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Eco-Biology and Fisheries of the Whelk, Babylonia Spirata

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Eco-Biology and Fisheries of the Whelk, Babylonia Spirata _\’ \q3 _ m»;*,,;/_\Q‘ \ '/// \ \ , <»\\ ‘ \, ECO-BIOLOGY AND FISHERIES oF:\“\7H I » BAB YLONIA SPIRA TA (LINNAEUS,A 1758) , I BAB YLONIA ZEYLANICA (BRUGUIERE, 1739) ALONG KERALA COAST, INDIA Thesis submitted to Cochin University of Science and Technology in partial fulfillment of the requirement for the degree of Doctor of Philosophy Under the faculty of Marine Sciences By ANJANA MOI-IAN (Reg. No: 2583) CENTRAL MARINE FISHERIES RESEARCH INSTITUTE Indian Council of Agricultural Research KOCHI 682 018 JUNE 2007 QRS Ty}, D C0 H I :34 I23 ®edi'catec[ to My Tarents. Certificate This is to certify that this thesis entitled “Eco-biology and fisheries of the whelk, Babylonia spirata (Linnaeus, 1758) and Babylonia zeylanica (Bruguiere, 1789) along Kerala coast, India” is an authentic record of research work carried out by Anjana Mohan (Reg.No. 2583) under my guidance and supervision in Central Marine Fisheries Research Institute, in partial fulfillment of the requirement for the Ph.D degree in Marine science of the Cochin University of Science and Technology and no part of this has previously formed the basis for the award of any degree in any University. Dr. V. ipa (Supervising guide) Sr. Scientist,\ Mariculture Division Central Marine Fisheries Research Institute. Date: 3?-95' LN?‘ Declaration I hereby declare that the thesis entitled “Eco-biology and fisheries of the whelk, Babylonia spirata (Linnaeus, 1758) and Babylonia zeylanica (Bruguiere, 1789) along Kerala coast, India” is an authentic record of research work carried out by me under the guidance and supervision of Dr. V. Kripa, Sr. Scientist, Mariculture Division, Central Marine Fisheries Research Institute, in partial fulfillment for the Ph.D degree in Marine science of the Cochin University of Science and Technology and no part thereof has been previously formed the basis for the award of any degree in any University. (ANJAN A MOHAN) Date: 2.7» 05- 07 Acknowledgement I am greatly indebted to Dr. V. Kripa (supervising guide), Sr. Scientist, Mariculture Division, Research Center of CMFRI, Calicut for her guidance, valuable suggestions, constant encouragement, criticism and support during the course of my investigation and documentation. I owe many thanks to Dr. Mohan Joseph Modayil, Director, CMFRI, Kochi for extending all the facilities for successful completion of this research work. I express my deep sense of gratitude to Dr. K. Sunilkumar Mohamed, HOD, Molluscan Division, CMFRI for his constant help, guidance, subjective criticism and encouragement in preparing the thesis. It is my pleasure to acknowledge Dr. K.K. Appukuttan, former HOD anui Principal Scientist, Molluscan Fisheries Division of CMFRI for helping me carry out my work and in the preparation of the manuscript. I acknowledge my deepest sense of gratitude to Dr. M. Srinath, HOD, FRAD, Dr. T.S. Velayudhan, Principal Scientist, Dr. P. Laxmilatha, Senior Scientist; Dr. Shoji Joseph, Senior Scientist; Dr. Somy Kuriakose, Scientist Sr. Scale; for their help during the course of my study. I am highly indebted to Dr. Paul Raj, Scientist­ in Charge, PGPM, CMFRI for the timely help in all matters concerned with my Ph. D programme. The help and support extended kqriflua PGPM staff':Ms gratefully acknowledged. I wish to express my sincere thanks to time OIC library and other staff members" for the help and cooperation extended. I am thankful to Dr. Sarala Devi, Scientist, Mrs. Jasmine, Dr. Jayaraj, Research scholars, NIO, Kochi for their help rendered to me during the tenure of work. I zmn grateful to [hm P. PL Radhakrishnan, <OIC, CMFRI RC, Calicut for providing facilities to prepare i the manuscript. I also thank other staff members of Calicut RC of CMFRI for their help. I thank Shri P. Radhakrsihan, Shri. Mathew Joseph, Shri. P.S. Alloycious, Smt. Jenny Sharma, Shri. M.N. Sathyan, Smt N. Ambika, Mrs. Sheela, Shri. Zainudeen, Shri. Jeevanraj staff of Molluscan Fisheries Division, CMFRI for their great help and constant encouragement in carrying out my work. My special thanks are due ix) Mr. Ramalinga, Dr. R. Gireesh, Mr. P. S. Sivaprasad, Dr. S. Balu, Mr. M. Vinod, Dr. K.P. Abdu Rahiman, Dr. Satish Sahayak, Dr. Anikumari, Mrs. Sreejaya, Mrs. Leena Ravi, Mrs. R. Jugnu, IMiss. ‘Neetha. Susan David, lflr. PL Hashinl and other Senior Research Fellows of CMFRI, Kochi for their timely help auui constant encouragements during the course of my study. I greatly acknowledge the financial assistance from tfluz AP Cess fund. of Indian Council of Agricultural Research in the form of Senior Research Fellowship under the project “Development of seafarming techniques for commercially important whelk, Babylonia spp.”