Mackerel fishery of India is constituted

mainly by RastrelJiger kanagurta. Young

stages of it are reported to be caught only

occasionaliy from the east and west coast of

our country ,. Recently larval and post larval

stages of the mackerel .have, however, been

identified in the plankton 2-3. The spawning

ground of the species is not yet clearly known

Bhat, G S

Pillai, S Krishna

CMFRI Digital Repository

TABlE 1 : NOa content in the water of some of the dug wells S. No. 1. 2. 3 . 4' 5. 6. 7. B. 9. 10. 11. 12. 13. 14. 15. 16. ,,' 14' Well No, (See Varanasi Map) 1 2 6 7 B 9 12 16 21 27 29 34 41 56 65 73 B2 56~ " . __ Location Bhadaini Maidagin Telianala Rajgha' Bari Bazar City Railway Station Maldahiya Rathyatra Naria Nadeshwar Gilat Bazar Nai Basti Shivdaspur Assi (On road) lanka (P.S.) Chaukaghat N03 in ppm 150 150 566 192 190 92 196 130 lpO 102 206 17' 142 106 132 ·96 Fig . 1 . . Location and number of sampled wells. of its leakage to aquifer beds cannot be ruled out. Vertical percolativn of this water through the kankar and sandstone pebbles bearing clay VOL. 56, NO.1 0 "-...:/ bed overlying the sand bed which constitutes the rich aquifer of Varanasi City is not improb-able. Nitrogenous fertilizers used for g00d yield of horticultural crop can also be con-sidered as a potential source of nitrate pollution. At many places even the excreta of pigeons, too, may be responsible for increas~ ing the NO 3 content of water. [nt"nsive systematic study on physico-chemical properties of the 'well-water together with the soil aspects of many parts of Yaranasi region are underway. These are necessary to find ways to prevent hazards. Yaluable guidance by Prof. S. K. Agrawal, and the financial assistance provided by the Department of Forestry, Government · of India, are gratefully acknowledged. Thanks are due to Dr. H. P. Agrawal of Institute of Agricultural Sciences, B. H. U. for · helpful suggestions. Sincere appreciation is due to M IS. A. Sam ad and A. Kumar, JRFs in the Department of Geology, B. H. U. for their assistance in chemical analyses. Department of Geology, Banflras Hindu University. Va ran esi-221 005. Re 'eived : 5 March, 1990. G. C. CHOWDHARY A note on tbe record of juveniles of Rastrelliger kallagurta (cuvier) in the distant waters off Ratnagiri Mackerel fishery of India is constituted mainly by RastrelJiger kanagurta. Young stages of it are reported to be caught only occasionaliy from the east and west coast of our country ,. Recently larval and post larval stages of the mackerel .have, however, been 423 identified in the plankton ' - '. The ~pawning ground of the species is not yet clearly known. Small mackerel of 62-122 mm size were reported to occur off Ratnagiri in September, 1959 by George and Annigeri'. Narasimham (Personal communication) also reports occurrence of mackerel of 108-151 mm sizes there in October, 1961 in Rampan catches. Young mackerel of 10-130 mm sizes were reported from March to May in the areas along 10" to 30' N by PFP'. It also mentions about the occurrence of three mackerel larvae (3.7,9.0 and 10.0 mm size) in the plankton samples collected In August, 1972 off Ratnagiri. young mackerel were reported to occur in the shelf area extending from Tuticorin on the east coast to Ratnagiri on the We,t coast by PFP' during March-August of 1972, 1973 and 1974. Thirty one juvenile mackerel of size 73-87 and weight 3-5 g were collected from the trawl catches of M. T. 'Mats),a Vigyani' operated at 30-35 m depth in Lat. 17' -20'N and Long. 72' -IO'E on 4-11-77 at about 70 nautical miles iu the distant waters off Ratn.giri. The dominant size contributing to 49% of it was 80 mm group. The available record of young mackerel from Ratnagiri area indicates that they occur in shelf waters in March-August, PFP'. September, George and Annigeri' and October (Narasimharo, Per. Com.). Presently it is recorded north of Ratnagiri in distant waters in November. The spawning of mackerel is said to extend up to November by Noble'. 4 24 Peter' has reported the occurrence of mackerel larvae from deeper waters. Spawners also recorded in distant waters off Bombay· Juveniles also now reported in distant waters off Ratnagiri. The stomach contents of 31 specimens consisted of mainly Coscinodiscus spp., copepods and young ones of Acetes indicus. The authors are grateful to Shri K, V. Narayana Rao, Dr. A. Noble, for kindly going thr,?ugh the manuscript and for their sugges-tions. I. C. A. R., S. KRISHNA PILLAI G. SUBRAMONIA BHAT' Central Marine Fisheries Research Institute, Mandapam camp-623520. Received: 5 February, 1990. *Central Marine Fisheries Research Institute, Mangalore-575001. lK. V. Rao. Pro. Symposium on Scombroid fishes, Muine biological Association of India, Part I, 1962. p. 469-482. 2E. G. Silas, Indian J . Fish. 21. 233·253, 1974. :lpF? UNDP /FAO Pelagic Fishery Project Progress Report No.7, Fish eggs and larvae studies, 1974. 4P. C. George and G. G. Annigeri, Curro Sci., 29. 319-320, 1960. 5PFP. UNDP/ FAO PelagiC Fishery Project Progress Report No.6, Survey Results, 1f174. ~PFP, UNDP/ FAO Pelagic Fishery Project Progress Report No. 10, young fish studies, 1975. 7A, Noble, J. mar. bioI. Ass. India, 16, 826-829, 1974. RK . J. Peter, Nat. Insf. Sci. India, Part II, 38, 771a 777, 1969. 'S. Krishna Pillai, Indian J . Fish, 26, 237-238, 1979. - . SCIENCE AND CULTURE, OCTOBER, 1~91 

