Abundance and Length-weight Relationship of Anchovy Pekto

(Stolephorus waitei) in Tanjung Beringin Water, Serdang Bedagai,

Sumatera Utara

Miswar Budi Mulya

, Arlen Hanel Jhon

and Zulham Apandy Harahap

Department of Biology,

Faculty of Mathematics and Natural Sciences, Universitas Sumatera Utara, Medan, Indonesia

Faculty of Agriculture, Universitas Sumatera Utara, Medan, Indonesia

Keywords: Abundance, Distribution Pattern, Length-Weight Relationship.

Abstract: Research about the abundance and length-weight relationship of anchovy pekto (Stolephorus waitei) has

been carried out in Tanjung Beringin Water, Serdang Bedagai Regency, Sumatera Utara. This study aims to

analyze the abundance, distribution pattern, and length-weight relationship of anchovy pekto. This research

use purposive sampling methods. Sampling of anchovy pecto use a mini purse seine. Abundance and

distribution of anchovies were analyzed using the equation according to [1] and the length-weight

relationship using the Fish Stock Assessment Tool version 2. This study obtained 1238 ind/60 m

. The

highest abundance of anchovy at station 1 is 490 ind/60m

, followed by station 2 is 386 ind/60m

, and the

lowest at station 3 is 362 ind/60m

. The distribution pattern of anchovy pecto is group distribution. The

length-weight relationship of anchovy pekto showed that increase in anchovy body weight faster than its

length, which illustrates a positive allometric growth pattern, with a value of b > 3.

1 INTRODUCTION

Utilization of marine fishery resources is an

important issue, as a food and trade commodity,

including anchovy pecto (S. waitei). Anchovy pecto

is often found in Indonesia waters, including the

water of Tanjung Beringin, Serdang Bedagai

Regency, Sumatera Utara. Anchovy pecto is very

widely used by the community, both for sale and

consumption to meet protein needs. The high selling

price and market demand for this commodity has

caused many fishermen around the Tanjung

Beringin water of Serdang Bedagai Regency to catch

this commodity, without any restrictions. This

condition can affect population abundance and

growth of this commodities in nature. Until now,

there is no data on the abundance and growth of

anchovy in the Malacca Strait Waters of Serdang

Bedagai Regency, Sumatera Utara. This study aims

to analyze the abundance and length-weight

relationship of anchovy pekto.

2 ANCHOVY SAMPLING

Anchovy sampling was carried out in the waters of

Tanjung Beringin, Serdang Bedagai Regency, every

12 days for 7 months of observation. This research

use purposive sampling methods. Sampling of

anchovy pecto use a mini purse seine. Samples of

captured anchovies were collected, then measured

the total length from the anterior end to the posterior

end of the body using millimeter blocks to the

nearest 0.1 mm. Fresh weights of anchovies were

also measured per individual by weighing each

individual using a digital scale with an accuracy of

0.1 g, then an analysis of abundance, distribution,

and growth pattern.

Abundance of anchovy pecto were analyzed

using the equation according to Silaen and Mulya

(2018):

K (ind/m

) = n

with:

K = abundance (ind/m

)

= number of individuals spesies i

A = plot area (m

)

Mulya, M., Jhon, A. and Harahap, Z.

Abundance and Length-weight Relationship of Anchovy Pekto (Stolephorus waitei) in Tanjung Beringin Water, Serdang Bedagai, Sumatera Utara.