. I thank Mr. Shaji, Mr. Marshal Mr. Lknz and all those who have helped me collecting the samples. Above all, I am greatly obliged to my parents and family for their kdessings and encouragement without which the completion of this work would only have been a dream. Anjana Mohan H Contents Acknowledgement 1-11 Chapter 1. Introduction l Chapter 2. Review of literature 2.1 Eco-biology of gastropods 8 2.2 Fishery 18 2.3 Utilization 23 2.4 By—catch 24 2.5 Management 26 Chapter 3. Materials and methods 3.1 Sampling 28 3.2 Analysis 30 Chapter 4. Results 4.1 Hydrology 40 4.2 Sediment characteristics 46 4.3 Whelk distribution and abundance 49 4.4 Associated Fauna 52 4.5 Relationship of whelk abundance with 75 abiotic and biotic factors 4.6 Reproductive biology 77 4.7 Food and feeding 87 4.8 Biometric relationships 88 4.9 Length frequency distribution 91 4.10 Mean length 95 4.11 Growth 97 4.12 Fishery 101 Chapter 5. Discussion ll-4 Chapter 6. Summary 145 References 149 Cfiapter 1 Introduction 1. Introduction Molluscs form one of the earliest recorded groups of living organisms. Their presence on planet earth since the Paleozoic era 540 million years ago has been proved beyond doubt. Abundance, size and diversity and their dual roles as predators and prey make molluscs an indispensable component of tropical marine ecosystems. With more than 80,000 species, the phylum Mollusca is second only to the phylum Arthropoda. Of these, only about 28 species of bivalves and 65 species of gastropods are of commercial importance either in shell trade or for edible purpose and 14 species of cephalopods are exploited commercially. Although only a few reliable comparative data exist, molluscs probably comprise 15-40% numerically of benthic macro invertebrates and are exceeded only by polychaetes and crustaceans in tropical lndo-West Pacific coastal marine environments (Longhurst and Pauly, 1987). Species of the class Gastropoda of phylum Mollusca with their omamental shell and succulent meat have been harvested since time immemorial. The production has increased considerably from 30,499 tomies in 1950 to l,2l,657 t in 2003 (FAO, 2003). The peak during the period 1950 to 2003 has been in 1996, when 1,4 l ,780 t were harvested from the natural beds. During the past 25 years the number of countries involved in gastropod fishing rose from 23 to 47. (Leiva and Castilla, 2002). The four major gastropod groups which contributed to world fisheries in 2003 were whelks (30.9%), stromboid conchs (19.5%), turbo snails (18.7%) and abalone (10.3%). The dominant species were Buccinum undatum (31,492 t), Strombus spp. (23,666 t), Turbo cornutus (22,721 t), Busycon spp. (6130 t), Haliotis rubra (5094 t) Concholepas cocholepas (2857 t) and Murex spp. (2337 t). The three main producers of gastropods are Europe (28.65%), North America (25.l3%) and Asia (23.23%). The entire quantity of B. undatum fished is from Europe. Leiva and Castilla (2002) reviewed the world gastropod fishery. They have stated that the gastropod fishery is mainly from three regions, viz, (l) the American continent, where the muricid commonly called “loco”, Concholepas concholepas is fished from Chile and Peru; strombid conch, Strombus spp., from the Caribbean and the abalone, Halioris spp., l from Califomia (2) the Asia and Oceania, with the well established abalone fishery, mainly in Australia and New Zealand, and the horned turban snail, Turbo truncatus, in Japan and Korea and (3) from Africa and Europe where, Haliotis midae is heavily fished from South Africa, and the common periwinkle, Littorina littorea, and the whelk Buccinum undatum from Europe. Globally six species of genus Babylonia are commercially important, viz, Babylonia areolata, B. japonica, B. formosaeformosae, B. formosae habei, B.spirata and B. zeylanica. These are very popular mainly in Southeast Asian countries. In several parts of the world due to high economic value and excessive capture many marine gastropods show, or have shown serious problems of overexploitation (Tegner, l989; Castilla, 1996; Ponce-Diaz et aI., 1998; Hobday et a1., 2001). In many cases this has led to the collapse or permanent closure of the fishery. The social and economic consequences of these collapses have promoted the development of new management perspectives centered on both biological and economical sustainability (Baker er al., 1996; Prince et al., 1998; Castilla, 1997a, 1999, 2000). One of the major gastropod fisheries which has collapsed due to overexploitation is the Chilean muricid fishery. Between 1979 and 1988, Chile was the most important marine gastropod extractor in the world, accounting for over 35% of the world gastropod landings (1980). However, after 1989, the main Chilean gastropod fishery, the muiicid gastropod Concholepas concholepas, declined most likely due to stock over-exploitation (Castilla, 1995, l 997b; Castilla et al., 1998). Another classic example of over-fishing is the Califomian multi-species abalone fishery. In the last 150 years five abalone species: Haliotis corrugata (pink abalone), H. fulgens (green abalone), H. rufescens (red abalone), H. sorenseni (white abalone), and H. cracherodii (black abalone), have been commercially extracted in Califomia.
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