Ecology of fouling bryozoans at Visakhapatnam harbour

  • K Satyanarayana Rao
  • P N Ganapati


Twelve species of bryozoans occur in the fouling communities at Visakhapatnam Harbour, of which the encrusting cheilostome-Electra bengalensis (Stoliczka) is by far the most common. The horizontal distribution of bryozoans at four selected stations in the harbour is recorded. Quantitative data on the seasonal abundance and settlingrates ofE. bengalensis and some of the prevailing hydrographical conditions, i.e. temperature, salinity and turbidity data, are given for one year (December 1966 to November 1967). The observations indicate thatE. bengalensts is a continuous breeder and also a fast growing species. The influence of temperature and salinity on its breeding and abundance is discussed.

While only 12 species of bryozoans occur in the harbour, the number of species occurring in the nearby foreshore localities at Visakhapatnam ranges from 20 to 34. The effect of some factors (pollution, salinity, silting larval type and fouling) which may influence the distribution of bryozoans is discussed.


Fouling bryozoans ecology E. bengalensis 


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  1. Allen P B and Wood B J P 1950 Investigations in underwater fouling;Aust, J. Mar. Freshwater Res. 1 92–105CrossRefGoogle Scholar
  2. Antony Raja B T 1959 Studies on the distribution and succession of sedentary organisms of the Madras harbour;J. Mar. Bioi. Assoc. (India) 1 180–197Google Scholar
  3. Banta W C 1969aWatersipora arcuata, a new species in theSubovoidea-cucullata-nigra complex (Bryozoa, Cheilostomata);Bull. South Calif. Acad. Sci. 68 96–102Google Scholar
  4. Banta W C 1969b The recent introduction ofWatersipora arcuata Banta (Bryozoa, Cheilostomata) as a fouling pest in Southern California;Bull. South Calif. Acad. Sci. 68 248–251Google Scholar
  5. Becker G 1958FAO Report No 795 Project Ind/FAO: 1–112Google Scholar
  6. Carrada G C Sacchi C F and Rigillo M T 1965 Ricerche sulla Valenza ecologica dei briozoi salmastri, 1. Significato delle variazioni ritmiche dei fattori ambientali;Estrato del Bollettino di pesca, Piscicolturae eidrobiologia. Ann. 4120 153–208Google Scholar
  7. Cook P L 1968 Bryozoa (Polyzoa) from the coasts of Tropical West Africa;Atl. Rep. 10 115–262Google Scholar
  8. Corlett J 1948 Rates of settlement and growth of the ‘pile fauna’ of the Mersey Estuary;Proc, Liverpool Bioi. Soc. 56 2–28Google Scholar
  9. Daniel A 1954 The seasonal variations and the succession of the fouling communities in the Madras harbour waters;J. Madras Univ,24 189–212Google Scholar
  10. Dobson J G 1946 The Control of Fouling Organisms in Fresh and Salt-Water Circuits;Trans. Am. Soc. Mech. Eng. 68 247–265Google Scholar
  11. Ganapati P N, Lakshmana Rao M V and Nagabhushanam R 1958 Biology offouling in the Visakhapatnam harbour;Andhra Univ, Mem. Oceanogr, Ser. 622 193–209Google Scholar
  12. Ganapati P N and Rao T S S 1959 Some remarks on the Bay of Bengal;J. Mar. Bioi. Assoc. India 1 224–227Google Scholar
  13. Ganapati P N and Satyanarayana Rao K 1968 Fouling Bryozoans in Visakhapatnam harbour;Curro Sci. 37 81–83Google Scholar
  14. Ganapati P N and Raman A V 1973 Pollution in Visakhapatnam harbour;Curro Sci. 42 490–492Google Scholar
  15. Gopalakrishnan V and Kelkar V V 1958 A note on very heavy fouling of copper sheathed hulls of naval craft at Bombay;J. Bombay Nat. Hist. Soc. 55 588–590Google Scholar
  16. Haderlie B C 1969 Marine fouling and boring organisms in Monterey harbour 2. Second Year of Investigation;Veliger 12 182–192Google Scholar
  17. Iyengar R S, Gopalakrishnan V and Kelkar V V 1957 Studies on Marine fouling organisms in Bombay harbour;Def. Sci. J. 7 123–139Google Scholar
  18. Karande A A 1968 Studies on marine fouling and boring organisms in Bombay harbour;Def. Res. Dev. Org. Rep. India pp 1–20Google Scholar
