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October 1997 - present
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Publications (77)
This study represents the initial contribution to understanding the population structure and reproductive biology of the
pebble crab Philyra corallicola, inhabiting the intertidal zone of Clifton, Pakistan. Over a span from November 2009 to
February 2011, a total of 501 individuals were systematically collected, and their reproductive and relative...
This study represents the initial contribution to understanding the population structure and reproductive biology of the pebble crab Philyra corallicola, inhabiting the intertidal zone of Clifton, Pakistan. Over a span from November 2009 to February 2011, a total of 501 individuals were systematically collected, and their reproductive and relative...
The growth and reproductive/ brooding pattern of Megabalanus tintinnabulum were studied from January 2012 to December 2013 on two rocky shores, Buleji and Manora, Karachi, the northern Arabian Sea. Population parameters were estimated using the von Bertalanffy growth function (VBGF) and ELEFAN 1 with the aid of FiSAT software. The population of M....
The reproductive status of Echinometra mathaei was studied at rocky shore of Buleji, Pakistan, North Arabian Sea from April 2011 to November 2012. This study investigated reproduction of this species by histological examination in order to characterize the reproductive pattern and evaluate the relationship with temperature, salinity and chlorophyll...
Accurate measurements of weight and length in sea cucumbers are difficult due to body wall elasticity. The compound indices that combine different biometric parameters can be utilized to obtain more precise biometric relationships. We estimated parameters of the von Bertalanffy growth functions like K, L∞ and t0 in Holothuria arenicola. Total lengt...
Population dynamics parameters of Rastrelliger kanagurta (Cuvier, 1816) were analyzed from January to December 2008 in coastal waters of Pakistan. FiSAT software was used to assess growth population dynamics parameters. The growth parameters K = 0.84 year–1 and L∞ = 24.57 cm were estimated with the aid of von Bertalanffy growth function. The natura...
Objective
The present study was conducted to investigate the biomass assessment, morphological and molecular identification, nutritive status and biochemical characterization of three major Thais species ( T. bufo , T. hippocastanum and T. rudolphi ) from the Sindh Coast, Pakistan.
Methods
Samples were collected from Buleji and Paradise Point at t...
The aim of the current study was to determine common physico-chemical parameters (salinity, temperature, chlorophyll-a, dissolved oxygen, and pH) of coastal water of two rocky shores from Buleiji and Paradise Point rocky shores at Karachi monthly basis, from November 2007 to April 2009. The range of air and surface water temperature of Buleji varie...
The aim of the current study was to determine common physico-chemical parameters (salinity, temperature, chlorophyll-a, dissolved oxygen, and pH) of coastal water of two rocky shores from Buleiji and Paradise Point rocky shores at Karachi monthly basis, from November 2007 to April 2009. The range of air and surface water temperature of Buleji varie...
The concentrations of protein, carbohydrate and lipid were measured in the ovaries and body tissue of the barnacles, Megabalanus tintinnabulum Linnaeus, 1758 during the ovarian maturation stages that is, immature, growing and mature. The protein, carbohydrate and lipid concentrations increased significantly in ovarian tissue with the advancement of...
The length frequency, length-weight relationships and variation in condition factor was studied in the population of Echinometra mathaei (Blainville, 1825) found on the rocky shore of Buleji, Karachi, Pakistan during the period from April 2011 to November 2012. The test diameter (length) in E. mathaei ranged from 19.0 and 77.2 mm with mean test dia...
Fatty acids (FAs) profile of prosobranchneogastropod species Thais cariniferawas analyzed. Morphologically tested imposex, normal female and male individuals of Thais carinifera were examined and variation in fatty acid profiles among all three target groups was investigated in digestive gland/ gonad complex by using gas chromatography mass spectro...
Endocrine mediated "imposex" phenomenon was
investigated and recorded in the muricoid gastropod
species Thais carinifera during the two decades from
1993 to 2012 at three (3) sites out of six (6) localities
investigated along the Sindh and Balochistan coast,
Pakistan. The VDS stages 1 to 4 were apparent in
Thais carinifera. The intensity of imposex...
The true limpets are found in the intertidal zone of the rocky shores of Pakistan, North Arabian Sea. Partial sequence of the mitochondrial cytochrome oxidase I was used to estimate the degree of genetic differentiation among the morphological forms of Cellana, which were considered as three separate species earlier in Pakistan. The study revealed...
Pathological changes are regarded as a standard technique to monitor the effects of pollutants in marine animals. Histopathological examination of the population of green mussel Perna viridis (L.) from four sites in Pakistan, namely, Manora Channel, Rehri Creek, Sandspit Backwaters and Bhanbore was conducted. The first three sites are on the Karach...
