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Detailed Ecological Assessment Report 2008 – Keenjhar Lake 3.7.3 Aquatic macro-invertebrates found in Keenjhar • Macrobrachium malcolmsonii Order : Decapoda Suborder : Natantia Infraorder : Caridea Superfamily : Palaemonoidea Family : Palaemonoidae Subfamily : Palaemoninae Genus : Macrobrachium (De Man, 1879) Species : malcolmsonii This is a freshwater species captured from Keenjhar Lake is a prawn of commercial importance. This giant prawn of river Indus grows up to 250 grams. This prawn breeds from March to October and its larvae grow in brackish water. The larvae after attaining post-larval stage in about 30-45 days migrate towards freshwater. Their upstream migration is recorded at Kotri Barrage, Jamshoro and can be collected for stocking in ponds and inland water. • Macrobrachium dayanum (Henderson, 1893) Order : Decapoda Suborder : Natantia Infraorder : Caridea Superfamily : Palaemonoidea Family : Palaemonoidae Subfamily : Palaemoninae Genus: Macrobrachium (De Man, 1879) Species: dayanum (Henderson, 1893) The other prawn Macrobrachium dayanum found in the Keenjhar Lake is an effectively large and vigorous freshwater species. It is perhaps the most abundant prawn species of this lake and is caught in abundance by the fishermen though according to them its population has also reduced to a great extent recently. Its healthy size is indeed a significant factor that has made this prawn a marketable item and it is thus an allure for the fishermen of the area. The decrease in its production is also owing to the fact that the other prawn species has literally reduced to rarity and therefore the fishermen have swiftly shifted to the dayanum species. 3.7.4 Aquatic micro-invertebrates found in Keenjhar Image 8 – Macrobrachium dayanum • Copepoda Myriads of zooplankton captured during sampling from Keenjhar Lake during summer and winter surveys were investigated and found to belong to the subclass Copepoda of the class Crustacea. The Copepod population WWF Pakistan – Indus for All Programme Page 78 of 165
Detailed Ecological Assessment Report 2008 – Keenjhar Lake was found to decline tremendously during the winter. Copepods belonging to the genus Mesocyclops were also found to be abundant. Phylum Arthropoda Class Crustacea Subclass Copepoda Order Cyclopoida Family Cyclopidae Genus Mesocyclops Species Mesocyclops leuckarti Phylum Arthropoda Class Crustacea Subclass Copepoda Order Cyclopoida Family Cyclopidae Genus Tropocyclops Phylum Arthropoda Class Crustacea Subclass Copepoda Order Cyclopoida Family Cyclopidae Genus Macrocyclops Species Macrocyclops ater Macrocyclops macreuus • Midge fly-larvae Midge fly (family - Chironomidae, order - Diptera) larvae were also abundant in Keenjhar Lake and at various places in the reservoir ample sampling of these was done during the summer as well as the winter survey through the plankton net. A moderate population of midge fly larvae was observed and caught in Keenjhar Lake during the summer as well in winter, though the number of these larvae was much more plentiful during the winter. These flies are usually found in all but the most polluted aquatic conditions. Presence of Midge flies in large numbers indicates that there is an organic enrichment in the water-body that they dwell in. This also indicates that the effect of pollutants, human waste and other effluents getting added in to the reservoir has not yet turned drastic in terms of its damaging effect on the micro-invertebrate population of the reservoir. 3.7.5 Terrestrial invertebrates at Keenjhar • Order Araneae A number of spiders captured from the adjoining areas of Keenjhar Lake were catalogued and identified at the genus level. Following is their taxonomic hierarchy. There is a very diverse and healthy population of spiders belonging to various families in the vicinity of both study areas. WWF Pakistan – Indus for All Programme Page 79 of 165
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