  19. Maturo F J S Jr 1959 Seasonal distribution and settling rates of estuarine Bryozoa;Ecology 40 116–127CrossRefGoogle Scholar
  20. Maturo F J S Jr 1968 The distributional pattern of the Bryozoa of the East coast of the United States exclusive of New England;Atti. Soc. Ital. Sci. Nat. 108 261–284Google Scholar
  21. Mawatari S 1953 OnElectra angulata Levinsen, one of the fouling bryozoans in Japan;Misc. Rep. Res. Inst, Nat. Resour, Tokyo 32 5–10Google Scholar
  22. Menon N R 1971 Ecology of fouling bryozoans in Cochin Waters;Mar. Biol. 8 280–307CrossRefGoogle Scholar
  23. Nair N B 1961 Some observations on the distribution of Bryozoans in the Fjords of Western Norway;Sarsia 3 37–45Google Scholar
  24. Nair N B 1962 Ecology of marine fouling and wood-boring organisms of Western Norway;Sarsia 8 1–88Google Scholar
  25. Nair N U 1967 The settlement and growth of major fouling organisms in Cochin harbour;Hydrobtolosia 30 503–512Google Scholar
  26. Orton J H 1920 Sea-temperature, breeding and distribution in marine animals;J. Mar. Bioi. Assoc. UK 12 339–366CrossRefGoogle Scholar
  27. Paul M D 1942 Studies on the growth and breeding of eertain sedentary organisms in the Madras harbour;Proc, Indian Acad, Sci. B15 1–42Google Scholar
  28. Powell N A 1970Schizoporella unicornis-An alien bryozoan introduced into the Strait of Georgia;J. Fish. Res. Bd. Can. 27 1847–1853Google Scholar
  29. Powell N A, Sayee C S and Tufts D F 1970 Hyperplasia in an estuarine bryozoan attributable to coaltar derivatives;J. Fish. Res. Bd. Can. 27 2095–2096Google Scholar
  30. Powell N A 1971 The marine bryozoa near the Panama Canal;Bull. Mar. Sci. 21 766–778Google Scholar
  31. Purushotham A and Satyanarayana Rao K 1971 The first progress report of the Committee of the protection of Timber against marine organisms attack in the Indian Coastal waters for the period 1953–70;J. Timb. Dev, Assoc. India 17 1–139Google Scholar
  32. Rao B S 1964 Studies on marine fouling organisms tolerent to low salinity and copper at Bombay harbour;IndianJ. Tech. 2 142–146Google Scholar
  33. Robertson A 1921 Report on a collection of Bryozoa from the Bay of Bengal and other eastern seas;Rec. Indian Mus. 22 33–65Google Scholar
  34. Ryland J S 1970Bryozoans (London: Hutchinson Univ. Lib.) pp 1–175Google Scholar
  35. Ryland J S 1971 Bryozoa (Polyzoa) and marine fouling. inMarine borers, fungi and fouling organisms of woodeds G Jones and S K Eltringham.Orgn. Econ. Co-op. Dev, (Proc. OECD Workshop Portsmouth 1968) 137–154Google Scholar
  36. Santhakumaran L N and Pillai S R M 1970 Marine foulers in Bombay waters: Barnacles and Polyzoans, Annual Day Souvenir, Central Inst, of Fisheries Education 32–34Google Scholar
  37. Satyanarayana Rao K 1975 The systematics and some aspects of the ecology of littoral bryozoa on the north-east coast of India, Ph.D. thesis, Andhra UniversityGoogle Scholar
  38. Semper K 1883 Animal Life;Inter. Sci. Ser, London 1–428Google Scholar
  39. Skerman T M 1960 The recent establishment of the polyzoan,Watersipora cucullata (Busk) in Auckland Harbour, New ZealandN. Z. J. Sci. 3 615–619Google Scholar
  40. Stoliczka F 1869 On the anatomy ofSagartia scilleriana andMembranipora bengalensis; J. Asiat. Soc. Bengal38 228–63Google Scholar
  41. Wisely B 1959 Factors influencing the settling of the principal marine fouling organisms in Sydney Harbour;Aust, J. Mar. Freshwater Res. 10 30–44CrossRefGoogle Scholar
  42. Woods Hole Oceanographic Institution 1952 Marine fouling and its prevention annapolis United States Naval Institute pp 1–388Google Scholar

Copyright information

© Indian Academy of Sciences 1978

Authors and Affiliations

  • K Satyanarayana Rao
    • 1
  • P N Ganapati
    • 1
  1. 1.Department of ZoologyAndhra UniversityWaltair

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