The pea crab
Nepinnotheres villosulus
is recorded for the first time from Sonmiani, Pakistan. It was found in six species of clams,
Meretrix casta, Marcia recens, Callista umbonella, Gastrana multangula, Protapes cor
and
Psammotreta angulata
and in one species of blood cockle,
Anadara antiquate,
with the highest prevalence in
Meretrix casta
. In so...
In Pakistan, although the sea cucumber fishery has not yet been developed, Holothuria arenicola is abundant on its coast. Nineteen months of sampling was carried out to study the population structure, allometric relationships and reproductive status of H. arenicola stocks in Manora and Buleji rocky shores. All measured biometric characters showed s...
Blooms of jellyfishes were studied at 3 sites, namely Bhanbore, Mirpur Sakro, and Keti Bunder. The sampling was carried out from April 2005 to March 2006. Only 2 species of jellyfish, Catostylus perezi and Rhizostoma pulmo, were found in samples. C. perezi was present at all 3 sampling sites, whereas R. pulmo was found only at Keti Bunder. Specimen...
The length-weight relationship and condition factor is determined for Holothuria arenicola collected between April 2011 to November 2012 from rocky shores of Manora and Buleji. The maximum total length recorded for this species was 416.0 mm at Manora and 376.0 mm at Buleji. Sex-wise and season wise LWR and slope (b) values revealed the negative all...
Histological study was performed in order to observe gonadal cycle and gametogenic pattern of common top shell Monodonta canalifera at two rocky shores; Buleji and Manora Channel along the Karachi coast. Studies were taken during June 2005 to July 2006 followed by monthly intervals and samples were examined on histological basis. The oocyte diamete...
Fatty acid composition was determined in three pulmonate gastropod species, Siphonaria ashgar, S. belcheri and S. kurracheensis inhabiting the high, mid and low tidal zones on the coast of Mubarak Village, Karachi, Pakistan. Eleven fatty acids were abundant in all three species, that is, palmitic acid, stearic acid, palmitoleic acid, oleic acid, va...
This work presents the fatty acids methyl esters (FAME) profile of neogastropod species Babylonia spirata from Manora Channel, the area subjected to intensive shipping activity. A total of 39 compounds including fatty acids methyl esters (FAME), dimethyl acetals (DMA) of fatty aldehydes, non-methylene-interrupted (NMI) acids were separated and iden...
This work presents the fatty acids methyl esters (FAME) profile of neogastropod species Babylonia spirata from Manora Channel, the
area subjected to intensive shipping activity. A total of 39 compounds including fatty acids methyl esters (FAME), dimethyl acetals
(DMA) of fatty aldehydes, non-methylene-interrupted (NMI) acids were separated and iden...
Sex ratios, size frequency, and reproductive patterns of blood cockle Anadara antiquata were studied from Sonmiani and Phitti Creek, Pakistan, from May 2004 to April 2005. At both sites, the overall sex ratio was significantly in favor of females. The population of A. antiquata at Sonmiani consisted of cockles of 31-80 mm in size and that at Phitti...
The present study deals with the occurrence and abundance the macrobenthic crustacean fauna which was studied during the period of January to December 2006, from mangrove swamps of Sandspit backwaters. This is the first report related to the benthic crustaceans present up to a depth of 12-15 cm in sediments of mangroves. The study site was densely...
The fish randomly picked from the fish lot lying in the hall of the Karachi Fish Harbour for auction were examined for a period of one year from August 2007 to July 2008 to find out the prevalence and intensity of parasites in different species. Out of 44 species of fish examined, 22 species were found to be infected by parasites and a small sciaen...
Length-length and length-weight relationship and condition factor is described for Cellana karachiensis (Winckworth, 1930) collected between November 2007 and April 2009 from rocky shores of Buleji and Paradise Point. Maximum total length registered for this species was 50 mm at Buleji and 40 mm at Paradise Point. Shell length-shell width, shell le...
Comparative studies were carried out to assess contamination impact related to shipping activity on reproductive fitness of two archaeogastropod species, Turbo coronatus and Monodonta canalifera from Manora Channel, a possible organotin contaminated site and Buleji, the reference site. This study was initiated in view of the fact that Manora Channe...
Comparative studies were carried out to assess contamination impact related to shipping activity on
reproductive fitness of two archaeogastropod species, Turbo coronatus and Monodonta canalifera from Manora
Channel, a possible organotin contaminated site and Buleji, the reference site. This study was initiated in view of the
fact that Manora Channe...
The coast of Pakistan (North Arabian Sea) is under the influence of the seasonal cycle of monsoons, which may result in 2 periods of elevated phytoplankton productivity, one during the north-east monsoon (December-February) and the other during the south-west monsoon (May-September). In the present study, elevated primary productivity in the Miani...
