Optimized Live Feed Regime Significantly Improves Growth Performance and Survival Rate for Early Life History Stages of Pangasius Catfish (Pangasianodon hypophthalmus)

Abstract

<jats:p>This study aimed to determine the optimal live feed regime (i.e., initial feeding moment, density, and frequency) for maximum growth and survival of pangasius catfish (Pangasianodon hypophthalmus) early life history stages. The first experiment assessed the optimal initial feeding moment (30, 36, 42, and 48 h post hatching, hph). The second experiment assessed feeding density (3, 5, 8 and 11 individuals per mL, ind/mL) at the optimal initial feeding moment (30 hph) which was the best result from the first experiment. The third experiment assessed optimal feeding frequency (1, 2, 4, and 6 times per day) at the optimal initial feeding moment (30 hph) and density (8 ind/mL) which was drawn upon from the second experiment. All experiments were conducted in 20 L containers containing 20 hph P. hypophthalmus larvae at a density of 10 ind/L and fed rotifers (Brachionus angularis) for 3 days and then water fleas (Moina macrocopa) for 7 days. The first experiment demonstrated that larvae initially fed at 30 hph exhibited a significantly higher survival rate (24%) than larvae initially fed at 36, 42, and 48 hph (19%, 16%, and 16%), respectively. The second experiment demonstrated that larvae fed at 8 and 11 ind/mL densities exhibited significantly higher survival rates (32% and 32%) than larvae fed at 3 and 5 ind/mL densities (13% and 23%), respectively. The third experiment demonstrated that the highest survival rate (66%) was obtained when larvae were fed 6 times per day. These results provide valuable insights regarding the optimal live feed regime for better growth and survival of P. hypophthalmus larvae, which are commercially important and numerously cultured throughout the Mekong Delta region.</jats:p>

Growth Performance and Nutritional Condition of Marble Goby (Oxyeleotris marmoratus) Larvae Fed under Different Onsets of First Feeding

“…Period. First feeding time plays a crucial role in the overall growth performance of marble goby larvae, as is also the case for several freshwater fsh species such as the silver therapon (Leiopotherapon plumbeus) [16], the African catfsh [8], the silver catfsh [7], and the river catfsh (Pangasianodon hypophthalmus) [26]. Unlike marine fsh larvae, freshwater fsh are usually larger at hatching and have a larger yolk sac, which provides sufcient food and energy for various biological developments.…”

Comparison of Production Performance of Striped Catfish Larvae (Pangasianodon hypophthalmus) Fed With Live And Frozen Daphnia

“…The specific growth rate (length and weight) were calculated using the formula according to (Vu & Huynh, 2020) as follows:…”

ẢNH HƯỞNG CỦA THỜI ĐIỂM CHO ĂN LÊN SINH TRƯỞNG VÀ TỶ LỆ SỐNG CỦA CÁ KHOANG CỔ ĐỎ (Amphiprion frenatus Brevoort, 1856)

“…Thời điểm cho ăn thích hợp có sự khác biệt lớn giữa các loài. Trên các đối tượng đã nghiên cứu, khoảng thời gian này dao động từ một tới vài ngày, cụ thể là 30 -36 giờ đối với cá tra Pangasianodon hypophthalmus [23] và cá bống tượng Oxyeleotris marmorata [19]; 2 ngày với cá trạng nguyên vàng Siniperca scherzeri [10], cá mú cọp Epinephelus fuscoguttatus [24], cá chẽm Lates calcarifer [13]; 3 ngày với cá bơn California Paralichthys californicus [22]; 5 ngày với cá nóc Takifugu obscurus [25]; và 8 ngày với cá rô phi Oreochromis niloticus [26]. Như vậy, thời gian tiêu hóa hết noãn hoàng và thời điểm cung cấp thức ăn ở nhóm cá khoang cổ sớm hơn so với một số loài đã được nghiên cứu, trong vòng 12 giờ sau nở.…”