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Zooplankton-benthos Interrelationship in a Catfish Pond

M. A. Hossain
Department of Aquaculture and Management, Bangladesh Agricultural University, Mymenshingh

A. Islam
Department of Aquaculture and Management, Bangladesh Agricultural University, Mymenshingh

S. Dewan
Department of Aquaculture and Management, Bangladesh Agricultural University, Mymenshingh

S. Aliand
Department of Aquaculture and Management, Bangladesh Agricultural University, Mymenshingh

F. Begum
Department of Aquaculture and Management, Bangladesh Agricultural University, Mymenshingh

Abstract/ Executive Summary:

In a catfish rearing pond In Mymenslngh it was noted that Asplanchana exhibited strong (P < 0.001) Inverse correlation with Pelopia (r = - 0.800). Chiro·nomus (r = - 0.683) . Dero digitata (r = - 0.535). Ligumia (r = - 0.604). Lamellidens marginalis (r = - 0.563) and Metrocenimus kabi (r = - 0.645). Polyarthra and Euchlanis showed strong (P < 0.001) correlation with Pelopta (r = - 0.525) and L. marginalis (r = 0.530). Mesocyclops and Moina showed strong correlations (P < 0.001) with Brachionus sowerbyi. Ceratium showed direct relationship (P < 0.001) With Chironomus (r = 0.584). Ligumia (r = 0.631) showed Inverse correlation With Ephemerella (r = - 0.547).

Keywords: Zooplanktons, Benthos. Interrelationship, Correlation, Catfish pond

Location: Bangladesh Agricultural University, Mymensingh.

Start Date: 00-01-1984

End Date: 00-12-1984

Program Area: Animal Health and Management

Commodity: Cat fish

Objectives:

To identify the important food items for many fishes including catfishes and thus play a vital role in aquatic food chains

Methodology:

The study was conducted in a pond situated at the Bangladesh Agricultural University, Mymensingh. The area of the pond was 7260 sq ft. The average depth of water varied from 1.22 to 1.83 meter and the duration of the experiment was from January 1984 to December 1984. A cemented wall of about 0.3048 meter in height was constructed around the pond bank. The plankton samples were collected once in every month between 9 : 00 and 11 : 00 a.m. from 3 pre-selected stations. Collections were made by a Kemmerer type water sampler fn,m surface. mid and bottom water. Ten litres of water sample from earth depth of every of station were collected and filtered through a plankton net of 55 bolting silk. The plankton samples were immediately fixed in 4% formalin, and stored in refrigerator for subsequent studies. For analysis the stored samples were shaken well and then 1 ml was quickly drawn from it With the help of a pipette and placed on a SedgWick Rafter counting cell. The cover glass was placed carefully over the chamber to avoid air-bubles. A random microscope field was selected and identification and counting of planktons were done With the ocular micrometer grid. It was repeated 10 times. All planktons were identified to the level of genera and where possible upto species. The benthic samples were collected by using a 225 cm2 Ekman Dredge. For the convenience of the work 9 stations were selected. Among them, three stations were in the depth range of 0.30-0.60 m. three in the depth range of 0.60-2.74 m, and the other three more than 2.74 m depth. After collection the sample was seived by means of standard brass seives having mesh size 2.4, 1.2 and 0.2 mm. The residues were brought to the laboratory and the organisms were sorted out by placing them on white enamel. The organisms were preserved in vials with 10% formalin. Collected organisms were identified to the lowest possible taxa. Identifications were done. Mean and standard error of zooplanktons and benthos were calculated. Product correlation was also determined between pairs of selected variables.

Source of Information: Journal of the Asiatic Sociaty of Bangladesh Science 22(1): 19-24. 1996, ISSN 1016-6974

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Thirty available genera and species of zooplankton showed either positive or negative correlation with the abundance of 24 genera and species of benthos. Asplanchana exhibited more strong (p < 0.001) correlation with the various genera and species of benthos then others. Again, Rotarai, Testudinella, Brachionus forficula. Noiholca, Keraiella cochlearis, K. valga, Bosmina. Diapiomus, Cyclops. Moina. Paramecium. Ceratium and Trachelomonas did show more correlations with some genera and species of benthos than others. Little correlation values were noted among some genera and species of benthos with the Filinia, Brachionus patulus, Mesocyclops, Eubranchipus and Vorticella of zooplankton. It is important to note here that there eXisted insignificant (p < 0.05) correlation values of Daphnia and Ceriodaphnia with all the abundant genera and species of benthos where negative correlation values were more in number rather than positive ones. Asplanchana exhibited strong (p < 0.001) inverse correlation with Pelopia (r = - 0.800). The correlation values between zooplankton and benthos may be du to some physico-chemical and biological factors prevailing in the pond. The negative correlation values between zooplankton and benthos may be due to certtn benthos directly feeding on zooplankton. Several chironomid species feeding directly on filamentous plankton, as do various gastropods.

Knowledge Management: Journal