The present study quantifies the concentrations of proteins, carbohydrates, and lipids in the hemolymph, ovary, hepatopancreas, and muscle of Fenneropenaeus merguiensis and F. penicillatus during ovarian maturation. Proteins were the major constituent in the hemolymph and ovaries of the 2 species, while lipids were the major constituent in the hepa...
In the present study hexane, chloroform, methanol, distilled water, hexane:chloroform, chloroform:methanol and methanol:distilled water extracts of three species of Siphonaria, S. ashgar, S. belcheri and S. kurracheensis were screened for antibacterial and antifungal activity. The extracts were obtained from the whole body tissue and tested against...
This is the first report of the occurrence of imposex in the neogastropod Babylonia spirata (Linnaeus, 1758) from Pakistani waters. Studies were carried out at Manora Channel, which is situated in the vicinity of Karachi port and fish harbor, the hub of commercial boating activity in Pakistan. Other two sites Buleji and Sonmiani are free of such ac...
This is the first report of the occurrence of imposex in the neogastropod Babylonia spirata (Linnaeus, 1758) from Pakistani waters. Studies were carried out at Manora Channel, which is situated in the vicinity of Karachi port and fish harbor, the hub of commercial boating activity in Pakistan. Other two sites Buleji and Sonmiani are free of such ac...
Fatty acid composition was determined in two candidate aquaculture species Fenneropenaeus merguiensis and F. penicillatus sampled from Karachi, Pakistan. Five fatty acids, that is, docosahexaenoic acid (DHA), eicosapentaenoic acid (EPA), oleic acid (18:1n-9), palmitic acid (16:0) and stearic acid (18:0) were particularly abundant in the muscle tiss...
Annual reproductive cycle and spawning ecology of Kelee shad, Hilsa kelee were studied. The sex ratios did not exhibit as 1: 1; whereas 69.19% were females. On the basis of histological examination, the maturity of female gonads of H. kelee was categorized in eight developmental stages: immature, developing, fully developed, hydrated, running ripe,...
Imposex has been recorded for the first time in the neogastropod Morula granulata (Duclos, 1832) from Manora Channel, which is one of the largest shipping hub in Pakistan. No previous record of imposex is available for this marine intertidal species in Pakistan. Although the degree of imposex was not much pronounced. 8% imposex and 16% imposex inci...
Gastropod species were examined from nine sites along the coasts of Sindh and Balochistan, Pakistan. Ten species of gastropods namely, Monodonta canalifera (Lamarck, 1801), Turbo coronatus (Gmelin, 1791), Thais carinifera (Lamarck, 1816), T. bufo (Lamarck, 1822), T. hippocastanum (Linnaeus, 1758), T. rudolphi (Lamarck, 1822), T. tissoti (Petit, 185...
Gastropod species were examined from nine sites along the coasts of Sindh and Balochistan, Pakistan. Ten species of gastropods namely, to two orders namely, Archaeo-and Neogastropoda and five families (Trochidae, Turbinidae, Thaidae, Turridae, and Buccinidae) were studied. The species were identified on the basis of their chonchological characteris...
In the present study eight species of clams and one species of blood cockle identified on the basis of their conchological features have been reported. The two genera, Tellinimactra angulata. Gastrana multangula, belongs to the family Tellinidae and Circenita callipyga, Protapes cor, Marcia marmorata, opima, Amiantis umbonella and Meretrix casta va...
The length-weight relationship and condition factor for Ilisha melastoma (Bloch and Schneider, 1801) is described from samples collected between March 2004 and March 2005. The maximum standard length registered for males and females was 19.7 cm and 19.8 cm, respectively. The length-length relationship between the total length (TL), fork length (FL)...
The present study showed the occurrence of three species of Siphonaria, namely, S. ashgar, S, belcheri and S. kurracheensis on the rocky coast of Mubarak village, Karachi, Pakistan. Keeping in view the biomedical interest in the high molecular mass hemocyanin of the marine mollusc, the study provides for the first time, the basic knowledge about th...
This study is the first to describe the reproductive pattern of anadroumous fish Tenualosa ilisha based on the histological examination of male and female gonads. The overall sex-ratio was close to 1:1 ratio. The five stages of oogenesis, nearly ripe, fully developed, running ripe, partially spent and spent and four distinct phases of ovarian atres...
A total of 397 specimens of Alepes djedaba were examined during the study period from March 2009 to April 2010, except June and July when the ban on fishing was imposed. The samples were procured from the landings at Karachi Fish Harbour. The maximum length for male of Alepes djedaba was 38.5 cm and for female 37.0 cm. Most of the males and females...
Present study showed that the over-all sex-ratio deviated in favour of females in Ilisha melastoma. However, the sexratio was approximately 1:1 in certain months while in others it was in favor of females. Similarly the sex-ratio deviated from 1:1 ratio in different size-classes. Minimum size at which the specimens of I. melastoma get matured is 14...
