Coastal marine fish
biodiversity along the western coast of India
Robert D. Sluka
Chiltern Gateway Project, A
Rocha UK, 18-19 Avenue Rd, Southall, Middlesex UB1
3BL, United Kingdom
bob.sluka@arocha.org
doi:http://dx.doi.org/10.11609/JoTT.o3187.118 | ZooBank: urn:lsid:zoobank.org:pub:220D68BF-667B-4CF6-860D-010C7A76B047
Editor: J.
Jerald Wilson, King Abdulaziz University, Jeddah, Saudi Arabia. Date
of publication: 26 January 2013 (online & print)
Manuscript details: Ms #
o3187 | Received 30 April 2012 | Final received 05 October 2012 | Finally
accepted 18 November 2012
Citation: Sluka R.D.
(2013). Coastal marine fish biodiversity along the western
coast of India. Journal of Threatened Taxa 5(1):
3574––3579; doi:10.11609/JoTT.o3187.118
Copyright: © Sluka 2013. Creative Commons Attribution
3.0 Unported License. JoTTallows unrestricted use of this article in any medium, reproduction and
distribution by providing adequate credit to the authors and the source of
publication.
Funding: This
study was funded by the Committee for Research and Exploration,
National Geographic Society (Grant 7094-01).
Competing Interest: None.
Acknowledgements: We
thank S. Thomas, F.G. Nazareth and V. Charloo for
diving assistance. V. Charloo and K. Gregory of
Barracuda Diving Services, Goa provided dive support at cost at Murdeshwar and Panaji. G. Anita
Mary provided assistance in the field. R. Kuiterassisted with identifying several species. The author thanks M. Aneel Kumar and Sini Sony, GIS
Experts, RTS, Oman for producing the map.
For
figures, images, tables -- click here
The
commercial fish fauna of India has been studied extensively (James et al. 1994,
1996). However, little is known
about noncommercial fishes (Kuthalingam et al. 1973,
1979; Sreenivasan & Lazarus 1973; James et al.
1988; Murty 2002). Underwater visual censuses have been
reported from Lakshadweep (Anand & Pillai 2002, 2005), the Andaman and Nicobar Islands (Madhu & Madhu 2007; Rajaram & Nedumaran 2009) and
from islands off the central western coast states of Goa and Karnataka (Sluka & Lazarus 2004, 2005, 2006, 2009, 2010; Zacharia et al. 2008; Thomas et al. 2011). The present study reports on marine fish
biodiversity studies completed on the south-west coast
of India. This represents the first
report of southwestern Indian fish biodiversity made using underwater visual
observations.. This report documents 184 species from
this coast, 12 of which appear to be new records for India.
Materials and Methods
Data
were collected by one observer (RDS) on SCUBA by recording observations on
underwater paper and comparing to standard fish identification books (De Bruin
et al. 1994; Allen 1997; Kuiter 1998). Observations were made on rocky
substrata between Vizhinjam, Kerala State and Muttom, Tamil Nadu State (Image 1), January–March
2002 (n=7 sites and 30 hours sampling). Similar habitat was examined at NatraniIsland, offshore of Murdeshwar, Karnataka State and
Grand Island offshore of Panaji, Goa State (Image 1),September–October 2002 (n = all surveys sum to 8
and 13 hours of observation time, respectively, for each of these two
sites). The habitat surveyed in
Kerala and Tamil Nadu (depth range 3–30 m) was rocky with low coral cover
(<1%) (Sluka et al. 2012). The most abundant benthic colonizers
were fine turf algae, encrusting sponges, barnacles and mussels. At Muttom,
three types of habitats were surveyed and each considered a separate site: (i) shallow (<10m), inshore (<500m from shore), dead
coral reef; (ii) offshore rocky islands (15m depth);and (iii) submerged rocky habitat (30m depth). The habitat in western coast off
Karnataka and Goa (depth range 2–12 m) was also rocky, but with higher
coral cover (15% and 31% for Natrani and Grand
Island, respectively). Other
abundant benthic colonizers at these two sites were fine turfingalgae, encrusting sponges, and polychaetes.
