Growth parameters of Poecilia latipinna (Lesueur, 1821) (Actinopterygii, Poeciilidae) – an introduced species in brackish water of Wadi Al-Bahayes (Oman)

This work is one of the first studies on the growth of Poecilia latipinna outside its natural habitat. The objective of our study was to investigate the growth parameters of the population of P. latipinna, which is an alien species in Oman (Wadi Al-Bahayes). The population structure of P. latipinna in Wadi Al-Bahayes (Oman; 23°40′47″N; 58°11′36″E) was studied in June and August 2020, using 124 fish. In the course of this study, the number of individuals of each sex, age, weight and size composition were determined. In addition, the total length–weight relationship (LRW) was calculated, as well as the von Bertalanffy growth equation. The mean growth performance (phi prime) and the condition factor were calculated. Males accounted for 37.10% and females for 62.90% of the population. The length–weight relationship and the von Bertalanffy growth equation were W = 0.0214 × L 2.7889 R2 = 0.9212, Lt = 11.46 (1 − e −0.127 (t + 2.71)) for males and Lt = 14.51 (1 − e−0.072 (t + 3.98)) for females. The mean growth performance and the condition factor were calculated as 1.22 for males and 1.18 for females and 1.54 for all specimens. The study shows that the population of the species is characterized by a wide age range. Consequently, monitoring of this alien species is highly recommended.

FIRST CONFIRMED RECORD OF AN ESTABLISHED POPULATION OF SAILFIN MOLLY, POECILIA LATIPINNA (ACTINOPTERYGII: CYPRINODONTIFORMES: POECILIIDAE), IN THE FRESHWATER AREAS OF OMAN, WITH DESCRIPTION OF AN IMPERFECT ALBINISM INCIDENCE

Among the ways that the alien can introduce to a new environment is the aquarium trade that became one of the major problem facing the existing of the native species worldwide. This study confirms the presence of an established non-native molly population in two inland water in Oman. The sailfin molly, Poecilia latipinna was positively identified using the number of scales around the caudal peduncle as the main pinpointing character within the sailfin molly species complex. The study also reports on the presence of imperfect melanism incidence in one specimen of P. latipinna collected from Al-Amarat area. The causative factor of this anomaly was discussed.

Karakteristik Kimiawi Tepung Ikan Molly, Poecilia latipinna (Lesueur 1821)

Penelitian ini bertujuan untuk menentukan kandungan gizi tepung ikan molly, P. latipinna (Lesueur 1821) sebagai bahan pakan ikan, udang dan ternak. Sampel ikan dibersihkan, dikeringkan di bawah sinar matahari selama 12 jam, diblender menjadi tepung selanjutnya diuji proksimat. Hasil analisis menunjukkan bahwa tepung ikan molly mengandung protein; lemak; serat kasar; abu, air secara berturut-turut sebagai berikut: 66,40%; 12,52%; 0,80%; 15,51% dan 3,70%; asam amino esensial yaitu: lisina 4,99%; leusina 4,27%; fenilalanina 2,64%; valina 2,63%; treonina 2,50%; dan histidina 1,49%. Asam lemak esensial terdiri dari kelompok asam lemak omega-3 yaitu: asam dekosakeksanoat (DHA) 0,09%; asam eikosapentanoat (EPA) 0,03% dan asam linolenat (HUFA) 0,21%. Kelompok asam lemak omega 6 terdiri atas asam linoleat (LA) 0,25% dan arakidonat (AA) 0,04%. Tepung ikan molly secara kuantitas dan kualitas sangat baik sebagai bahan pakan sumber protein, asam amino dan asam lemak esensial untuk pakan ikan, udang dan ternak.

Reproductive biology of sailfin molly, Poecilia latipinna (Lesueur, 1821) in tambak Bosowa Kabupaten Maros

Sailfin molly, Poecilia latipinna is one of the alien ornamental fishes in Indonesia. This fish has been found in the aquaculture area in Maros Regency, south Sulawesi as a pest. The research aimed to identify species and observe aspects of reproductive biology of sailfin molly. The study was conducted in the Bosowa Isuma aquaculture area, in Maros Regency from November 2017 to April 2018. Fish was captured using a gillnet. The catches were separated for fish identifying and reproductive biology purposes. For the observation of reproductive biology, the samples were separated by sex according to external morphology. Measurement of total length and weight using calliper (mm) and analytical scales (g), respectively. The gonads preserved in the 4% formalin solution, used for determination of gonad developmental stages and fecundity. Identification results showed that the molly fish found in the ponds was Poecilia latipinna (Lesueur 1821). The length distribution of male and female fish was 26-76 and 31-66 mm with a mean of 51 and 46 mm, respectively. Overall, sex ratio and mature gonads between male and female fish were 1: 2 and 1:10; the growth patterns of male and female were negative allometrics and isometric, respectively. This fish is spawn throughout the year with the peak of spawning in January. The number of larvae to be born (larval fecundity) ranges from 12-111 individuals with an average of ± 32 larva/female.