In the present study three species of Siphonaria, viz., S. ashgar, S. belcheri and S. kurracheensis were identified on the rocky coasts of Karachi. Two species, S. ashgar and S. belcheri are being reported for the first time from Pakistan whereas S. kurracheensis was already reported earlier.
The impact of temperature and rainfall was analyzed on the catch of estuarine fish and shrimp species, including barramundi, mullet, bombay duck, silver whiting, sardinella, an-chovy, white shrimp and grey shrimp during the period 1981 to 2006. On the whole there was no significant correlation found between the catch of various fish and shrimp spec...
Nine different species of oysters belonging to the genera Crassostrea, Saccostrea, and Ostrea occur naturally along Pakistan's coastline in the northern Arabian Sea. At the present time, no commercial harvesting or hatchery culture of oysters exists in Pakistan. The world's oyster aquaculture industry is seriously affected by diseases caused by par...
Increased environmental regulations and loss of crops due to viral disease outbreaks have created a demand for productive, pathogen-free, efficient and sustainable shrimp production practices. These methods, for the most part, call for raising shrimp under limited, minimal, water exchange with careful monitoring of water quality. Two studies were c...
World Aquaculture Magazine, 37: 44-48. World Aquaculture Society, USA.
Molluscan Biodiversity in Pakistan
Zarrien Ayub1, Ghazala Siddiqui and Shaista Hameed
The population of Pakistan is 142.5 million, estimated mid year 2001, and is increasing at an alarming rate. At present protein consumption is 5-10 kg per capita per annum. This consumption...
Thirteen species of penaeid shrimps, namely, Fenneropenaeus merguiensis, F. penicillatus, F. indicus, Penaeus semisulcatus, Metapenaeus affinis, M. monoceros, M. brevicornis, M. stebbingi, Parapenaeopsis stylifera, P. hardwickii, P. sculptilis, Parapenaeus longipes and Metapenaeopsis stridulans were examined in the present study. With the exception...
In this study, four species of penaeid shrimp from Pakistan's inshore waters were studied. These were Penaeus penicillatus (Alcock), Penaeus merguiensis (de Man), Metapenaeus affinis (Milne Edwards) and Parapenaeopsis stylifera (Milne Edwards). During maturation, shrimp ovaries pass through a series of colour changes. The various colours observed i...
The spawning seasons of four species of penaeid shrimp, Penaeus penicillatus (Alcock), P. merguiensis (de Man), Melapenaeus qffinis (Milne Edwards) and Parapenaeopsis stylifera (Milne Edwards) from Pakistan's inshore waters were studied on the basis of ovarian colour and ovarian histology. During maturation shrimp ovaries pass through a series of c...
The present study shows the distribution and abundance of the juveniles of penaeid shrimps on the Sindh coast. The localities included in the survey were Sandspit, Bhanbore, Kharo Chaan, Jhangi Sir and Keti Bunder. The following seven species of shrimps were collected during this study. Metapenaeus monoceros, M. affinis, M. stebbingi, M. tysianassa...
The shrimp landings at the Karachi Fish Harbour were found to be comprise of 13 species of penaeids. These were: Penaeus penicillatus, P. merguiensis, P. indicus, P. semisulcatus, Metapenaeus affinis, M. monoceros, M. brevicornis, M. stebbing, Parapenaeopsis stylifera, P. hardwickii, P. sculptilis, Parapenaeus longipes and Metapenaeopsis stridulans...
Juveniles of fish, shrimps and crabs were collected from Korangi Creek (Sindh coast, Pakistan) at weekly intervals during the period, December, 1993 to February, 1994. During this period the only shrimp species collected from the area was Metapenaeus stebbingi. From the data on length-frequency of M. stebbingi a growth of 0.28 mm/day was estimated....
The present study reports the distribution and abundance of the juvenile and subadult fishes from the Sindh coast. Bhatta Village, Sandspit and Korangi Creek, where high salinities prevail throughout the year, showed the presence of only marine fish species. The species which were abundant here were Liza subviridis, Sillago sihama, Therapon jarbua...
Virtually nothing has so far been documented of the marine resources of Miani Hor, an almost completely enclosed lagoon located on the coast of Balochistan, Pakistan. This study focusses attention on penaeid shrimps which when caught from this lagoon were found to belong to the species Penaeus merguiensis, P. penicillatus, P. indicus, Melapenaeus a...
The shrimp landings at the Karachi fish Harbour were found to be comprised of 13-species of penaeids. These were: Penaeus penicillatus, P.merguiensis, P. indicus, P. semisulcatus, Metapenaeus affinis, M. monoceros, M. brevicornis, M. stebbingi, Parapenaeopsis stylifera, P. hardwickii, P. sculptilis, Parapenaeus longipes and Metapenaeopsis stridulan...