Species
lists were developed and then checked for prior occurrences in India using Fishbase (www.fishbase.org) last updated on 26 April
2012. Other literature was also
examined for occurrence records, including synonyms (Jones 1969; Murty 1969; Kuthalingam et al.
1973; Jones & Kumaran 1980; Fischer & Bianchi
1984; Murty et al. 1987; Allen 1991; Allen et al.
1998; Rao et al. 2000; Murty2002; Suresh & Thomas 2007).
Results
A
total of 184 species from 41 families were recorded in the study. The most speciosefamily was Serranidae (S=20), followed by the Acanthuridae (S=18), Labridae(S=18), and Pomacentridae (S=16) (Table 1). Nocturnal and cryptic families such as
the Gobiidae, Blennidae,
and Scorpaenidae were present, but not identified
till the generic or species level due to difficulties with visual
identification. Other habitats such
as mangrove forests, sand and mud flats, and deeper rocky reefs should also be
surveyed in order to develop complete checklists for this region. Based on Fishbaserecords and relevant literature, we observed 12 species that were not
previously recorded from India (6.5% of all species observed). Twenty twospecies were recorded in other literature as occurring in India as well as
being observed during this study. These should be added to occurrence records in Fishbase. Most of the non-commercial species
observed are recorded from the western coast of India for the first time. Previous records of these species in
India are usually from the Lakshadweep, or the Andaman and Nicobar Islands.
Discussion
All
of the new records came from families of fish that are small and not usually
commercially exploited. The
exception being species within the family Acanthuridae which are likely caught artisanally. None of the species within these
families have been assessed for their IUCN Red List status (see IUCN
2011). Only a few families of
marine fish have been assessed for Red List status. All species of angelfish (Pomacanthidae) observed have been assessed as Least Concern
(LC), and also the species of Butterflyfish (Chaetodontidate), with the exception of Chaetodon andamanensis which is Data Deficient (DD) (Myers & Pratchett 2010). Fishbase lists this species as ocurring in India, Indonesia, and the Maldives. Studies of this species would be of
conservation value as there is little data to understand its current
conservation status. Both
parrotfish (Scaridae) species observed were in the
Least Concern category. All wrasses
(Labridae) observed were of Least Concern status,
with the exception of the Humphead Wrasse Cheilinus undulatus,
which is listed as Endangered (EN) (Russell 2004). In this study, this species was observed
in low numbers (Sluka & Lazarus 2005). In another study, Nair (2004) reports on
a specimen landed at Cochin Fisheries Harbour. This species is sought after in the live
fish food trade and in many locations it is severely overfished. One species of shark Nebrius ferrugineus (Tawny Nurse Shark) was
observed. This species is
Vulnerable in the IUCN Red List (Pillans 2003).
Twentyserranids (Serranidae) were
observed, 18 of these assessed for Red List status, with 10 in the LC
category. Species that were DD
included Aethaloperca rogaa (Heemstra et al. 2008a), Epinephelus erythrurus (Heemstra et
al. 2008b), and E. faveatus (Russell et
al. 2008). The first species is a
widespread Indo-Pacific species, but usually locally not very abundant. It is also not often caught in
commercial fisheries. Fishbase states that nothing has been published on the
biology of E. erythrurus and so this
represents an opportunity to remedy its DD status. The distribution of E. faveatus is currently only known from southern India,
Sri Lanka and Indonesia, so researchers in this area could contribute to a
better understanding of its biology. Three species of serranid were Near Threatened
(NT): E. coioides (Cornish & Harmelin-Vivien 2004), E. diacanthus (Sadovy et al. 2008), and E. malabaricus (Cornish 2006). The distribution of E. diacanthus is restricted to the continental northern
Indian Ocean. Effort should be put into understanding fishing pressure on this
species and developing conservation measures to halt overfishing. The other two species are large with
maximum sizes over 1m and weighing 150kg, and heavily targeted globally for
food. Two species observed were listed as Vulnerable (VU): E. lanceolatus (Man & Chuen2006) and Plectropomus areolatus (Thierry et al. 2008). Both
species are large, with the former reaching 2.7m in length and 400kg. For all grouper species, fishery
regulations and implementation of conservation measures, including marine
protected areas should be implemented.
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