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  • Marine Record
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First record of the razorbelly scad Alepes kleinii (Bloch, 1793) (Carangidae) along the coast of Bangladesh

Marine Biodiversity Records201710:32

https://doi.org/10.1186/s41200-017-0134-x

  • Received: 6 March 2017
  • Accepted: 30 November 2017
  • Published:

Abstract

Background

The Bay of Bengal coast, Bangladesh is a hotspot of fisheries abundance and diversity. A new species of Carangid family Alepes kleinii is recorded and described for the first time in the coastal waters of Bangladesh.

Results

A total of 29 individuals of Alepes kleinii were collected from the surveyed areas between January to March, 2016. Validation of this species was confirmed by phenotypic characteristics including body and fins colour, shape, vertical stripes, number of fin rays etc. which were found to be identical to that of the Alepes kleinii described in existing literature. The regression parameter value (b = 2.81) of the length-weight relationship (W = aL b ) indicates that the Bay of Bengal provides favourable environmental conditions for the growth and development of this species.

Conclusion

The discovery of the razorbelly scad in these waters provide valuable information regarding species distribution and extension, location and habitat preference. This information is prerequisite for the sound management of the coastal fisheries of Bangladesh.

Keywords

  • Razorbelly scad
  • First record
  • Length weight relationship
  • Bay of Bengal coast
  • Bangladesh

Background

The razorbelly scad, Alepes kleinii (Bloch, 1793) is a reef associated, tropical marine fish species of the family Carangidae (Jack family).The dorsal surface of the Alepes kleinii is generally bluish grey to greenish grey, while ventral surface is lighter and more silvery in live specimens. In some specimens, dark vertical stripes are present above the lateral line and the presence of a large black spot on the upper operculum is also a key characteristic when identifying this species. The majority of the fins are transparent to pale in colour, with the caudal fin being predominantly yellowish. The razorbelly scad has predatory habits and generally preys upon small crustaceans, copepods, larval fish, lucifer shrimp, prawns, amphipods and fish eggs (Kalita & Jayabalan, 2000). It is widely dispersed throughout the Mediterranean Sea and Red Sea in the west (Adam, 1966), and most of the Indo-West Pacific region including the coast of Pakistan, south-eastern coast of India, Sri Lanka, Indonesia, Philippines, Taiwan, Papua New Guinea, Japan and northern Australia (Froese & Pauly, 2016). Although wide-ranging coast of Bangladesh is regarded as fisheries biodiversity hotspot (Chaklader et al., 2015; Hanif et al. 2015; Siddik et al. 2015; Chaklader et al. 2016; Siddik et al. 2016a; Siddik et al., 2017) but until this record, the razorbelly scad has previously been unreported in Bangladesh.

Therefore, this present study reports the occurrence of Alepes kleinii in the southwestern coastal waters of Bangladesh. This will represent the first record of a new species of the Carangidae family in this region, adding to the increasing list of carangid fishes inhabiting the fringes of coastal Bangladesh.

Methods

During a 3 month survey of the diversity of fish species in the coastal Baleswar River (22° 08′ 57” N, 89° 54′ 59″ E), Bishkhali River (21° 51′ 50” N, 90° 05′ 23″ E) and Burishwar River (21° 54′ 42” N, 90° 22′ 14″ E) from January to March, 2016 of southern Bangladesh, a total of 29 specimens of Alepes kleinii were collected by artisanal fishermen using gillnets. The fish were sourced from local markets within close vicinity of the aforementioned rivers. A typical sample of collected Alepes kleinii and its global distributed areas including Bangladesh are shown in Fig. 1 and Fig. 2, respectively. The captured specimens were preserved and transported to the laboratory for identification, morphometric measurements and meristic counts were conducted following standard methods. All morphometric measurements were recorded in centimeters (cm) taken with digital calipers and the weight of the fish samples were recorded to the nearest 0.01 g using digital electronic weighing balance (Shimadzu, EB-430DW, Japan).The length-weight relationship was calculated using the formula proposed by Ricker (1975) as:
$$ W={aL}^b $$
Fig. 1
Fig. 1

Razorbelly scad Alepes kleinii (Bloch, 1793) collected from the southern coast of Bangladesh

Fig. 2
Fig. 2

Global distribution of Razorbelly scad, Alepes kleinii (Bloch, 1793) including newly report in Bangladesh

Where, W is the weight of fish and L is the total length of specimen, a and b are the regression parameters of length weight relationship.

Results

A total of 29 specimens of Alepes kleinii were collected from fishermen’s catches for a period of three months from January to March, 2016 and identified as Alepes kleinii by a combination of characteristics using FishBase. Parameters used for identification included body colour (above and below lateral line), dark vertical strip, colour of caudal fin, black spot on operculum, number of dorsal fin, ventral spine, shape of caudal lobe, number of fin rays, strongly arched lateral line. The total length of collected specimens ranged from 8.6 to 15.8 cm and body weights varied between 9.61 to 51.47 g. All morphometric measurements and meristic counts recorded from the specimens are presented in Table 1. The results of length weight relationship are presented in Fig. 3.
Table 1

Morphometric measurements and meristic counts of razorbelly scad, Alepes kleinii (Bloch, 1793) collected from the southern coast of Bangladesh (n = 29)

Morphometric measurement

Acronym

Length range (cm)

