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Taxonomic Study on the Supposed Hybrids of Indian Major Carps and Chinese Carps in the Local Markets of Khulna, Jessore and Satkhira District, Bangladesh

Shamima Sultana*
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Md. Saifuddin Shah
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Alokesh Kumar Ghosh and
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Joyanta Bir
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Abstract/ Executive Summary:

The present study deciphers the extent of the activity of heterospecific mixing of gametes and production of hybrids that are available as food fishes in the markets of Khulna, Jessore and Satkhira districts during March to July, 2009. The taxonomic characters of two putative hybrids from 150 samples namely Catla catla × Labeo rohita and Labeo rohita × Labeo calbasu were studied and compared with their original species and significant differences were found in most of the meristic characters and morphometric proportionsat 5% level of significance. The two hybrids were not found to be intermediate between their original species for most of the characters. Catla catla × Labeo rohita deflected more toward catla; while Labeo rohita × Labeo calbasu toward calbasu, however, the hybrid does not have barbel as with calbasu. The results of the study revealed a grave situation of fishes’ gene pool mixing in the hatcheries.

Keywords: Taxonomy, Putative hybrids, Character, Catla×rohu, Rohu×calbasu

Location: Markets of Khulna, Jessore and Satkhira districts

Start Date: 07-03-2009

End Date: 00-07-2009

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

The hybrids as a rule should show intermediate characters and the preponderant hybrids that were collected from the market were judged for the morphometric and meristic characters. The present study was conducted to findout the extent of the activity of heterospecific mixing of gametes and production of hybrids that are available as food fishes in the markets of greater Khulna, Jessore and Satkhira district. The results of the research revealed a grave situation of fishes’ gene pool mixing in the hatcheries. Unintentional and unplanned heterospecific mixing of gametes is detrimental for the specie’s gene pool from genetical view point. This leads to introgression of gene pool and can bring havoc in the population of the cultivable species.

Methodology:

The present study was carried out on samples collected randomly from the local markets of Khulna, Jessore and Satkhira districts during March to July 2009. Different types of putative hybrids of Indian major carps and chinese carps were collected randomly. A total of 150 samples were sampled for taxonomic study. Samples of the putative hybrids (catla×rohu, rohu×calbasu) & single species of catla, rohu and calbasu were collected and were immediately preserved in ice box.

Fifteen morphometric characters viz., the total length (TL), standard length (SL), fork length (FL), height of the body (BHt), head length (HL), length of the upper jaw (LUJ), pre-orbital length (PrOL), eye diameter (EDia), post-orbital length (PsOL), pre dorsal length (PrDL), length of dorsal fin base (LDFBs), height of the dorsal fin (HtD), least depth of caudal peduncle (LtDtCP), length of caudal peduncle (LCP), length of anal fin base (LAFBs), and height of pelvic fin (HtP) was recorded separately following standard methods.

Nineteen meristic characters (countable characters) were counted including scale on, above and below the lateral line, number of fin ray of dorsal, caudal, anal, pectoral and pelvic fins of the fish.

Source of Information: Khulna University Studies Volume 13 (1) : 55-64 : January-June 2016

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The incidence of hybridization was very frequent especially between catla and rohu than between rohu and calbasu; other types of crosses were quite rare. In the present study, most of the morphometric and meristic characters showed significant differences between putative hybrids and their single species. But the characters that are actually desired in the hybrids were found almost absent in the putative hybrids except in few cases. Most of the characters of putative hybrids were not found in intermediate-range and some were found deflected more toward the original species which actually not desirable in aquaculture. But few characters were positive in that regard. Unplanned heterospecific mixing of gametes is detrimental, for it can bring introgression of the gene pool of the concerned species and bring havoc in the natural gene pool of cultivable species. So, unplanned hybridization should be stopped. The modern technique of genetic variation should be applied for correct and faster taxonomic identification of the hybrids.

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