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

केंद्रीय समुद्री मात्स्यिकी अनुसंधान संस्थान का कारवार अनुसंधान केंद्र

केंद्रीय समुद्री मात्स्यिकी अनुसंधान संस्थान का कारवार अनुसंधान केंद्

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 4×2 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 (7–8 days) as compared to 29 °C (8–10 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 temperature–salinity combination for larval survival and metamorphosis of P. merguiensis is 33 °C and 35 ppt. A salinity range of 30–35 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