Mean ± SD

Minimum

Maximum

Total length

TL

8.6

15.8

11.3 ± 1.76

Fork length

FL

7.9

13.5

9.8 ± 1.47

Standard length

SL

7.2

11.8

9.3 ± 1.13

Body depth

BD

3.9

4.9

4.4 ± 0.30

Caudal peduncle

CP

0.4

0.6

0.5 ± 0.01

First pre-dorsal length

FPrDL

3.1

4.2

3.6 ± 0.21

Second pre-dorsal length

SPrDL

4.2

6.1

4.9 ± 0.32

Pre-pectoral length

PrPL

2.2

3.4

2.6 ± 0.11

Pre-ventral length

PrVL

1.9

4.1

2.9 ± 0.14

Pre-anal length

PrAL

4.1

7.3

5.5 ± 0.47

Head length

HL

1.7

3.2

2.4 ± 0.09

Pre-orbital length

PrOL

0.4

0.7

0.5 ± 0.01

Orbital length

OL

0.7

1.1

0.8 ± 0.02

Post-orbital length

PsOL

0.6

1.4

0.9 ± 0.04

Meristic counts

 

Minimum

Maximum

Number of first dorsal fin ray

FDFR

7

8

Number of second dorsal fin ray

SDFR

23

24

Number of pectoral fin ray

PFR

21

22

Number of ventral fin ray

VFR

5

5

Number of anal fin ray

AFR

20

22

Number of ventral spine

VS

2

2

Fig. 3
Fig. 3

Length-weight relationships of razorbelly scad, Alepes kleinii (Bloch, 1793) collected from southern coast, Bangladesh

Systematics

Order: Perciformes (Bleeker, 1859).

Family: Carangidae (Rafinesque, 1815).

Genus: Alepes (Swainson, 1839).

Alepes kleinii (Bloch, 1793).

Common name: Razorbelly scad (English), Macarela bandoneada (Spanish).

Discussion

The minimum and maximum fork length (FL) of 29 recorded individuals was 7.5 cm and 13.5 cm respectively, although Alepes kleinii can grow to a maximum 16 cm in length (FL) (Smith-Vaniz, 1984).The regression parameter b of length weight relationship for Alepes kleinii (b = 2.81), was found to be within the expected normal range of 2.5 < b < 3.5, as compared with the Bayesian LWRs predictions approach in FishBase (Froese, 2006; Siddik et al. 2016b; Islam et al. 2017; Hanif et al. 2017a). This indicates that this species will grow more in weight than in length and the coastal waters of Bangladesh are conducive for supporting the growth and development of this species.

Species distribution is influenced by a large number of environmental factors such as the geological history of the area, environmental stability, ecosystem productivity, habitat heterogeneity and suitability, and competition and predation (Legalle et al. 2008; Alshawy et al. 2016). Several vectors including patterns of water circulation, currents, and sea warming may provide suitable conditions for the expansion of its distribution range (Gurlek et al. 2016). Although, it is not exact whether the Alepes kleinii is endemic to the coastal Bangladesh region, or a recent migrant into these waters, despite the nearest reported findings being Sri Lanka (Robins et al. 1991) and South-East India (Kapoor et al. 2002). The authors agree with the proposition of Mahapatro et al. (2017), that fish always seek better environmental conditions can lead to alterations in geographical distribution. Furthermore, frequent climatic changes and human interventions have worked altogether to distribute species in new areas far from their natural habitat (Hanif et al. 2017b). Since the species have extended distribution throughout the Indo-West Pacific region, there is a possibility of climate changes led to a rise in the sea surface areas could have caused the fish dispersed from their native range to the coast of Bangladesh.

Conclusion

According to the information collected through independent web-based search, the occurrence of razorbelly scad, Alepes kleinii is novel in the coastal region of Bangladesh. As the Alepes kleinii is within the same family as 37 other carangid species inhabiting southern Bangladesh, this particular fish has the potential to increase its range and adapt to the unique fisheries hotspot of southern coastal Bangladesh.

Abbreviations

AFR: 

Number of anal fin ray

BD: 

Body depth

CP: 

Caudal peduncle

FDFR: 

Number of first dorsal fin ray

FL: 

Fork length

FPrDL: 

First pre-dorsal length

HD: 

Head length

OL: 

Orbital length

PFR: 

Number of pectoral fin ray

PrAL: 

Pre-anal length

PrOL: 

Pre-orbital length

PrPL: 

Pre-pectoral length

PrVL: 

Pre-ventral length

PsOL: 

Post-orbital length

SD: 

Standard deviation

SDFR: 

Number of second dorsal fin ray

SL: 

Standard length

SPrDL: 

Second pre-dorsal length

TL: 

Total length

VFR: 

Number of ventral fin ray

VS: 

Number of ventral spine

Declarations

Acknowledgements

The authors are indebted to fishermen helped in collecting fish specimens. We also highly thankful to Regional Horticulture Research Centre (RHRC) for providing lab facilities.

Funding

The present study was supported through MS fellowship from the Ministry of Science and Technology (NST-2014-2015), Government of the people’s republic of Bangladesh.

Availability of data and materials

All data generated during the study are interpreted in the manuscript.

Authors’ contributions

MABS and MAH conceived of the study, carried out the identification of the specimens and drafted the manuscript. AN and MRC participated in its design, coordination and helped to drafted the manuscript, RK revised and finalised the manuscript. All authors read and approved the final manuscript.

Ethics approval and consent to participate

No specific ethical issues were required for the described study in Bangladesh.The sampling areas are not privately owned or protected and the study did not involve endangered or protected species.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Authors’ Affiliations

(1)
Department of Fisheries Biology and Genetics, Patuakhali Science and Technology University, Patuakhali, 8602, Bangladesh
(2)
Department of Marine Fisheries and Oceanography, Patuakhali Science and Technology University, Patuakhali, 8602, Bangladesh
(3)
Department of Environment and Agriculture, Curtin University, 1 Turner Avenue, Bentley, WA, 6102, Australia

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