Abstract:The work examines the algal mass present as a source of nutrient in the lakes and ponds for fishes in lower Sindh region. During the study 46 species and 15 varieties of Chlorococcales belonging to Actinastrum (1), Ankistrodesmus (5), Botryococcus braunii (1), Characium (4), Characiopsis (1), Chodatella (1), Coelastrum (2), Crucigenia (1), Dicanthos (1), Dimorphococcus (1), Gloeotaenium (1), Golenkinia (1), Hydrodictyon (1), Kirchneriella (2), Nephrochlamys (1), Oocystis (4), Pediastrum (9), Planktosphaeria (1), Scenedesmus (23), Sorastrum (1), Selenastrum (1), Tetraedron (7), Tetrastrum (1) are described of these Hydrodictyon reticulatum, Tetraedron pentadricum, Sorastrium americanum, Dicanthos belenophorus, Nephrochlamys subsolitaria are reported first time from lower part of Sindh,Pakistan.

Fifteen Taxa representing 7 species of the Chara, 2 species of Ntella, and 1 species of lamprothaminum succinctum and Nitellopsis obtusa have been identified and described from fresh water lakes and ponds. It was noted that the species of chara are indicator of the presence of fish. These species were observed within pH 7.8 to 8.5 and total dissolved solids 260-580 mg/l. Chara globularis f.connivens R.D.W was present in kinjhar lake, while Nitellopsis obtusa was commonly found in kinjhar lake (Distt. Thatta) and Bakar lake (Distt Sanghar) at the depth of 3 -20 feet.

Water samples were collected from ecological important Kinjhar and Haleji Lakes during 1998-1999 and were analysed for conductivity, total dissolved solids, hardness, chloride, alkalinity, dissolved oxygen, nitrate, silica, orthophosphate, sodium, potassium, calcium and magnesium metal ions. The water quality was observed within the limits for drinking purposes, but there is an extensive growth of algae and higher aquatic plants in both the lakes. Total of 205 algal species were identified, comprising 43 sp. of Cyanophyta, 92 sp. Chloruphyta, 6 sp. Charophyta, 11 sp. Euglenophyta, 57 sp. of Bacillariophyta. Higher aquatic plants belonging to 31 species were also identified. Zooplanktonic fauna of both the lakes were quite different. The Cladoceran species. Ceriorlaphnia cornuta, Bosminopsis deitersi, Diaphanosoma hrachyurum and Bosmina longirostris were dominant, at Kinjhar. In Haleji lake, on the other hand Macrothrix sp., Chydorus sp., Sirnocephalus vetulus and Moina sp. were dominant.

Abstract:The Tidal Link is constructed to dispose off the drainage water from Nawabshah, Sanghar, Mirpurkhas and Badin districts to Shah Samando Creek. It is connected with brackish water lakes belonging to Run of Kuch and Shah Samando Creek of Arbian Sea in District Badin. These lakes were examined in terms of biological life and water quality. The Sonahro and Mehro are saline lakes rich in primary productivity with 114 species of algae, 17 species of aquatic plants and five species of fresh water fish. Among the fishes Cirrhinus mirgala, Channa marulia, Notopterus notopterus, Oreochromis mossambicu's, Rita rita, Wallagoattu were identified and all are commercially important. Water quality revealed , value of pH as 7.7-8.0, conductivity, 2.74-9.97 mS/cm and salinity 1.5-5.9 ppt with a number of nutrients. Pateji and Cholari are brackish water lakes. Majority of algal flora belong to Bacillarophyta, Cyanophyta and Enteromorpha species of Chlorophyta. Beside, 28 species of fish and 8 species of shrimps were identified.

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