DOI: 10.5220/0010200400002775

In Proceedings of the 1st International MIPAnet Conference on Science and Mathematics (IMC-SciMath 2019), pages 435-437

ISBN: 978-989-758-556-2

435

Distribution patterns were analyzed based on the

Morisita Distribution Index (Bengen, 1998) with the

equation:



































nID

ID = Morisita distribution index

N = number of plots (ranging from 1 to n)

= total number of individuals in the total plot

x

= number of individual squares in the total

plot

Length-weight relationship using the Fish Stock

Assessment Tool version 2 according to Sparre and

Venema, (1998), with regretion equation:

W = a L

or Ln W = Ln a + bLn L,

W = wet weight (g)

L = total length (cm)

a and b = constans

2.1 Abundance

The abundance analysis of anchovy pecto can be

seen in Figure 1. This study obtained 1238 ind/60

. The highest abundance of anchovy at station 1 is

490 ind/60m

, followed by station 3 is 386 ind/60m

and the lowest at station 2 is 62 ind/60m

. High

abundance at station 1 is due to the fact that this

station is 15 km from the beach leading to the sea,

and is an anchovy catchment area. The water

temperature at this station is 28°C, and strongly

supports the life of this biota.

Figure 1: Abundance of anchovy pecto in each station.

Yuanda et al. (2017) stated that anchovy

generally lives in groups, the number reaches

hundreds individuals, and has a length of about 6-9

cm. Fitriani and Pursetyo, (2012) stated that the

anchovy pecto belongs to a group of small pelagic

fish that can live in a temperature range of 26⁰C-

29⁰C.

2.2 Distribution

The distribution of anchovy pecto at each station,

which was analyzed using the morisita distribution

index can be seen in Figure 2.

Figure 2: Distribution of anchovy pecto at each station.

The results of the distribution analysis of

anchovies get a distribution index value greater than

3 or Id > 3, which illustrates the distribution of

anchovies at each station, classified into the pattern

of group distribution. This can be seen from the

anchovy found at each station generally has a size

that is not much different and found always in

groups. Mulya and Harahap, (2019) stated that,

distribution criteria can be grouped into three groups

based on the value of the morista distribution index.

The distribution of a population is categorized

randomly, if it has a distribution index value (Id) =

1.00. The distribution of a population is categorized

as normal if it has a distribution index value (Id) = 0,

and the distribution of a population is categorized as

a group if it has a distribution index value (Id) ≠ 1 or

Id ≠ 0.

2.3 Growth Pattern

The results of the length-weight analysis of

anchovies obtained, it appears that the growth of

anchovy pecto at each station is a positive

allometric, with a value of b > 3 (Figure 3).

Figure 3: Growth pattern of anchovy pecto.

500

123

490

386

362

Abundance

(ind/60m

Station

123

21 21

Distribution index

Station

y = 0,0037x

3,4079

R² = 0,9026

02468

Weigth (g)

Length (cm)

IMC-SciMath 2019 - The International MIPAnet Conference on Science and Mathematics (IMC-SciMath)

436

The result of analysis show that equation: Log W

= 0,0037 + 3,4079 log L, or in exponential form: W

= 0,0037L

3,4079

with coefficient of determination

) = 0,8828. Mulya (2019) states that the growth is

said to be isometric, if the value of b = 3, whereas if

the value of b is greater or smaller than 3 then

growth is said to be allometric, assuming if the value

of b < 3 body length increases faster than weight

gain, whereas if the value of b > 3 increases weight

faster than increasing body length.

Some factors that cause positive allometric

growth are physiological and environmental

conditions, such as temperature, pH, salinity,

geographical location and sampling

technique (Mulfizar et al. 2012). The results also

found that anchovies at each station had a fat size.

3 CONCLUSIONS

1) The highest abundance of anchovy at station 1 is

490 ind/60m

, followed by station 3 is 386

ind/60m

, and the lowest at station 2 is 362

ind/60m

2) The distribution pattern of anchovy pecto is

group distribution.

3) The length-weight relationship of anchovy pekto

showed that increase in anchovy body weight

faster than its length, which illustrates a positive

allometric growth pattern, with a value of b > 3.

ACKNOWLEDGEMENT

Authors would like to express our gratitude to

DRPM for the financial support by PDUPT 2019

scheme.

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11.

Abundance and Length-weight Relationship of Anchovy Pekto (Stolephorus waitei) in Tanjung Beringin Water, Serdang Bedagai, Sumatera

Utara

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