MARINE BAITFISH

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EXAMPLE OF <strong>MARINE</strong> <strong>BAITFISH</strong> CULTURE: PINFISH Pinfish spawn fall/winter offshore with a peak in February and March. They are sexually mature at ~4 inches (~100 mm) total length. Fecundity ranges from 7,000 to 90,000 eggs/female. Ambient temperature and light cycles during spawning season should be ~72°F (22°C), 12L:12D. Photothermal regimes may be altered for offcycling. Use water with a salinity of 35 g/L. Feed brood fish twice daily to satiation a combination of squid, krill, and a 2.0 mm slow sinking pellet. Examine for gamete development by abdominal palpation to check for flowing sperm or conduct an ovarian biopsy using a teflon catheter tube (Figure 1). Figure 1. Ovarian biopsy of a pinfish. At the time of injection, eggs should be > 500 µm and vitellogenic. Biopsies indicate pinfish exhibit multi-batch, group synchronous reproduction (Figure 2). Human Chorionic Gonadotropin (HCG, Chorulon®) can be used to induce spawning. Eggs are usually collected 48 and 72 hours after injection. A hydrated egg will be about 1 mm in diameter (Figure 3). (continued on next page) Figure 2. Pinfish exhibit multi-batch, group synchronous reproduction. Figure 3. A hydrated pinfish egg is 1 mm in diameter. 29
(example of marine baitfish culture cont.) The recommended larval feeding schedule is shown in Figure 4. The developmental stages of larval pinfish are shown in Figure 5. Figure 5. Pinfish at various stages of development. Juveniles can be cultured to market size of 3 inches in tanks in about 65 days (Figure 6). They should be fed 3-7% of biomass daily divided into two feedings of a 2.0 mm commercial diet. One tested stocking density was 120 fish/m3. Survival was very high at >99%. Culture in salinities as low as 9 g/L has been successful. Figure 6. Recirculating aquaculture systems used to grow juvenile pinfish to market size. 30
Page 1 and 2: growing MARINE BAITFISH A guide to
Page 3 and 4: CONTENTS 2 Croaker Micropogonias un
Page 5 and 6: CROAKER hardhead, chut, king billie
Page 7 and 8: (pinfish cont.) Range: Pinfish inha
Page 9 and 10: (killifish cont.) Aquaculture poten
Page 11 and 12: (pigfish cont.) Aquaculture potenti
Page 13 and 14: (striped mullet cont.) Aquaculture
Page 15 and 16: BALLYHOO balao, halfbeak, ‘hoo Fl
Page 17 and 18: (mojara cont.) mm) in length and be
Page 19 and 20: (round scad cont.) Range: Found onl
Page 21 and 22: ATLANTIC MENHADEN pogy, mossbunker,
Page 23 and 24: ATLANTIC THREADFIN threadfin herrin
Page 25 and 26: TOMTATE grunt, spot-tail, red mouth
Page 27 and 28: BAY ANCHOVY glass minnow, silversid
Page 29 and 30: (references cont.) Pigfish Oesterli
Page 31: (references cont.) Atlantic Threadf

MARINE BAITFISH

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