Table 1.
Details of collection site of different groups of Tenualosa ilisha.
| Size group of fish (g) | Group | Source of the collection (Habitat) | Latitude (N) | Longitude (E) | Salinity (ppt) | No. of samples | Plankton status in gut |
Collection Season (2013–2016) |
|---|---|---|---|---|---|---|---|---|
| <5 | Ia | Kakdwip lot 8 (Brackishwater) | 21.8820° | 88.1645° | 3–15 | 50 | Coscinodiscus sp., Biddulphia sp. | January- March, May, June, August- December |
| 5–100 | IIa | Frasergunj (Marine) | 21.5560° | 88.2263° | 30–35 | 20 |
Coscinodiscus sp., Biddulphia sp., Copepod, Nitzschia sp., Pleurosigma sp., Thalassiothrix sp. |
September, November, December |
| Namkhana (Marine) | 21.7699° | 88.2315° | 20–30 | 15 | ||||
| Kakdwip lot 8 (Brackishwater) | 21.8820° | 88.1645° | 2–13 | 15 | ||||
| 101–200 | IIIa | Frasergunj (Marine) | 21.5560° | 88.2263° | 30–35 | 18 | Coscinodiscus sp., Biddulphia sp., Copepod, Nitzschia sp., Pleurosigma sp., Thalassiothrix sp., Ulothrix sp., Ceratium sp. | March, May, August, December |
| Namkhana (Marine) | 21.7699° | 88.2315° | 20–30 | 19 | ||||
| Kakdwip lot 8 (Brackishwater) | 21.8820° | 88.1645° | 2–13 | 13 | ||||
| 201–400 | IVa | Godakhali (Freshwater) | 22.3923° | 88.2023° | 0 | 42 |
Copepod, Coscinodiscus sp., Biddulphia sp., Ulothrix sp., Chaetomorpha sp., Diatoma sp., Coccolithophore, Asterionella sp., Diploneis sp., Oscillatoria sp. |
March, May, August, September |
| Kakdwip lot 8 (Brackishwater) | 21.8820° | 88.1645° | 2–13 | 8 | ||||
| 401–600 | Va | Frasergunj (Marine) | 21.556° | 88.2263° | 30–35 | 11 |
Biddulphia sp.,Copepod, Ulothrix sp., Chaetomorpha sp., Diatoma sp., Nitzschia sp., Pleurosigma sp., Asterionella sp., |
March, June, August, November |
| Namkhana (Marine) | 21.7699° | 88.2315° | 20–30 | 9 | ||||
| Kakdwip lot 8 (Brackishwater) | 21.8820° | 88.1645° | 2–13 | 5 | ||||
| Godakhali (Freshwater) | 22.3923o | 88.2023° | 0 | 25 | ||||
| 601–800 | VIa | Frasergunj (Marine) | 21.5560° | 88.2263° | 30–35 | 13 |
Biddulphia sp.,Copepod, Ulothrix sp., Chaetomorpha sp., Diatoma sp., Nitzschia sp., Pleurosigma sp., Asterionella sp., Diploneis sp., Rhizosolenia sp., Coscinodiscus sp. |
March, August, September, November, December |
| Namkhana, (Marine) | 21.7699° | 88.2315° | 20–30 | 11 | ||||
| Kakdwip (Brackishwater) | 21.8820° | 88.1645° | 2–13 | 12 | ||||
|
Sultanpur (Brackishwater) |
22.1987° | 88.2023° | 0.5–3 | 9 | ||||
| Godakhali (Freshwater) | 22.3923° | 88.2023° | 0 | 5 | ||||
| >800 | VIIa | Kakdwip lot 8 (Brackishwater) | 21.8820° | 88.1645° | 2–13 | 34 |
Coscinodiscus sp., Biddulphia sp., Nitzschia sp., Diatoma sp., Copepod |
December |
| Nischintapur (Brackishwater) | 21.9978° | 88.1908° | 2–13 | 16 | ||||
| >800 | VIIIb | Nirmal char (Freshwater, Padma river) | 24.340205° | 88.4560° | 0 | 50 | Copepod, Cladocerans, Ulothrix sp. | December |
aFish of groups I to VII were collected from different locations of Hooghly river system.
bFish of group VIII were collected from the Padma river system.