Spawning habitat of Telmatherina sarasinorum (Family: Telmatherinidae) in Lake Matano [Habitat pemijahan ikan Telmatherina sarasinorum (Famili: Telmatherinidae) di Danau Matano]


Jusri Nilawati, nFN Sulistiono, Djadja S. Sjafei, M. F. Rahardjo, Ismudi Muchsin
 DOI  https://doi.org/10.32491/jii.v10i2.161

Abstract

A study on habitat of Telmatherina sarasinorum was conducted in Lake Matano. An underwater observation on the fish habitat was performed to allow description on habitat while investigating its reproductive behaviour. There were two types of spawning habitat on the fish observed. The first was shallow beach with flat contour and bottom covered by cobble and little sand in between which was located in littoral area with trees on the lake sides. The second was deeper water with steeper bottom which has hanging down roots and fallen down stems and twigs of any trees covered by alga. In the two habitats the fish prefers shading places provided by any trees existing on the lake sides as spawning sites. The fish was not observed spawn in places covered by dense cobbles and open waters exposed directly to sunlight. Such a habitat specialist becomes important factor needed to be taken into account in the attempts to conserve the fish and its habitat in Lake Matano. Maintaining the existence of spawning habitat through protecting the presence of terrestrial vegetation surrounding the lake is important key for conservation of the fish and its habitat.

 

Abstrak

Penelitian tentang habitat Telmatherina sarasinorum dilakukan di Danau Matano. Pengamatan bawah air pada habitat ikan ini dilakukan untuk membuat gambaran mengenai habitat sambil meneliti tingkah laku reproduksinya. Ada dua tipe habitat pemijahan ikan yang diamati. Pertama adalah pantai dangkal dengan kontur datar dan dasar ditutupi oleh kerikil dan sedikit pasir diantaranya yang terletak di daerah litoral dengan pohon-pohon di pinggiran danau. Kedua adalah perairan dalam dengan dasar lebih curam yang mempunyai akar-akar menggantung serta batang dan ranting pohon tumbang yang diselimuti oleh alga. Pada kedua tipe habitat tersebut ikan menyukai tempat-tempat teduh yang mendapat bayang-bayang dari pohon yang ada di pinggiran danau sebagai tempat pemijahan. Ikan diamati tidak memijah di tempat-tempat yang ditutupi oleh kerikil yang padat dan perairan terbuka yang terpapar langsung oleh cahaya matahari. Habitat khusus demikian merupakan faktor penting yang perlu dipertimbangkan dalam usaha konservasi ikan dan habitatnya di Danau Matano. Pemeliharaan habitat pemijahan melalui perlindungan keberadaan vegetasi terestrial di sekeliling danau adalah kunci penting untuk konservasi ikan dan habitatnya.


Keywords

habitat preference; Lake Matano; spawning arena; spawning substrate; Telmatherina sarasinorum.

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