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CATFISH KECIL UNIK, Corydoras sp. UNTUK AKUARIUM, TINGKAH LAKU BIOLOGI DAN REPRODUKSINYA
Abstract
Corydoras sp. termasuk dalam familia Collichthyidae, kelas Siluridae dan sangat dikenal olah para hobiis ikan hias air tawar. Genus Corydoras yang berasal dari Amerika Selatan ini mempunyai banyak spesies tetapi yang banyak beredar dan sudah dibudidayakan ada 10 spesies yaitu C. aeneus, C. adolfoi, C. barbatus, C. paleatus, C. panda, C. pygmaeus, C. rabauti, C. septentrionalis, C. sterbai, dan C. sychri. Selain ukurannya yang umumnya kecil (maksimum 7,5 cm) dibandingkan dengan jenis catfish lain, jenis ini mempunyai dua baris sisik keras. Bentuk badannya kompak agak pipih ke samping dengan mulut menghadap ke bawah. Hidup merayap di dasar pada suhu 24°C--28°C (tergantung spesiesnya); pH 7,0--7,5; dan hardness sekitar 10° dH. Disebut “tukang bersih-bersih” karena senang membersihkan dinding akuarium dengan mulutnya. Tingkah laku reproduksinya amat unik. Sebelum ovulasi induk betina akan menempatkan mulutnya kearah genital induk jantan yang dikenal dengan “posisi T” dan akan mengisap spermanya. Sperma ini akan dilepas melewati usus bersama dengan lepasnya telur kedalam “kantong” yang dibentuk oleh kedua sirip perutnya. Pembuahan efektif terjadi di sini. Kemudian telur akan dilekatkan ke substrat atau objek (daun, batu datar, dan sebagainya) yang sebelumnya telah dibersihkan oleh induk jantannya. Telur yang ditinggalkan akan menetas di substrat bila kondisi airnya sesuai dan cukup baik.
... Corydoras fish is one of the ornamental fish from the catfish family origin come from South America, precisely Brazil to Argentina [1]. This fish has a variety of species, according to [2], there are 143 different species of corydoras in the world. ...
... One species of corydoras fish that has been widely cultured in Indonesia is Corydoras paleatus (Corydoras paleatus). Other corydoras fish species commonly cultured in Indonesia include C. sterbai, C. panda, C. albino, C. aeneus, and C. juli [1]. ...
... Egg count. C. paleatus eggs are collected every 08.00 hours because according to [10] and [1] Corridor fish finished spawning at 07.30. The eggs were collected in a coconut milk sieve with a diameter of 20 cm, then counted and transferred to an egg hatching container. ...
The sex ratio in spawning can affect the efficiency and success of hatchery activities because sex ratio in spawning affects the number of eggs, the degree of fertilization, and the degree of hatching of eggs. Until now, there is limited research conducted in Corydoras paleatus fish spawning thus this study aims to determine differences in the reproductive performance of C. paleatus with different male sex ratios. This study uses three treatments, which are the ratio of fish male and female (1:1), (2:1), and (3:1). Each treatment uses one female fish. The vessel used in fish spawning is an aquarium with a size of 50 × 25 × 30 cm3. Spawning lasts for seven days and eggs are collected every day at 08.00. The number of eggs and larvae produced was not significantly different between treatments. Larvae produced by C. paleatus were 2,154 fish or 538 fish per female per week. The ratio (1:1) was considered an appropriate ratio in spawning C. paleatus fish because it has a high efficiency value.
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