kemp) was studied from larvae hatched and reared from an ovigerous crab
in the laboratory. At Z6-Z8┬░C temperature and 17-20 ppt salinity, three zoeel
stages were observed, followed by a first stage crab. A megalopa stage
was not present. Morphological features of these larvae are compared with
the other species of the family and the important characters that differ
from those of other zoeae are: Zaeee with very long mid-dorsal and rostral
spines and coxal endite of 2nd maxilla with 2 setas
рдХреЗрдВрджреНрд░реАрдп рд╕рдореБрджреНрд░реА рдорд╛рддреНрд╕реНрдпрд┐рдХреА рдЕрдиреБрд╕рдВрдзрд╛рди рд╕рдВрд╕реНрдерд╛рди рдХрд╛ рдХрд╛рд░рд╡рд╛рд░ рдЕрдиреБрд╕рдВрдзрд╛рди рдХреЗрдВрджреНрд░
рдХреЗрдВрджреНрд░реАрдп рд╕рдореБрджреНрд░реА рдорд╛рддреНрд╕реНрдпрд┐рдХреА рдЕрдиреБрд╕рдВрдзрд╛рди рд╕рдВрд╕реНрдерд╛рди рдХрд╛ рдХрд╛рд░рд╡рд╛рд░ рдЕрдиреБрд╕рдВрдзрд╛рди рдХреЗрдВрджреН
Stranding of a baleen whale
The decaying whale got stranded on the
sandy beach of Harkantrawada, Keni on the early
morning of 29th September 1996
Larval development of Ghost Crab Ocypode ceratophthalma (Pallas) under laboratory conditions
In the semi-terrestrial crab family Ocypodidae, the ghost crab Ocypade cerataphtha/ma (Pallas) represents
the sandy shore ecosystem. Of the eleven species of the genus Ocypade recorded from Indo-West Pacific
region (Serene, 1968), the ghost crab O.cerataphtha/ma was reared under laboratory conditions at Karwar.
The larvae passed through 5 zoeal stages before reaching a megalopa stage. The temperature and salinity of
the water during the experiment ranged from 23-26┬░C and 30-33 ppt. respectively. The complete metamorphosis
took nearly 40 days before reaching first crab stage. Larval descriptions are given in the text. The larvae have
a characteristic globose shape. Based on the presence of knobs on the abdominal segments, zoeae of the
genus Ocypode can be grouped into two groups: one group having knobs on first and second abdominal
segments and other group devoid of these knobs. In general, the megalopae of different species of Ocypodiae
resemble each other in their gross morphology. Globosely shape, posterio-Iateral depressions for reception of
fifth pair of walking legs, and lateral depressions where other ambulatory legs fit are common characters in
these species
Larval Development of the Indian Grapsid Crab, Metopograpsus latifrons H. Milne Edwards in vitro
Complete larval history of M.latifrons was studied in larvae spawned and reared in the laboratory. At 23_28cC temperature
and salinity 27-3Wooo 5 zoeal stages were observed followed by a megalopa stage. Morphological features of these larvae were
compared with those of M. messor. Important characters of zoeal stages and megalopa were discussed
Optimal salinity and temperature for early developmental stages of Penaeus merguiensis De Man
The combined effects of temperature and salinity on the hatching success, survival and development of the larval stages of Penaeus merguiensis were investigated in a 4├Ч2 factorial designed experiment employing two temperatures (29┬▒1 and 33┬▒0.5 ┬░C) and four salinities (25, 30, 35 and 40 ppt). Best percentage of hatch was obtained at 33 ┬░C and 35 ppt (87%) followed by 29 ┬░C and 35 ppt (82%). Similarly during naupliar stages, high survival rate was obtained at 33 ┬░C and 35 ppt (89%). Metamorphosis cycle during the protozoeal stages (protozoea 1 to postlarva 1) was extended and survival rate decreased at 25 ppt. Development to PL1 was faster at 33 ┬░C (7тАУ8 days) as compared to 29 ┬░C (8тАУ10 days) regardless of the salinity levels. Maximum survival during the protozoeal stages was at 35 ppt followed by 48% at 33 ┬░C and 45% at 29 ┬░C. Results showed that salinity exerted a greater influence than temperature on the survival and development of larvae. Based on the results, the best temperatureтАУsalinity combination for larval survival and metamorphosis of P. merguiensis is 33 ┬░C and 35 ppt. A salinity range of 30тАУ35 ppt is ideal for larval development
Banana shrimp: low cost technology for broodstock development
Global aquaculture production
more than doubled in weight and value
between 1986 and 1996, and it currently
accounts for over one quarter of aquatic
production consumed by humans
Unusual fishery of Parapenaeopsis acclivirostris in Tadri area (Karwar)
The occurrence of Oratosquilla nepa and Acetes johni, only for a few days before the beginning of the night fishing for prawns, serves as an indicator of the commencement of the intensive prawn fishery in the Tadri area of Karwar. The Acetes johni forms favourite food item of some fishes, which is related to the appearance of Lepturacanthus savala at Tadri. trawlers. Once P. acclivirostris which is called as young 'Karikadi' landed from 18-20 fathoms depth amounting to as high as 350 kg/boat. The observations provide a clue to the appearance of prawns from south to north at the beginning of the prawn fishery season in the Tadri-Karwar area during November over the years. This may help the fishermen to plan their fishing activities accordingly
Metamorphosis of the Hermit crab Diogenes diogenes(Herbst)(Decapoda, Anomura) in the Laboratory
Berried female was obtained from trawlers
operating in the ' Karwar bay, west coast of India.
The depths sampled by the otter trawl dunng tIlls
tow varied from 10 to 15 fm. The specimen was
maintained alive in aquaria with filtered sea water
until the larvae were release
Larval Development of the Xanthid Crab, Ozius rugulosus rugulosus Stimpson (Decapoda, Brachyura) under Laboratory Conditions
The present paper deals with the complete life
history, comprising 4 zoeal and a megalopa stages
as observed in the laboratory, of O. rugulosus
rugulosus Stimpson one of the two species recorded
from the Indian region
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