A note on tbe record of juveniles of Rastrelliger

kanagurta (cuvier) in the distant waters off

Ratnagiri

Mackerel fishery of India is constituted mainly by Rastrelliger kanagurta. Young slages of it are reported to be caught only occasionally from the easl and west coast of our countr

TABLE 1 : N03 content in the water of some of the dug wells S. No. Well No. Location NOs in (See Varanasi Map) ppm 1. 1 Shadaini 150 2. 2 Maidagin 150 3 . 6 Telianala 568 4' 7 Rajghat 192 5. 8 Bari Bazar 190 6. 9 City Railway Station 92 7. 12 Maldahiya 198 8. 16 Rathyatra 130 9. 21 Naris 160 10. 27 Nadeshwar 102 11. 29 Gilat Bazar 206 12. 34 Nai Bast; 174 13. 41 Shivdaspur 142 14. 56 Assj (On road) 106 15. 65 Lanka (P.S.) 132 16. 73 Chaukaghal 98 .,;: .. ' &3· 0' .f I~ro ,,/ VARANASI CITY r , ,. y 20 4011.101 I I I . I I N ----- I ( - ___ I 'L~ "- " , •\ ,~ \ '. ..... - .... '" I v '7~ ~ ~~ ) 17 • .7 "'" ell •• e., , ...... ,. ,'2',--41 I " ~ . 8"OJ_ I • !r,~ir ) I '. 4"~--' I " . I "~'~ _A l__ ...... 0 Romf'lQ9Qr ,,' • SAMPLED WElCS ~ . \~~" 2< '4' a'lo' A' o O;~ " '" Fig. 1. Location and number of sampled wells . of its leakage to aquifer beds cannot be ruled out. Vertical percol'ti"n of this water through the kankar and sandstone pebbles bearing clay VOL. 66. NO. 1 0 bed overlying the sand bed which constitutes the rich aquifer of Varanasi City is not improb-able. Nitrogenous fertilizers used for good yield of horticultural crop can also be con-sidered as a potential source of nitrate pollution. At many places even the excreta of pigeons, too, may be responsible for increas~ ing the N0 3 content of water. Intensive systematic study on physico-chemical properties of the well-water together with the soil aspects of many parts of Varanasi region 8re underway. These are necessary to find ways to prevent hazards. Valuable guidance by Prof. S. K. Agrawal, and the financial assislance provided by the Department of Forestry, Government of India, are gratefully acknowledged. Thanks are due to Dr. H. P. Agrawal of Institute of Agricultural Sciences, B. H. U. for helpful suggestions. Sincere appreciation is due to M IS. A. Samad and A. Kumar, JRFs in the Department of Geology, B. H. U. for their assistance in chemical analyses. Department of Geology. Baneras Hindu University, Varan?si-221005. Re eived : 5 March, 1990. G. C. CHOWDHAAY A note on the record of juveniles of Rastrelliger kanagurta (cuvier) in the distant waters off Ratnagiri Mackerel fishery of India is constituted mainly by Rastrelliger kanagurta. Young slages of it are reported to be caught only occasionally from the easl and west coast of our country'. Recently larval and post larval stages of the mackerel have, however, been 423 identified in the plankton ' -'. The spawning ground of the species is not yet clearly known. Small mackerel of 62-122 mm size were reported to occur off Ratnagiri in September, 1959 by George and Annigeri'. Narasimham (Personal communication) also reports occurrence of mackerel of 108-151 mm sizes there in October, 1961 in Rampan catches. Young mackerel of 10-130 mm sizes were reported from March to May in the areas along 10· to 30· N by PFP'. It also mentions about the occurrence of three mackerel larvae (3.7, 9.0 and 10.0 mm size) in the plankton samples collected in August, 1972 off Ratn.giri. y oung mackerel were reported to occur in the shelf area extending from Tuticorin on the east coast to Ratnagiri on the West coast by PFP ' during March-August of 1972, 1973 and 1974. Thirty one juvenile mackerel of size 73-87 and weight 3-5 g were collected from the trawl catches of M. T. 'Matsra Vigyani' operated at 30-35 m depth in Lat. 17· -20·N and Long. 72' -10'8 on 4-11-77 at about 70 nautical miles in the distant waters off Ratnagiri. The dominant size contributing to 49% of it was 80 mm group. The available record of young mackerel from Ratnagiri area indicates that they occur in shelf waters in March-August, PFP' . September, George and Annigeri I and October (Narasimham, Per. Com.). Presently it is recorded north of Ratnagiri in distant waters in November. The spawning of mackerel is said to extend up to November by Noble 7 • 424 Peter ' has reported the occurrence of mackerel larvae from deeper waters. Spawners also recorded in distant waters off Bombay' Juveniles also now reported in distant waters off Ratnagiri. The stomach contents of 31 specimens consisted of mainly Coscinodiscus spp., copepods and young ones of Ace/es indicu •. The authors are grateful to Shri K. V. Narayana Rao, Dr. A. Noble, for kindly going through the manuscript and for their sugges-tions. I.C. A. A., S. KAISHNA PILLAI G. SUBRAMONIA BHAP Central Marine Fisheries Research Institute, Mandapam camp--623520. Received : 5 February. 1990. ·Central Marine Fisheries Research Institute, Mangalore-575001. lK. V. Rao, Pro. Symposium on Scombroid fishc--:: Mc..rine biological AssOCiation of India, Part I, 1962. p. 469-482. ' E. G. Silas, Indian J . Fish. 21. 233-253. 1974. ·PFP. UNDP/ FAO Pelagic Fishery Project Progress Reporl No . 7, Fish eggs and larvae studies. 1974. 'P. C. George and G. G. Annigeri. CUff. Sci., 29, 319-320, 1960. ' PFP, UNDP/FAO Pelagic Fishery Project Progress Report No.6. Survey Results, 1!?74. ' PFP, UNDP/FAO Pelagic Fishery Project Progress Report No. 10, young fish studies. 1975. 7A. Noble. J . mar. bioI. Ass. India, 1&, 826· 829, 1974. IK. J. Peter, Nat. Inst. Sci. India, Part II, 38, 771· 777. 1969. IS. Kr ishna Pilla i, Indian J. Fish, 26, 237·238. 1979. SCIENCE AND CULTUAE, OCTOBEA, 1S90 

A note on the record of juveniles of Rastrelliger kanagurta (Cuvier) in the distant waters off Ratnagiri

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A note on tbe record of juveniles of Rastrelliger kanagurta (cuvier) in the distant waters off Ratnagiri

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